commit 70d239fe9c7ece1ab1b632ffd7b3bcb915bde830
Author: Damian Kellenberger <kellenberger.damian@gmail.com>
Date:   Tue Sep 8 22:59:37 2026 +0200

    Begehbare 3D-Visualisierung des Gartens Egglihaldenstrasse 9a
    
    Geometrie massstaeblich aus dem Gartenplan-PDF (1:100) extrahiert: Belaege,
    Mauern, Pflanzenstandorte und 46 Hoehenkoten. Wohnhaus nach Gartenplan und
    den Fassadenplaenen von EHLE Architekten.
    
    - tools/: Pipeline PDF -> Szenenmodell (MuPDF, Node)
    - src/: three.js-Szene mit prozeduralen Texturen, Rundgang und Uebersicht
    - Docker/Traefik fuer garten.aicds.ch, Gitea-Workflow auf main
    
    Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

diff --git a/.claude/launch.json b/.claude/launch.json
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--- /dev/null
+++ b/.claude/launch.json
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+{
+  "version": "0.0.1",
+  "configurations": [
+    {
+      "name": "garten-dev",
+      "runtimeExecutable": "npm",
+      "runtimeArgs": ["run", "dev"],
+      "port": 5173
+    }
+  ]
+}
diff --git a/.dockerignore b/.dockerignore
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--- /dev/null
+++ b/.dockerignore
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+node_modules
+dist
+.git
+.gitea
+.claude
+tools/out
+Info Dateien
+docs
+*.md
+.claude-launch-static.mjs
diff --git a/.gitea/workflows/deploy.yaml b/.gitea/workflows/deploy.yaml
new file mode 100644
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+++ b/.gitea/workflows/deploy.yaml
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+name: Deploy App
+on:
+  push:
+    branches:
+      - main
+jobs:
+  deploy:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout Code
+        uses: actions/checkout@v4
+      - name: Deploy to Server
+        run: |
+          APP_DIR="/opt/aicds/apps/${GITHUB_REPOSITORY#*/}"
+          mkdir -p $APP_DIR
+          cp -a . $APP_DIR/
+          cd $APP_DIR
+          docker compose down || true
+          docker compose up -d --build
+          docker image prune -f
diff --git a/.gitignore b/.gitignore
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--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,5 @@
+node_modules/
+dist/
+tools/out/
+.claude-launch-static.mjs
+*.log
diff --git a/Dockerfile b/Dockerfile
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--- /dev/null
+++ b/Dockerfile
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+# --- Build ------------------------------------------------------------------
+FROM node:22-alpine AS build
+WORKDIR /app
+
+COPY package.json package-lock.json ./
+RUN npm ci
+
+COPY tsconfig.json vite.config.ts index.html ./
+COPY src ./src
+COPY public ./public
+RUN npm run build
+
+# --- Laufzeit ---------------------------------------------------------------
+FROM nginx:1.27-alpine
+COPY nginx.conf /etc/nginx/conf.d/default.conf
+COPY --from=build /app/dist /usr/share/nginx/html
+EXPOSE 80
+HEALTHCHECK --interval=30s --timeout=3s --start-period=5s \
+  CMD wget -qO- http://localhost/ >/dev/null || exit 1
diff --git a/Info Dateien/20210427 - Projektpläne Haus 9a.pdf b/Info Dateien/20210427 - Projektpläne Haus 9a.pdf
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diff --git a/README.md b/README.md
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+++ b/README.md
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+# Gartenvisualisierung Egglihaldenstrasse 9a
+
+Begehbare 3D-Visualisierung des geplanten Gartens von Jasmin und Damian
+Kellenberger, Egglihaldenstrasse 9a, 9030 Abtwil SG.
+
+Live: **https://garten.aicds.ch**
+
+Die gesamte Geometrie ist **massstäblich aus dem Gartenplan** abgeleitet – nicht
+nachmodelliert. Ein Node-Werkzeug liest die Vektordaten direkt aus dem Plan-PDF,
+rechnet sie in Meter um und erzeugt daraus das Szenenmodell.
+
+---
+
+## Grundlagen
+
+| Quelle | Inhalt |
+|---|---|
+| `Info Dateien/Gartenplan 1 …pdf` | Garten Design AG, 14.08.2026, Massstab 1:100, A1 |
+| `Info Dateien/20210427 - Projektpläne Haus 9a.pdf` | EHLE Architekten AG, Grundrisse, Fassaden, Umgebung |
+| `Info Dateien/WhatsApp Image …jpeg` | Fotos des Ist-Zustands (Fassade, Beläge, Nachbarschaft) |
+
+Die DWG wird nicht benötigt – das PDF enthält dieselbe Vektorgeometrie.
+
+### Koordinatensystem
+
+Alles rechnet im **Site-Frame**, in Metern:
+
+- **X** – Hausachse ENE, Peilung 61.1615° gegen Nord
+- **Z** – senkrecht dazu, SSE, Peilung 151.1615°
+- **Y** – Höhe über dem Fixpunkt `0.00` = **651.17 m ü. M.** (OK Fertigboden EG)
+
+Der Nordpfeil des Plans zeigt exakt zur Blattoberkante, das Zeichnungsraster
+liegt um −28.8385° gedreht dazu. Der Massstab ist über das Plattenraster
+verifiziert: die Keramikplatten messen sich auf 0.600 m genau.
+
+### Höhen
+
+| Bezug | relativ | absolut |
+|---|---|---|
+| Feuerwehrzufahrt, Nordwestecke | −2.08 | 648.09 m |
+| Nachbargarten Zollet (Haus 9, OK FB EG) | −1.70 | 649.47 m |
+| Hauptsitzplatz Travertin | −0.30 … −0.02 | 650.87 … 651.15 m |
+| Fixpunkt Hauseingang | 0.00 | 651.17 m |
+| Ostseite beim Apfelbaum | +0.63 | 651.80 m |
+| OK Fertigboden Obergeschoss | +2.90 | 654.07 m |
+| OK Attika Haus 9a | +6.15 | 657.32 m |
+
+---
+
+## Datenpipeline
+
+```bash
+npm run data       # extract-plan + build-site
+```
+
+1. **`tools/extract-plan.mjs`** – öffnet das Plan-PDF mit MuPDF (WASM) und
+   protokolliert alle Zeichenoperationen mit. Ergebnis: rund 5400 Polygone,
+   234 Pflanzenkreise, 229 Beschriftungen und 46 Höhenkoten, transformiert in
+   den Site-Frame. → `tools/out/plan-raw.json`
+
+2. **`tools/authoring.mjs`** – handgepflegte Ergänzungen: Zuordnung der
+   Planfarben zu Belagsarten, Mauerachsen und -höhen, Gebäudekubatur,
+   Geländezonen, Standorte. Alles kommentiert und auf Plan oder
+   Architekturpläne zurückgeführt.
+
+3. **`tools/build-site.mjs`** – klassiert die Flächen, leitet Pflanzen und
+   Leuchten ab, interpoliert das Geländeraster (0.25 m) aus den Höhenkoten je
+   Zone und schreibt `public/data/site.json` (rund 110 kB).
+
+Zur Kontrolle: `node tools/debug-svg.mjs` zeichnet die extrahierte Geometrie als
+SVG-Draufsicht, `node tools/inspect-colors.mjs` listet die Planfarben mit den
+nächstgelegenen Beschriftungen.
+
+### Warum Zonen statt eines einzigen Geländes
+
+Das Grundstück fällt über rund 3.5 m ab, die Sprünge liegen aber nicht im
+Gelände, sondern in den Stützbauten: Travertinmauer zum Nachbargrundstück,
+Winkelelemente aus Beton entlang der Feuerwehrzufahrt, Betonmauer im Süden.
+Deshalb wird je Zone getrennt interpoliert – über die Zonengrenze hinweg nie.
+Die Mauern erhalten ihr Kronen- und Fussprofil aus dem Gelände beider Seiten.
+
+---
+
+## Anwendung
+
+```bash
+npm install
+npm run dev        # http://localhost:5173
+npm run build      # dist/, rund 640 kB
+```
+
+Stack: Vite + TypeScript + three.js. **Keine externen Assets** – sämtliche
+Texturen (Travertin, Keramik, Tegula, Rasen, Kies, Beton, Holzschalung,
+Scheiterwand) werden zur Laufzeit prozedural auf ein Canvas gezeichnet. Die UVs
+sind weltbezogen, damit die Plattenraster über Flächengrenzen hinweg durchlaufen
+– so wie auf dem Plan.
+
+### Bedienung
+
+| | |
+|---|---|
+| Rundgang | Klicken, dann `W` `A` `S` `D`, `Shift` zum Rennen, `Esc` gibt die Maus frei |
+| Handy | links Joystick, rechts wischen zum Umsehen |
+| Übersicht | ziehen zum Drehen, Mausrad zum Zoomen |
+| Tageszeit | Regler oben rechts, Sonnenstand astronomisch für Abtwil SG gerechnet |
+
+Der Rundgang folgt dem Gelände, steigt Stufen bis 45 cm und wird von Mauern,
+Gebäuden, Hecken und Objekten aufgehalten. Ab Dämmerung schalten die 17 Leuchten
+des Plans automatisch ein.
+
+### Aufbau
+
+```
+src/
+  site.ts                 Datenmodell und Höhen-Sampler
+  scene/textures.ts       prozedurale Beläge und Materialien
+  scene/geometry.ts       Polygone auf das Gelände legen, Mauern extrudieren
+  scene/terrain.ts        Geländeraster und Umland
+  scene/surfaces.ts       Beläge
+  scene/structures.ts     Mauern, Stelen, Objekte, Leuchten
+  scene/vegetation.ts     Gehölze, Hecken, Gräser, Stauden
+  scene/building.ts       Wohnhaus 9a und Nachbargebäude
+  scene/environment.ts    Himmel, Sonnenstand, Licht
+  controls/walker.ts      Begehen mit Kollision und Geländeführung
+  ui/hud.ts               Bedienoberfläche
+```
+
+---
+
+## Deployment
+
+Push auf `main` löst den Gitea-Workflow aus; die App landet unter
+`/opt/aicds/apps/Gartenvisualisierung/` und wird per `docker compose` gebaut.
+Traefik-Router `garten`, Host `garten.aicds.ch`, Netzwerk `agent-net`.
+
+```bash
+docker compose config     # Prüfung vor dem Push
+docker compose up -d --build
+```
+
+Das Image enthält nur `dist/` hinter nginx – die Planunterlagen und Fotos aus
+`Info Dateien/` werden über `.dockerignore` ausgeschlossen und gelangen nie in
+den Webcontainer.
+
+---
+
+## Was bewusst interpretiert ist
+
+Der Plan ist ein Situationsplan; einiges steht nur als Beschriftung darin. Diese
+Annahmen stecken in `tools/authoring.mjs` und sind dort einzeln kommentiert:
+
+- **Mauerhöhen** aus den Höhenkoten beidseits abgeleitet; die gelbe Kote `25`
+  bei der Sitzmauer als 25 cm Aufkantung gelesen, `35` bei den Heidelbeeren
+  analog.
+- **Lamellenwand zum Sitzen** als senkrechte Holzlamellen im Planrhythmus
+  (10 cm breit, 35 cm tief, rund 90 cm Achsabstand), passend zum Foto des
+  Ist-Zustands.
+- **Wohnhaus** in Kubatur und Öffnungen nach Gartenplan und Fassadenplänen,
+  Materialisierung nach den Fotos: vertikale Holzschalung graubraun, heller
+  Betonsockel, Flachdach mit extensiver Begrünung.
+- **Nachbarhaus Zollet** als einfaches Kontextvolumen, 1.70 m tiefer liegend.
+- **Solitärgehölze** mit den Kronenradien des Plans; Wuchshöhen als
+  Erfahrungswerte.
+- **Gartenhaus, Spielhaus, Flammengrill, Bänkli** in Lage und Grundfläche nach
+  Plan, in der Ausformulierung frei.
diff --git a/docker-compose.yml b/docker-compose.yml
new file mode 100644
index 0000000..caad123
--- /dev/null
+++ b/docker-compose.yml
@@ -0,0 +1,16 @@
+services:
+  app:
+    build: .
+    restart: unless-stopped
+    networks:
+      - agent-net
+    labels:
+      - "traefik.enable=true"
+      - "traefik.http.routers.garten.rule=Host(`garten.aicds.ch`)"
+      - "traefik.http.routers.garten.entrypoints=websecure"
+      - "traefik.http.routers.garten.tls.certresolver=myresolver"
+      - "traefik.http.services.garten.loadbalancer.server.port=80"
+
+networks:
+  agent-net:
+    external: true
diff --git a/index.html b/index.html
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--- /dev/null
+++ b/index.html
@@ -0,0 +1,65 @@
+<!doctype html>
+<html lang="de-CH">
+  <head>
+    <meta charset="utf-8" />
+    <meta name="viewport" content="width=device-width, initial-scale=1, viewport-fit=cover, user-scalable=no" />
+    <meta name="theme-color" content="#2c3a2a" />
+    <meta name="description" content="Begehbare 3D-Visualisierung des geplanten Gartens an der Egglihaldenstrasse 9a in Abtwil, massstäblich aus dem Gartenplan der Garten Design AG." />
+    <title>Garten Egglihaldenstrasse 9a &middot; 3D-Visualisierung</title>
+    <link rel="icon" href="data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 32 32'%3E%3Ctext y='26' font-size='26'%3E%F0%9F%8C%B3%3C/text%3E%3C/svg%3E" />
+  </head>
+  <body>
+    <canvas id="view"></canvas>
+
+    <div id="loader">
+      <div class="loader-inner">
+        <div class="loader-title">Garten Egglihaldenstrasse 9a</div>
+        <div class="loader-bar"><span id="loader-fill"></span></div>
+        <div class="loader-note" id="loader-note">Gartenplan wird aufgebaut …</div>
+      </div>
+    </div>
+
+    <div id="hud" hidden>
+      <header id="topbar">
+        <div class="brand">
+          <strong>Garten Egglihaldenstrasse&nbsp;9a</strong>
+          <span>Abtwil SG &middot; Gartenplan 1, Garten Design AG</span>
+        </div>
+        <div class="topbar-actions">
+          <button id="btn-mode" type="button" title="Zwischen Rundgang und Übersicht wechseln">Übersicht</button>
+          <button id="btn-info" type="button" title="Informationen zum Plan">Info</button>
+        </div>
+      </header>
+
+      <nav id="views" aria-label="Standorte"></nav>
+
+      <div id="timebar">
+        <label for="time">Tageszeit <output id="time-out">14:00</output></label>
+        <input id="time" type="range" min="4" max="23" step="0.25" value="14" />
+        <label for="season">Datum <output id="season-out">21. Juni</output></label>
+        <input id="season" type="range" min="1" max="365" step="1" value="172" />
+      </div>
+
+      <div id="crosshair"></div>
+
+      <div id="hint">
+        <span class="desktop">Klicken zum Umsehen &middot; <kbd>W</kbd><kbd>A</kbd><kbd>S</kbd><kbd>D</kbd> gehen &middot; <kbd>Shift</kbd> schneller &middot; <kbd>Esc</kbd> Maus freigeben</span>
+        <span class="touch">Links ziehen zum Gehen &middot; rechts wischen zum Umsehen</span>
+      </div>
+
+      <div id="joystick" hidden><div id="joystick-knob"></div></div>
+
+      <aside id="info" hidden>
+        <button id="info-close" type="button" aria-label="Schliessen">&times;</button>
+        <h2>Über diese Visualisierung</h2>
+        <div id="info-body"></div>
+      </aside>
+    </div>
+
+    <noscript>
+      <p style="padding:2rem;font:16px system-ui">Für die 3D-Visualisierung wird JavaScript benötigt.</p>
+    </noscript>
+
+    <script type="module" src="/src/main.ts"></script>
+  </body>
+</html>
diff --git a/nginx.conf b/nginx.conf
new file mode 100644
index 0000000..d4a10e9
--- /dev/null
+++ b/nginx.conf
@@ -0,0 +1,26 @@
+server {
+    listen 80;
+    server_name _;
+    root /usr/share/nginx/html;
+    index index.html;
+
+    gzip on;
+    gzip_types text/css application/javascript application/json image/svg+xml;
+    gzip_min_length 1024;
+
+    # Statische Assets tragen einen Hash im Namen und duerfen lange liegenbleiben.
+    location /assets/ {
+        expires 1y;
+        add_header Cache-Control "public, immutable";
+    }
+
+    # Das Szenenmodell wird bei jedem Plan-Update neu gebaut.
+    location /data/ {
+        expires 1h;
+        add_header Cache-Control "public";
+    }
+
+    location / {
+        try_files $uri $uri/ /index.html;
+    }
+}
diff --git a/package-lock.json b/package-lock.json
new file mode 100644
index 0000000..edf3523
--- /dev/null
+++ b/package-lock.json
@@ -0,0 +1,1254 @@
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+  "name": "gartenvisualisierung",
+  "version": "0.1.0",
+  "lockfileVersion": 3,
+  "requires": true,
+  "packages": {
+    "": {
+      "name": "gartenvisualisierung",
+      "version": "0.1.0",
+      "dependencies": {
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+      },
+      "devDependencies": {
+        "@types/three": "^0.172.0",
+        "mupdf": "^1.28.1",
+        "typescript": "^5.7.3",
+        "vite": "^6.0.11"
+      }
+    },
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+        "arm64"
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+      "dev": true,
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+      "os": [
+        "darwin"
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diff --git a/package.json b/package.json
new file mode 100644
index 0000000..13d7a87
--- /dev/null
+++ b/package.json
@@ -0,0 +1,27 @@
+{
+  "name": "gartenvisualisierung",
+  "version": "0.1.0",
+  "private": true,
+  "type": "module",
+  "description": "Begehbare 3D-Visualisierung des Gartens Kellenberger, Egglihaldenstrasse 9a, 9030 Abtwil",
+  "scripts": {
+    "extract": "node tools/extract-plan.mjs",
+    "build:site": "node tools/build-site.mjs",
+    "data": "npm run extract && npm run build:site",
+    "dev": "vite",
+    "build": "tsc --noEmit && vite build",
+    "preview": "vite preview --port 4173"
+  },
+  "devDependencies": {
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+    "mupdf": "^1.28.1",
+    "typescript": "^5.7.3",
+    "vite": "^6.0.11"
+  },
+  "dependencies": {
+    "three": "^0.172.0"
+  },
+  "allowScripts": {
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+  }
+}
diff --git a/public/data/site.json b/public/data/site.json
new file mode 100644
index 0000000..0702f2f
--- /dev/null
+++ b/public/data/site.json
@@ -0,0 +1 @@
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\ No newline at end of file
diff --git a/src/controls/walker.ts b/src/controls/walker.ts
new file mode 100644
index 0000000..e54e503
--- /dev/null
+++ b/src/controls/walker.ts
@@ -0,0 +1,225 @@
+/**
+ * Begehen des Gartens: Maus/Tastatur am Desktop, Joystick und Wischen am Handy.
+ * Der Spieler folgt dem Gelaende, kann Stufen bis 45 cm ersteigen und wird
+ * von Mauern, Gebaeuden und Objekten aufgehalten.
+ */
+import { Euler, PerspectiveCamera, Vector3 } from 'three';
+
+/** Achsenausgerichtetes oder gedrehtes Hindernis in der Draufsicht. */
+export interface Obstacle {
+  cx: number;
+  cz: number;
+  hw: number;
+  hd: number;
+  /** Drehung um Y in Radiant. */
+  rot: number;
+  /** Hindernisse unterhalb dieser Hoehe kann man uebersteigen. */
+  climbable?: boolean;
+}
+
+export interface WalkerOptions {
+  height: (x: number, z: number) => number;
+  obstacles: Obstacle[];
+  bounds: { x0: number; z0: number; x1: number; z1: number };
+  eyeHeight?: number;
+  radius?: number;
+  maxStep?: number;
+}
+
+const SPEED_WALK = 1.65;
+const SPEED_RUN = 3.6;
+
+export class Walker {
+  readonly camera: PerspectiveCamera;
+  private readonly opts: Required<WalkerOptions>;
+  private readonly euler = new Euler(0, 0, 0, 'YXZ');
+  private readonly keys = new Set<string>();
+  private readonly pos = new Vector3();
+  private velocityY = 0;
+  private grounded = true;
+  private joystick = { x: 0, y: 0, active: false };
+  private lookDelta = { x: 0, y: 0 };
+  private pointerLocked = false;
+  private enabled = true;
+
+  /** Wird gesetzt, wenn der Nutzer die Maus gefangen hat oder wieder frei ist. */
+  onPointerLockChange?: (locked: boolean) => void;
+
+  constructor(camera: PerspectiveCamera, options: WalkerOptions) {
+    this.camera = camera;
+    this.opts = {
+      eyeHeight: 1.68,
+      radius: 0.32,
+      maxStep: 0.45,
+      ...options,
+    } as Required<WalkerOptions>;
+  }
+
+  get position(): Vector3 { return this.pos; }
+  get yawDegrees(): number { return (this.euler.y * 180) / Math.PI; }
+
+  setEnabled(on: boolean) { this.enabled = on; }
+
+  teleport(x: number, z: number, yawDeg: number) {
+    this.pos.set(x, this.opts.height(x, z) + this.opts.eyeHeight, z);
+    this.euler.set(0, (-yawDeg * Math.PI) / 180, 0);
+    this.velocityY = 0;
+    this.applyCamera();
+  }
+
+  // -- Eingaben -------------------------------------------------------------
+
+  attach(dom: HTMLElement) {
+    window.addEventListener('keydown', (e) => {
+      if (e.code === 'Tab') return;
+      this.keys.add(e.code);
+      if (['ArrowUp', 'ArrowDown', 'ArrowLeft', 'ArrowRight', 'Space'].includes(e.code)) e.preventDefault();
+    });
+    window.addEventListener('keyup', (e) => this.keys.delete(e.code));
+    window.addEventListener('blur', () => this.keys.clear());
+
+    dom.addEventListener('click', () => {
+      if (!this.enabled || this.pointerLocked || isTouch()) return;
+      // In eingebetteten Vorschauen ist Pointer Lock gesperrt - kein Grund abzustuerzen.
+      Promise.resolve(dom.requestPointerLock()).catch(() => {});
+    });
+    document.addEventListener('pointerlockchange', () => {
+      this.pointerLocked = document.pointerLockElement === dom;
+      this.onPointerLockChange?.(this.pointerLocked);
+    });
+    document.addEventListener('mousemove', (e) => {
+      if (!this.pointerLocked || !this.enabled) return;
+      this.lookDelta.x -= e.movementX * 0.0022;
+      this.lookDelta.y -= e.movementY * 0.0022;
+    });
+
+    // Wischen zum Umsehen (rechte Bildschirmhaelfte bleibt fuer den Blick frei)
+    let touchId: number | null = null;
+    let last = { x: 0, y: 0 };
+    dom.addEventListener('touchstart', (e) => {
+      for (const t of Array.from(e.changedTouches)) {
+        if (touchId === null && t.clientX > window.innerWidth * 0.35) {
+          touchId = t.identifier;
+          last = { x: t.clientX, y: t.clientY };
+        }
+      }
+    }, { passive: true });
+    dom.addEventListener('touchmove', (e) => {
+      for (const t of Array.from(e.changedTouches)) {
+        if (t.identifier !== touchId) continue;
+        this.lookDelta.x -= (t.clientX - last.x) * 0.005;
+        this.lookDelta.y -= (t.clientY - last.y) * 0.005;
+        last = { x: t.clientX, y: t.clientY };
+      }
+    }, { passive: true });
+    const end = (e: TouchEvent) => {
+      for (const t of Array.from(e.changedTouches)) if (t.identifier === touchId) touchId = null;
+    };
+    dom.addEventListener('touchend', end, { passive: true });
+    dom.addEventListener('touchcancel', end, { passive: true });
+  }
+
+  setJoystick(x: number, y: number, active: boolean) {
+    this.joystick = { x, y, active };
+  }
+
+  // -- Bewegung -------------------------------------------------------------
+
+  update(dt: number) {
+    if (!this.enabled) return;
+
+    this.euler.y += this.lookDelta.x;
+    this.euler.x += this.lookDelta.y;
+    this.euler.x = Math.max(-1.4, Math.min(1.4, this.euler.x));
+    this.lookDelta.x = 0;
+    this.lookDelta.y = 0;
+
+    let forward = 0, strafe = 0;
+    if (this.keys.has('KeyW') || this.keys.has('ArrowUp')) forward += 1;
+    if (this.keys.has('KeyS') || this.keys.has('ArrowDown')) forward -= 1;
+    if (this.keys.has('KeyD') || this.keys.has('ArrowRight')) strafe += 1;
+    if (this.keys.has('KeyA') || this.keys.has('ArrowLeft')) strafe -= 1;
+    if (this.joystick.active) {
+      forward += -this.joystick.y;
+      strafe += this.joystick.x;
+    }
+
+    const len = Math.hypot(forward, strafe);
+    if (len > 1) { forward /= len; strafe /= len; }
+
+    const running = this.keys.has('ShiftLeft') || this.keys.has('ShiftRight');
+    const speed = (running ? SPEED_RUN : SPEED_WALK) * dt;
+    const sin = Math.sin(this.euler.y), cos = Math.cos(this.euler.y);
+    const dx = (-sin * forward + cos * strafe) * speed;
+    const dz = (-cos * forward - sin * strafe) * speed;
+
+    this.move(dx, dz);
+
+    // Vertikal: dem Gelaende folgen, Absaetze weich abfangen
+    const ground = this.opts.height(this.pos.x, this.pos.z) + this.opts.eyeHeight;
+    if (this.pos.y > ground + 0.02) {
+      this.velocityY -= 9.81 * dt;
+      this.pos.y += this.velocityY * dt;
+      if (this.pos.y <= ground) { this.pos.y = ground; this.velocityY = 0; this.grounded = true; }
+      else this.grounded = false;
+    } else {
+      // sanftes Nachziehen beim Aufsteigen
+      this.pos.y += (ground - this.pos.y) * Math.min(1, dt * 12);
+      this.velocityY = 0;
+      this.grounded = true;
+    }
+
+    this.applyCamera();
+  }
+
+  /** Bewegt den Spieler und loest Kollisionen achsenweise auf. */
+  private move(dx: number, dz: number) {
+    const tryAxis = (nx: number, nz: number): boolean => {
+      const y0 = this.opts.height(this.pos.x, this.pos.z);
+      const y1 = this.opts.height(nx, nz);
+      if (this.grounded && y1 - y0 > this.opts.maxStep) return false;
+      if (this.blocked(nx, nz)) return false;
+      const b = this.opts.bounds;
+      if (nx < b.x0 || nx > b.x1 || nz < b.z0 || nz > b.z1) return false;
+      this.pos.x = nx;
+      this.pos.z = nz;
+      return true;
+    };
+    if (dx !== 0) tryAxis(this.pos.x + dx, this.pos.z);
+    if (dz !== 0) tryAxis(this.pos.x, this.pos.z + dz);
+  }
+
+  private blocked(x: number, z: number): boolean {
+    const r = this.opts.radius;
+    for (const o of this.opts.obstacles) {
+      const dx = x - o.cx, dz = z - o.cz;
+      const c = Math.cos(-o.rot), s = Math.sin(-o.rot);
+      const lx = dx * c - dz * s;
+      const lz = dx * s + dz * c;
+      if (Math.abs(lx) < o.hw + r && Math.abs(lz) < o.hd + r) return true;
+    }
+    return false;
+  }
+
+  private applyCamera() {
+    this.camera.position.copy(this.pos);
+    this.camera.quaternion.setFromEuler(this.euler);
+  }
+}
+
+export function isTouch(): boolean {
+  return window.matchMedia('(pointer: coarse)').matches;
+}
+
+/** Baut ein Hindernis aus einer Strecke (Mauer) mit gegebener Dicke. */
+export function obstacleFromSegment(a: [number, number], b: [number, number], thickness: number): Obstacle {
+  const dx = b[0] - a[0], dz = b[1] - a[1];
+  const len = Math.hypot(dx, dz);
+  return {
+    cx: (a[0] + b[0]) / 2,
+    cz: (a[1] + b[1]) / 2,
+    hw: len / 2,
+    hd: thickness / 2,
+    rot: Math.atan2(dz, dx),
+  };
+}
diff --git a/src/main.ts b/src/main.ts
new file mode 100644
index 0000000..eadba86
--- /dev/null
+++ b/src/main.ts
@@ -0,0 +1,241 @@
+/**
+ * Begehbare 3D-Visualisierung des Gartens Egglihaldenstrasse 9a, Abtwil SG.
+ *
+ * Die gesamte Geometrie ist massstaeblich aus dem Gartenplan 1 der
+ * Garten Design AG (1:100) abgeleitet; das Wohnhaus zusaetzlich aus den
+ * Projektplaenen von EHLE Architekten. Siehe tools/ fuer die Datenpipeline.
+ */
+import {
+  ACESFilmicToneMapping, Group, PCFSoftShadowMap, PerspectiveCamera, Scene,
+  SRGBColorSpace, Vector3, WebGLRenderer,
+} from 'three';
+import './style.css';
+import { loadSite, makeHeightSampler, type SiteData } from './site';
+import { buildTerrain } from './scene/terrain';
+import { buildSurfaces } from './scene/surfaces';
+import { buildWalls, buildStelen, buildProps, buildLamps } from './scene/structures';
+import { buildVegetation } from './scene/vegetation';
+import { buildBuilding, buildNeighbourBuildings } from './scene/building';
+import { buildEnvironment } from './scene/environment';
+import { Walker, isTouch, obstacleFromSegment, type Obstacle } from './controls/walker';
+import { setupHud } from './ui/hud';
+
+const CENTER: [number, number] = [-9.5, -1.0];
+const BOUNDS = { x0: -24.0, z0: -12.5, x1: 7.5, z1: 8.5 };
+
+async function main() {
+  const canvas = document.getElementById('view') as HTMLCanvasElement;
+  const fill = document.getElementById('loader-fill') as HTMLSpanElement;
+  const note = document.getElementById('loader-note') as HTMLDivElement;
+  const progress = (pct: number, text: string) => {
+    fill.style.width = `${pct}%`;
+    note.textContent = text;
+    return new Promise<void>((r) => requestAnimationFrame(() => r()));
+  };
+
+  const renderer = new WebGLRenderer({ canvas, antialias: true, powerPreference: 'high-performance' });
+  renderer.setPixelRatio(Math.min(devicePixelRatio, 2));
+  renderer.outputColorSpace = SRGBColorSpace;
+  renderer.toneMapping = ACESFilmicToneMapping;
+  renderer.toneMappingExposure = 0.94;
+  renderer.shadowMap.enabled = true;
+  renderer.shadowMap.type = PCFSoftShadowMap;
+
+  const scene = new Scene();
+  const camera = new PerspectiveCamera(62, 1, 0.08, 1400);
+
+  await progress(8, 'Gartenplan wird geladen …');
+  const site: SiteData = await loadSite();
+  const height = makeHeightSampler(site.terrain);
+
+  await progress(22, 'Gelände wird modelliert …');
+  scene.add(buildTerrain(site.terrain));
+
+  await progress(38, 'Beläge werden verlegt …');
+  scene.add(buildSurfaces(site.surfaces, height));
+
+  await progress(52, 'Mauern und Bauteile …');
+  scene.add(buildWalls(site.walls, height));
+  scene.add(buildStelen(site.stelen, height));
+  scene.add(buildProps(site.props, height));
+
+  await progress(66, 'Haus und Nachbarschaft …');
+  scene.add(buildBuilding(site.building));
+  scene.add(buildNeighbourBuildings(site.neighbourBuildings));
+
+  await progress(80, 'Bepflanzung wird gesetzt …');
+  scene.add(buildVegetation(site.plants, site.trees, height));
+
+  await progress(90, 'Licht und Himmel …');
+  const lamps = buildLamps(site.lamps, height);
+  scene.add(lamps.group);
+  const env = buildEnvironment(scene, {
+    lat: site.meta.location.lat,
+    lon: site.meta.location.lon,
+    northBearingOfSiteX: site.meta.location.northBearingOfSiteX,
+    center: CENTER,
+    radius: 26,
+  });
+  scene.add(env.group);
+
+  // -- Hindernisse fuer den Rundgang --------------------------------------
+  const obstacles: Obstacle[] = [];
+  const b = site.building;
+  const [bx0, bz0] = b.outline[0];
+  const bx1 = b.outline[1][0];
+  const bz1 = b.outline[2][1];
+  // Baukoerper ohne die begehbare Loggia: zwei Rechtecke
+  obstacles.push({
+    cx: (bx0 + bx1) / 2, cz: (bz0 + b.loggia.z0) / 2,
+    hw: (bx1 - bx0) / 2, hd: (b.loggia.z0 - bz0) / 2, rot: 0,
+  });
+  obstacles.push({
+    cx: (b.loggia.x1 + bx1) / 2, cz: (b.loggia.z0 + bz1) / 2,
+    hw: (bx1 - b.loggia.x1) / 2, hd: (bz1 - b.loggia.z0) / 2, rot: 0,
+  });
+  for (const nb of site.neighbourBuildings) {
+    let x0 = Infinity, z0 = Infinity, x1 = -Infinity, z1 = -Infinity;
+    for (const [x, z] of nb.outline) { x0 = Math.min(x0, x); x1 = Math.max(x1, x); z0 = Math.min(z0, z); z1 = Math.max(z1, z); }
+    obstacles.push({ cx: (x0 + x1) / 2, cz: (z0 + z1) / 2, hw: (x1 - x0) / 2, hd: (z1 - z0) / 2, rot: 0 });
+  }
+  for (const w of site.walls) {
+    for (let i = 1; i < w.path.length; i++) {
+      obstacles.push(obstacleFromSegment(w.path[i - 1], w.path[i], w.t + 0.1));
+    }
+  }
+  for (const p of site.props) {
+    if (p.type === 'schacht' || p.type === 'wasserhahn') continue;
+    obstacles.push({ cx: p.x, cz: p.z, hw: p.w / 2, hd: p.d / 2, rot: (p.rot * Math.PI) / 180 });
+  }
+  for (const pl of site.plants) {
+    if (pl.type !== 'hecke' || !pl.polygon) continue;
+    let x0 = Infinity, z0 = Infinity, x1 = -Infinity, z1 = -Infinity;
+    for (const [x, z] of pl.polygon) { x0 = Math.min(x0, x); x1 = Math.max(x1, x); z0 = Math.min(z0, z); z1 = Math.max(z1, z); }
+    obstacles.push({ cx: (x0 + x1) / 2, cz: (z0 + z1) / 2, hw: (x1 - x0) / 2, hd: (z1 - z0) / 2, rot: 0 });
+  }
+  for (const t of site.trees) {
+    obstacles.push({ cx: t.x, cz: t.z, hw: 0.22, hd: 0.22, rot: 0 });
+  }
+
+  const walker = new Walker(camera, { height, obstacles, bounds: BOUNDS });
+  walker.attach(canvas);
+  const start = site.startViews[0];
+  walker.teleport(start.x, start.z, start.yaw);
+
+  // -- Uebersichtsmodus ----------------------------------------------------
+  const orbit = {
+    active: false,
+    yaw: -0.7,
+    pitch: 0.72,
+    distance: 42,
+    target: new Vector3(CENTER[0], 0.5, CENTER[1]),
+    apply() {
+      const cp = Math.cos(this.pitch), sp = Math.sin(this.pitch);
+      camera.position.set(
+        this.target.x + this.distance * cp * Math.sin(this.yaw),
+        this.target.y + this.distance * sp,
+        this.target.z + this.distance * cp * Math.cos(this.yaw),
+      );
+      camera.lookAt(this.target);
+    },
+  };
+
+  let dragging = false;
+  let lastPointer = { x: 0, y: 0 };
+  canvas.addEventListener('pointerdown', (e) => {
+    if (!orbit.active) return;
+    dragging = true;
+    lastPointer = { x: e.clientX, y: e.clientY };
+    canvas.setPointerCapture(e.pointerId);
+  });
+  canvas.addEventListener('pointermove', (e) => {
+    if (!orbit.active || !dragging) return;
+    orbit.yaw -= (e.clientX - lastPointer.x) * 0.006;
+    orbit.pitch = Math.max(0.12, Math.min(1.45, orbit.pitch + (e.clientY - lastPointer.y) * 0.004));
+    lastPointer = { x: e.clientX, y: e.clientY };
+    orbit.apply();
+  });
+  canvas.addEventListener('pointerup', () => { dragging = false; });
+  canvas.addEventListener('wheel', (e) => {
+    if (!orbit.active) return;
+    e.preventDefault();
+    orbit.distance = Math.max(14, Math.min(110, orbit.distance * (1 + Math.sign(e.deltaY) * 0.12)));
+    orbit.apply();
+  }, { passive: false });
+
+  // -- Bedienoberflaeche ---------------------------------------------------
+  const hud = setupHud({
+    site,
+    onView: (v) => {
+      if (orbit.active) hud.setMode('walk');
+      walker.teleport(v.x, v.z, v.yaw);
+    },
+    onMode: (mode) => {
+      orbit.active = mode === 'overview';
+      walker.setEnabled(!orbit.active);
+      if (orbit.active) {
+        if (document.pointerLockElement) document.exitPointerLock();
+        orbit.apply();
+      } else {
+        walker.teleport(walker.position.x, walker.position.z, walker.yawDegrees);
+      }
+      canvas.style.cursor = orbit.active ? 'grab' : 'default';
+    },
+    onJoystick: (x, y, active) => walker.setJoystick(x, y, active),
+  });
+  walker.onPointerLockChange = (locked) => hud.setPointerLocked(locked);
+
+  // -- Renderschleife ------------------------------------------------------
+  function resize() {
+    const w = canvas.clientWidth || window.innerWidth;
+    const h = canvas.clientHeight || window.innerHeight;
+    renderer.setSize(w, h, false);
+    camera.aspect = w / h;
+    camera.updateProjectionMatrix();
+  }
+  window.addEventListener('resize', resize);
+  resize();
+
+  let last = performance.now();
+  let lastSun = { hours: -1, day: -1 };
+
+  function frame(now: number) {
+    const dt = Math.min(0.05, (now - last) / 1000);
+    last = now;
+
+    const t = hud.time();
+    if (t.hours !== lastSun.hours || t.day !== lastSun.day) {
+      const sun = env.update(t.day, t.hours);
+      lamps.setOn(env.isDark());
+      hud.setSunReadout(sun);
+      lastSun = t;
+    }
+
+    if (orbit.active) {
+      orbit.apply();
+    } else {
+      walker.update(dt);
+    }
+
+    renderer.render(scene, camera);
+    requestAnimationFrame(frame);
+  }
+
+  await progress(100, 'Bereit.');
+  document.getElementById('loader')!.classList.add('done');
+  document.getElementById('hud')!.hidden = false;
+  if (isTouch()) document.getElementById('joystick')!.hidden = false;
+  requestAnimationFrame(frame);
+
+  // Zugriff fuer Entwicklung und automatisierte Bildkontrolle
+  (window as unknown as { garten: unknown }).garten = {
+    scene, camera, site, env, walker, orbit, hud, renderer, Group,
+    setOverview(on: boolean) { hud.setMode(on ? 'overview' : 'walk'); },
+  };
+}
+
+main().catch((err) => {
+  console.error(err);
+  const note = document.getElementById('loader-note');
+  if (note) note.textContent = `Fehler beim Laden: ${(err as Error).message}`;
+});
diff --git a/src/scene/building.ts b/src/scene/building.ts
new file mode 100644
index 0000000..cf38666
--- /dev/null
+++ b/src/scene/building.ts
@@ -0,0 +1,273 @@
+/**
+ * Wohnhaus 9a und Nachbargebaeude.
+ *
+ * Grundriss und Oeffnungen stammen aus dem Gartenplan, die Hoehen aus den
+ * Fassadenplaenen 1:100 von EHLE Architekten (OK FB EG 651.17 = 0.00,
+ * OK FB OG +2.90, OK Attika +6.15). Materialisierung nach den Fotos:
+ * vertikale, offene Holzschalung graubraun auf hellem Betonsockel,
+ * dunkelbronzene Fensterrahmen, Flachdach mit extensiver Begruenung.
+ */
+import {
+  BufferAttribute, BufferGeometry, Group, Mesh, MeshPhysicalMaterial,
+  MeshStandardMaterial, PlaneGeometry,
+} from 'three';
+import type { Building, NeighbourBuilding, Opening, Vec2 } from '../site';
+import { boxGeometry, mergeGeometries } from './geometry';
+import * as tex from './textures';
+
+/** Rechteck in Fassadenkoordinaten (u entlang der Wand, y in der Hoehe). */
+interface Rect { u0: number; u1: number; y0: number; y1: number }
+
+/**
+ * Zieht Aussparungen von einem Wandfeld ab und liefert die verbleibenden
+ * Rechtecke. Erst in u-Richtung aufteilen, dann je Streifen in y-Richtung.
+ */
+function subtract(panel: Rect, voids: Rect[]): Rect[] {
+  const relevant = voids.filter((v) => v.u1 > panel.u0 && v.u0 < panel.u1 && v.y1 > panel.y0 && v.y0 < panel.y1);
+  if (!relevant.length) return [panel];
+
+  const cuts = new Set<number>([panel.u0, panel.u1]);
+  for (const v of relevant) {
+    if (v.u0 > panel.u0 && v.u0 < panel.u1) cuts.add(v.u0);
+    if (v.u1 > panel.u0 && v.u1 < panel.u1) cuts.add(v.u1);
+  }
+  const us = [...cuts].sort((a, b) => a - b);
+
+  const out: Rect[] = [];
+  for (let i = 0; i < us.length - 1; i++) {
+    const u0 = us[i], u1 = us[i + 1];
+    if (u1 - u0 < 1e-4) continue;
+    const mid = (u0 + u1) / 2;
+    const bands = relevant
+      .filter((v) => v.u0 <= mid && v.u1 >= mid)
+      .map((v) => [Math.max(panel.y0, v.y0), Math.min(panel.y1, v.y1)] as [number, number])
+      .sort((a, b) => a[0] - b[0]);
+    let y = panel.y0;
+    for (const [b0, b1] of bands) {
+      if (b0 > y) out.push({ u0, u1, y0: y, y1: b0 });
+      y = Math.max(y, b1);
+    }
+    if (y < panel.y1) out.push({ u0, u1, y0: y, y1: panel.y1 });
+  }
+  return out.filter((r) => r.u1 - r.u0 > 1e-4 && r.y1 - r.y0 > 1e-4);
+}
+
+/** Erzeugt die Quads einer Fassadenebene aus Rechtecken in (u, y). */
+function faceGeometry(
+  rects: Rect[],
+  toWorld: (u: number, y: number) => [number, number, number],
+  flip: boolean,
+  tile: number,
+): BufferGeometry {
+  const pos: number[] = [];
+  const uv: number[] = [];
+  for (const r of rects) {
+    const a = toWorld(r.u0, r.y0), b = toWorld(r.u1, r.y0);
+    const c = toWorld(r.u1, r.y1), d = toWorld(r.u0, r.y1);
+    const quad = flip ? [a, d, c, a, c, b] : [a, b, c, a, c, d];
+    const uvs = flip
+      ? [[r.u0, r.y0], [r.u0, r.y1], [r.u1, r.y1], [r.u0, r.y0], [r.u1, r.y1], [r.u1, r.y0]]
+      : [[r.u0, r.y0], [r.u1, r.y0], [r.u1, r.y1], [r.u0, r.y0], [r.u1, r.y1], [r.u0, r.y1]];
+    for (const p of quad) pos.push(p[0], p[1], p[2]);
+    for (const [u, y] of uvs) uv.push(u / tile, y / tile);
+  }
+  const g = new BufferGeometry();
+  g.setAttribute('position', new BufferAttribute(new Float32Array(pos), 3));
+  g.setAttribute('uv', new BufferAttribute(new Float32Array(uv), 2));
+  g.computeVertexNormals();
+  return g;
+}
+
+function glassMaterial() {
+  return new MeshPhysicalMaterial({
+    color: 0x1d2a2e, roughness: 0.06, metalness: 0.1,
+    transmission: 0, opacity: 0.72, transparent: true,
+    reflectivity: 0.85, envMapIntensity: 1.2, side: 2,
+  });
+}
+
+const FRAME = () => new MeshStandardMaterial({ color: 0x4a3f34, roughness: 0.45, metalness: 0.35 });
+
+export function buildBuilding(b: Building): Group {
+  const group = new Group();
+  group.name = b.name;
+
+  const holz = tex.fassadeHolz();
+  const holzMat = new MeshStandardMaterial({ map: holz.map, roughness: holz.roughness, metalness: 0 });
+  const sockelTex = tex.sockel();
+  const sockelMat = new MeshStandardMaterial({ map: sockelTex.map, roughness: sockelTex.roughness });
+  const glasMat = glassMaterial();
+  const frameMat = FRAME();
+
+  const [x0, z0] = b.outline[0];
+  const [x1] = b.outline[1];
+  const z1 = b.outline[2][1];
+  const yTop = b.roofLevel;
+  const SOCKEL = 0.35;   // heller Betonsockel unter der Holzschalung
+
+  /** Definition der vier Fassaden: u laeuft jeweils in Site-X bzw. Site-Z. */
+  const faces = {
+    north: { u0: x0, u1: x1, toWorld: (u: number, y: number) => [u, y, z0] as [number, number, number], flip: true },
+    south: { u0: x0, u1: x1, toWorld: (u: number, y: number) => [u, y, z1] as [number, number, number], flip: false },
+    west: { u0: z0, u1: z1, toWorld: (u: number, y: number) => [x0, y, u] as [number, number, number], flip: false },
+    east: { u0: z0, u1: z1, toWorld: (u: number, y: number) => [x1, y, u] as [number, number, number], flip: true },
+  };
+
+  // Aussparungen je Fassade: Fenster, Tueren und der offene Loggia-Bereich
+  const voidsFor = (face: Opening['face']): Rect[] => {
+    const list: Rect[] = b.openings
+      .filter((o) => o.face === face)
+      .map((o) => ({ u0: Math.min(o.a, o.b), u1: Math.max(o.a, o.b), y0: o.sill, y1: o.head }));
+    if (face === 'south') list.push({ u0: b.loggia.x0, u1: b.loggia.x1, y0: b.floorLevel - 0.4, y1: b.loggia.ceiling });
+    if (face === 'west') list.push({ u0: b.loggia.z0, u1: b.loggia.z1, y0: b.floorLevel - 0.4, y1: b.loggia.ceiling });
+    return list;
+  };
+
+  const holzParts: BufferGeometry[] = [];
+  const sockelParts: BufferGeometry[] = [];
+  for (const key of ['north', 'south', 'west', 'east'] as const) {
+    const f = faces[key];
+    const voids = voidsFor(key);
+    const sockelRects = subtract({ u0: f.u0, u1: f.u1, y0: b.floorLevel - 0.55, y1: b.floorLevel + SOCKEL }, voids);
+    const holzRects = subtract({ u0: f.u0, u1: f.u1, y0: b.floorLevel + SOCKEL, y1: yTop }, voids);
+    sockelParts.push(faceGeometry(sockelRects, f.toWorld, f.flip, sockelTex.tile));
+    holzParts.push(faceGeometry(holzRects, f.toWorld, f.flip, holz.tile));
+  }
+  const wallMesh = new Mesh(mergeGeometries(holzParts), holzMat);
+  wallMesh.name = 'Fassade';
+  wallMesh.castShadow = true;
+  wallMesh.receiveShadow = true;
+  group.add(wallMesh);
+
+  const sockelMesh = new Mesh(mergeGeometries(sockelParts), sockelMat);
+  sockelMesh.name = 'Sockel';
+  sockelMesh.castShadow = true;
+  sockelMesh.receiveShadow = true;
+  group.add(sockelMesh);
+
+  // --- Loggia: Innenwaende, Decke und Boden -------------------------------
+  const lg = b.loggia;
+  const loggia = new Group();
+  loggia.name = 'Gedeckter Sitzplatz';
+  const inner = new Mesh(
+    boxGeometry(lg.x1, (lg.z0 + lg.z1) / 2, 0.16, lg.z1 - lg.z0, b.floorLevel - 0.4, lg.ceiling, 0, holz.tile),
+    holzMat,
+  );
+  loggia.add(inner);
+  const back = new Mesh(
+    boxGeometry((lg.x0 + lg.x1) / 2, lg.z0, lg.x1 - lg.x0, 0.16, b.floorLevel - 0.4, lg.ceiling, 0, holz.tile),
+    holzMat,
+  );
+  loggia.add(back);
+  const ceil = new PlaneGeometry(lg.x1 - lg.x0, lg.z1 - lg.z0);
+  ceil.rotateX(Math.PI / 2);
+  const ceilMesh = new Mesh(ceil, new MeshStandardMaterial({ color: 0xd8d4cc, roughness: 0.85 }));
+  ceilMesh.position.set((lg.x0 + lg.x1) / 2, lg.ceiling, (lg.z0 + lg.z1) / 2);
+  loggia.add(ceilMesh);
+  loggia.children.forEach((c) => { (c as Mesh).castShadow = true; (c as Mesh).receiveShadow = true; });
+  group.add(loggia);
+
+  // --- Verglasungen und Rahmen -------------------------------------------
+  const glassGroup = new Group();
+  glassGroup.name = 'Verglasungen';
+  for (const o of b.openings) {
+    const f = faces[o.face];
+    const u0 = Math.min(o.a, o.b), u1 = Math.max(o.a, o.b);
+    const inset = 0.10;
+    const mid = (p: [number, number, number]): [number, number, number] => {
+      const n: [number, number, number] = [...p];
+      if (o.face === 'north') n[2] += inset;
+      if (o.face === 'south') n[2] -= inset;
+      if (o.face === 'west') n[0] += inset;
+      if (o.face === 'east') n[0] -= inset;
+      return n;
+    };
+    const rect: Rect = { u0, u1, y0: o.sill, y1: o.head };
+    const paneMat = o.kind === 'door'
+      ? new MeshStandardMaterial({ color: 0x6b4a30, roughness: 0.55 })
+      : o.kind === 'slats'
+        ? new MeshStandardMaterial({ color: 0x24211d, roughness: 0.7 })
+        : glasMat;
+    const pane = new Mesh(faceGeometry([rect], (u, y) => mid(f.toWorld(u, y)), f.flip, 1), paneMat);
+    pane.name = `Öffnung ${o.face} ${u0.toFixed(1)}`;
+    glassGroup.add(pane);
+
+    // Laibungsrahmen
+    const border = 0.07;
+    const frameRects: Rect[] = [
+      { u0, u1, y0: o.sill - border, y1: o.sill },
+      { u0, u1, y0: o.head, y1: o.head + border },
+      { u0: u0 - border, u1: u0, y0: o.sill - border, y1: o.head + border },
+      { u0: u1, u1: u1 + border, y0: o.sill - border, y1: o.head + border },
+    ];
+    const frame = new Mesh(faceGeometry(frameRects, (u, y) => mid(f.toWorld(u, y)), f.flip, 1), frameMat);
+    glassGroup.add(frame);
+  }
+  group.add(glassGroup);
+
+  // --- Flachdach mit Attika und Begruenung --------------------------------
+  const roof = new Group();
+  roof.name = 'Dach';
+  const gruen = tex.gruendach();
+  const roofPlane = new PlaneGeometry(x1 - x0 - 0.3, z1 - z0 - 0.3);
+  roofPlane.rotateX(-Math.PI / 2);
+  const ru = roofPlane.getAttribute('uv') as BufferAttribute;
+  for (let i = 0; i < ru.count; i++) ru.setXY(i, ru.getX(i) * ((x1 - x0) / gruen.tile), ru.getY(i) * ((z1 - z0) / gruen.tile));
+  const roofMesh = new Mesh(roofPlane, new MeshStandardMaterial({ map: gruen.map, roughness: 1 }));
+  roofMesh.position.set((x0 + x1) / 2, yTop - 0.05, (z0 + z1) / 2);
+  roofMesh.receiveShadow = true;
+  roof.add(roofMesh);
+
+  const attikaMat = new MeshStandardMaterial({ color: 0x8b8377, roughness: 0.7, metalness: 0.15 });
+  const attikaPath: Vec2[] = [[x0, z0], [x1, z0], [x1, z1], [x0, z1]];
+  for (let i = 0; i < 4; i++) {
+    const a = attikaPath[i], c = attikaPath[(i + 1) % 4];
+    const cx = (a[0] + c[0]) / 2, cz = (a[1] + c[1]) / 2;
+    const w = Math.abs(c[0] - a[0]) || 0.16;
+    const d = Math.abs(c[1] - a[1]) || 0.16;
+    const m = new Mesh(boxGeometry(cx, cz, w + 0.16, d + 0.16, yTop, yTop + b.parapet, 0, 2), attikaMat);
+    m.castShadow = true;
+    roof.add(m);
+  }
+  group.add(roof);
+
+  // --- Vordach ueber dem Eingang -----------------------------------------
+  const cp = b.canopy;
+  const canopy = new Mesh(
+    boxGeometry((cp.a + cp.b) / 2, z0 - cp.depth / 2, cp.b - cp.a, cp.depth, cp.y, cp.y + cp.thickness, 0, 2),
+    new MeshStandardMaterial({ color: 0x5a5148, roughness: 0.6 }),
+  );
+  canopy.name = 'Vordach Eingang';
+  canopy.castShadow = true;
+  group.add(canopy);
+
+  return group;
+}
+
+export function buildNeighbourBuildings(list: NeighbourBuilding[]): Group {
+  const group = new Group();
+  group.name = 'Nachbargebäude';
+  const holz = tex.fassadeHolz();
+  const mat = new MeshStandardMaterial({ map: holz.map, roughness: holz.roughness });
+  const attika = new MeshStandardMaterial({ color: 0x8b8377, roughness: 0.7 });
+
+  for (const b of list) {
+    let x0 = Infinity, z0 = Infinity, x1 = -Infinity, z1 = -Infinity;
+    for (const [x, z] of b.outline) { x0 = Math.min(x0, x); x1 = Math.max(x1, x); z0 = Math.min(z0, z); z1 = Math.max(z1, z); }
+    const body = new Mesh(
+      boxGeometry((x0 + x1) / 2, (z0 + z1) / 2, x1 - x0, z1 - z0, b.floorLevel - 0.8, b.roofLevel, 0, holz.tile),
+      mat,
+    );
+    body.name = b.name;
+    body.castShadow = true;
+    body.receiveShadow = true;
+    group.add(body);
+    const cap = new Mesh(
+      boxGeometry((x0 + x1) / 2, (z0 + z1) / 2, x1 - x0 + 0.2, z1 - z0 + 0.2, b.roofLevel, b.roofLevel + 0.3, 0, 2),
+      attika,
+    );
+    cap.castShadow = true;
+    group.add(cap);
+  }
+  return group;
+}
diff --git a/src/scene/environment.ts b/src/scene/environment.ts
new file mode 100644
index 0000000..9bf3ba6
--- /dev/null
+++ b/src/scene/environment.ts
@@ -0,0 +1,188 @@
+/**
+ * Himmel, Sonnenstand und Beleuchtung.
+ *
+ * Der Sonnenstand wird fuer den tatsaechlichen Standort gerechnet
+ * (Abtwil SG, 47.42 N / 9.29 O) und in den Site-Frame gedreht, dessen
+ * X-Achse mit 61.16 Grad gegen Nord verlaeuft.
+ */
+import {
+  AmbientLight, BackSide, Color, DirectionalLight, Fog, Group, HemisphereLight,
+  Mesh, ShaderMaterial, SphereGeometry, Scene, Vector3,
+} from 'three';
+
+export interface SunState {
+  /** Hoehenwinkel in Grad, negativ wenn die Sonne unter dem Horizont steht. */
+  altitude: number;
+  /** Azimut in Grad, von Nord im Uhrzeigersinn. */
+  azimuth: number;
+  /** Richtung zur Sonne im Site-Frame. */
+  direction: Vector3;
+}
+
+const RAD = Math.PI / 180;
+
+/**
+ * Sonnenstand nach dem vereinfachten NOAA-Verfahren.
+ * `date` als Tag im Jahr (1..365), `hours` als lokale Uhrzeit in Stunden.
+ */
+export function sunPosition(
+  dayOfYear: number, hours: number, lat: number, lon: number, utcOffset: number, northBearingOfSiteX: number,
+): SunState {
+  const gamma = ((2 * Math.PI) / 365) * (dayOfYear - 1 + (hours - 12) / 24);
+  const eqTime = 229.18 * (
+    0.000075 + 0.001868 * Math.cos(gamma) - 0.032077 * Math.sin(gamma) -
+    0.014615 * Math.cos(2 * gamma) - 0.040849 * Math.sin(2 * gamma)
+  );
+  const decl =
+    0.006918 - 0.399912 * Math.cos(gamma) + 0.070257 * Math.sin(gamma) -
+    0.006758 * Math.cos(2 * gamma) + 0.000907 * Math.sin(2 * gamma) -
+    0.002697 * Math.cos(3 * gamma) + 0.00148 * Math.sin(3 * gamma);
+
+  const timeOffset = eqTime + 4 * lon - 60 * utcOffset;
+  const trueSolarTime = (hours * 60 + timeOffset + 1440) % 1440;
+  const hourAngle = (trueSolarTime / 4 - 180) * RAD;
+  const latR = lat * RAD;
+
+  const cosZenith =
+    Math.sin(latR) * Math.sin(decl) + Math.cos(latR) * Math.cos(decl) * Math.cos(hourAngle);
+  const zenith = Math.acos(Math.max(-1, Math.min(1, cosZenith)));
+  const altitude = 90 - zenith / RAD;
+
+  let azimuth = Math.atan2(
+    -Math.sin(hourAngle),
+    Math.tan(decl) * Math.cos(latR) - Math.sin(latR) * Math.cos(hourAngle),
+  ) / RAD;
+  azimuth = (azimuth + 360) % 360;
+
+  const altR = altitude * RAD;
+  const bx = (azimuth - northBearingOfSiteX) * RAD;
+  const bz = (azimuth - (northBearingOfSiteX + 90)) * RAD;
+  const direction = new Vector3(
+    Math.cos(altR) * Math.cos(bx),
+    Math.sin(altR),
+    Math.cos(altR) * Math.cos(bz),
+  ).normalize();
+
+  return { altitude, azimuth, direction };
+}
+
+const SKY_VERT = /* glsl */ `
+  varying vec3 vWorld;
+  void main() {
+    vWorld = (modelMatrix * vec4(position, 1.0)).xyz;
+    gl_Position = projectionMatrix * modelViewMatrix * vec4(position, 1.0);
+  }
+`;
+
+const SKY_FRAG = /* glsl */ `
+  uniform vec3 uZenith;
+  uniform vec3 uHorizon;
+  uniform vec3 uGround;
+  uniform vec3 uSun;
+  uniform float uSunIntensity;
+  varying vec3 vWorld;
+
+  void main() {
+    vec3 dir = normalize(vWorld);
+    float h = dir.y;
+    vec3 sky = mix(uHorizon, uZenith, pow(clamp(h, 0.0, 1.0), 0.55));
+    sky = mix(uGround, sky, smoothstep(-0.10, 0.02, h));
+    float d = max(dot(dir, normalize(uSun)), 0.0);
+    sky += uSunIntensity * (pow(d, 900.0) * 6.0 + pow(d, 12.0) * 0.30 + pow(d, 3.0) * 0.06);
+    gl_FragColor = vec4(sky, 1.0);
+  }
+`;
+
+export interface Environment {
+  group: Group;
+  sun: DirectionalLight;
+  /** Setzt Tageszeit und Jahreszeit; liefert den berechneten Sonnenstand. */
+  update(dayOfYear: number, hours: number): SunState;
+  /** true, sobald die Gartenbeleuchtung eingeschaltet werden soll. */
+  isDark(): boolean;
+}
+
+export function buildEnvironment(scene: Scene, opts: {
+  lat: number; lon: number; northBearingOfSiteX: number; center: [number, number]; radius: number;
+}): Environment {
+  const group = new Group();
+  group.name = 'Umgebung';
+
+  const skyMat = new ShaderMaterial({
+    uniforms: {
+      uZenith: { value: new Color(0x2f6fc4) },
+      uHorizon: { value: new Color(0xbcd6ea) },
+      uGround: { value: new Color(0x6f7a63) },
+      uSun: { value: new Vector3(0, 1, 0) },
+      uSunIntensity: { value: 1 },
+    },
+    vertexShader: SKY_VERT,
+    fragmentShader: SKY_FRAG,
+    side: BackSide,
+    depthWrite: false,
+  });
+  const sky = new Mesh(new SphereGeometry(900, 32, 20), skyMat);
+  sky.name = 'Himmel';
+  group.add(sky);
+
+  const sun = new DirectionalLight(0xfff3e0, 2.6);
+  sun.castShadow = true;
+  sun.shadow.mapSize.set(2048, 2048);
+  const r = opts.radius;
+  const cam = sun.shadow.camera;
+  cam.left = -r; cam.right = r; cam.top = r; cam.bottom = -r;
+  cam.near = 1; cam.far = r * 6;
+  sun.shadow.bias = -0.0006;
+  sun.shadow.normalBias = 0.03;
+  sun.target.position.set(opts.center[0], 0, opts.center[1]);
+  group.add(sun, sun.target);
+
+  const hemi = new HemisphereLight(0xcfe3f5, 0x6b6a52, 1.0);
+  group.add(hemi);
+  const ambient = new AmbientLight(0xffffff, 0.30);
+  group.add(ambient);
+
+  scene.fog = new Fog(0xc4d6e6, 90, 620);
+
+  let dark = false;
+
+  function update(dayOfYear: number, hours: number): SunState {
+    // Sommerzeit grob: Ende Maerz bis Ende Oktober
+    const utcOffset = dayOfYear > 86 && dayOfYear < 303 ? 2 : 1;
+    const s = sunPosition(dayOfYear, hours, opts.lat, opts.lon, utcOffset, opts.northBearingOfSiteX);
+
+    const dist = r * 3;
+    sun.position.set(
+      opts.center[0] + s.direction.x * dist,
+      Math.max(2, s.direction.y * dist),
+      opts.center[1] + s.direction.z * dist,
+    );
+
+    // Tageslichtkurve: 0 bei Sonnenuntergang, 1 im Zenit
+    const day = Math.max(0, Math.min(1, (s.altitude + 4) / 34));
+    const dusk = Math.max(0, Math.min(1, (s.altitude + 8) / 14));
+    dark = s.altitude < 2;
+
+    const warm = 1 - dusk;
+    sun.intensity = 3.1 * day;
+    sun.color.setRGB(1, 0.95 - warm * 0.24, 0.86 - warm * 0.44);
+    sun.visible = s.altitude > -3;
+
+    hemi.intensity = 0.28 + 0.95 * dusk;
+    ambient.intensity = 0.10 + 0.30 * dusk;
+
+    const zen = new Color().setHSL(0.60, 0.62 - 0.2 * warm, 0.12 + 0.42 * dusk);
+    const hor = new Color().setHSL(0.58 - 0.10 * warm, 0.45 + 0.25 * warm, 0.18 + 0.66 * dusk);
+    skyMat.uniforms.uZenith.value.copy(zen);
+    skyMat.uniforms.uHorizon.value.copy(hor);
+    skyMat.uniforms.uGround.value.setHSL(0.25, 0.16, 0.06 + 0.26 * dusk);
+    skyMat.uniforms.uSun.value.copy(s.direction);
+    skyMat.uniforms.uSunIntensity.value = Math.max(0, dusk);
+
+    (scene.fog as Fog).color.copy(hor);
+
+    return s;
+  }
+
+  return { group, sun, update, isDark: () => dark };
+}
diff --git a/src/scene/geometry.ts b/src/scene/geometry.ts
new file mode 100644
index 0000000..93d6c30
--- /dev/null
+++ b/src/scene/geometry.ts
@@ -0,0 +1,244 @@
+/**
+ * Geometrie-Bausteine: Polygone auf das Gelaende legen, Mauern extrudieren.
+ */
+import { BufferGeometry, BufferAttribute, ShapeUtils, Vector2 } from 'three';
+import type { Vec2 } from '../site';
+
+type Tri = [Vec2, Vec2, Vec2];
+
+/** Zerlegt ein einfaches Polygon in Dreiecke (Ohrenschneiden aus three.js). */
+export function triangulate(polygon: Vec2[]): Tri[] {
+  const contour = polygon.map(([x, z]) => new Vector2(x, z));
+  const faces = ShapeUtils.triangulateShape(contour, []);
+  return faces.map(([a, b, c]) => [polygon[a], polygon[b], polygon[c]] as Tri);
+}
+
+/**
+ * Verfeinert Dreiecke, bis keine Kante laenger als `maxEdge` ist. Damit folgen
+ * grosse Flaechen dem Gelaende, statt es zu ueberspannen.
+ */
+export function refine(tris: Tri[], maxEdge: number, maxDepth = 10): Tri[] {
+  let current = tris;
+  for (let depth = 0; depth < maxDepth; depth++) {
+    const next: Tri[] = [];
+    let split = false;
+    for (const t of current) {
+      const lens = [0, 1, 2].map((i) => {
+        const a = t[i], b = t[(i + 1) % 3];
+        return Math.hypot(a[0] - b[0], a[1] - b[1]);
+      });
+      const longest = lens.indexOf(Math.max(...lens));
+      if (lens[longest] <= maxEdge) { next.push(t); continue; }
+      split = true;
+      const a = t[longest], b = t[(longest + 1) % 3], c = t[(longest + 2) % 3];
+      const m: Vec2 = [(a[0] + b[0]) / 2, (a[1] + b[1]) / 2];
+      next.push([a, m, c], [m, b, c]);
+    }
+    current = next;
+    if (!split) break;
+  }
+  return current;
+}
+
+/**
+ * Baut ein Flaechenmesh, das dem Gelaende folgt.
+ * UVs sind weltbezogen, damit Plattenraster ueber Flaechengrenzen durchlaufen.
+ */
+export function surfaceGeometry(
+  polygon: Vec2[],
+  height: (x: number, z: number) => number,
+  opts: { offset?: number; tile?: number; maxEdge?: number } = {},
+): BufferGeometry {
+  const { offset = 0.01, tile = 1, maxEdge = 0.3 } = opts;
+  const tris = refine(triangulate(polygon), maxEdge);
+  const pos = new Float32Array(tris.length * 9);
+  const uv = new Float32Array(tris.length * 6);
+  let p = 0, u = 0;
+  for (const t of tris) {
+    for (const [x, z] of t) {
+      pos[p++] = x;
+      pos[p++] = height(x, z) + offset;
+      pos[p++] = z;
+      uv[u++] = x / tile;
+      uv[u++] = -z / tile;
+    }
+  }
+  const g = new BufferGeometry();
+  g.setAttribute('position', new BufferAttribute(pos, 3));
+  g.setAttribute('uv', new BufferAttribute(uv, 2));
+  g.computeVertexNormals();
+  return g;
+}
+
+/** Fasst mehrere Polygone zu einem Mesh zusammen. */
+export function surfaceGeometryMulti(
+  polygons: Vec2[][],
+  height: (x: number, z: number) => number,
+  opts: { offset?: number; tile?: number; maxEdge?: number } = {},
+): BufferGeometry {
+  const parts = polygons.map((p) => surfaceGeometry(p, height, opts));
+  return mergeGeometries(parts);
+}
+
+/** Einfaches Zusammenfuehren gleichartiger Geometrien (position/uv/normal). */
+export function mergeGeometries(parts: BufferGeometry[]): BufferGeometry {
+  const total = parts.reduce((n, g) => n + g.getAttribute('position').count, 0);
+  const pos = new Float32Array(total * 3);
+  const nor = new Float32Array(total * 3);
+  const uv = new Float32Array(total * 2);
+  let o = 0;
+  for (const g of parts) {
+    const gp = g.getAttribute('position') as BufferAttribute;
+    const gn = g.getAttribute('normal') as BufferAttribute;
+    const gu = g.getAttribute('uv') as BufferAttribute;
+    pos.set(gp.array as Float32Array, o * 3);
+    nor.set(gn.array as Float32Array, o * 3);
+    uv.set(gu.array as Float32Array, o * 2);
+    o += gp.count;
+    g.dispose();
+  }
+  const g = new BufferGeometry();
+  g.setAttribute('position', new BufferAttribute(pos, 3));
+  g.setAttribute('normal', new BufferAttribute(nor, 3));
+  g.setAttribute('uv', new BufferAttribute(uv, 2));
+  return g;
+}
+
+interface Quad { a: [number, number, number]; b: [number, number, number]; c: [number, number, number]; d: [number, number, number] }
+
+/** Haengt ein Viereck (gegen den Uhrzeigersinn) an die Puffer an. */
+function pushQuad(pos: number[], uv: number[], q: Quad, uScale: number, vScale: number, uOff = 0) {
+  const [ax, ay, az] = q.a, [bx, by, bz] = q.b, [cx, cy, cz] = q.c, [dx, dy, dz] = q.d;
+  const du = Math.hypot(bx - ax, bz - az) * uScale;
+  const v0 = ay * vScale, v1 = cy * vScale, v2 = dy * vScale, v3 = by * vScale;
+  pos.push(ax, ay, az, bx, by, bz, cx, cy, cz);
+  uv.push(uOff, v0, uOff + du, v3, uOff + du, v1);
+  pos.push(ax, ay, az, cx, cy, cz, dx, dy, dz);
+  uv.push(uOff, v0, uOff + du, v1, uOff, v2);
+}
+
+/**
+ * Extrudiert eine Mauer entlang einer Mittellinie.
+ * `top`/`base` liefern fuer einen Parameter t (0..1) die Kronen- bzw. Fusshoehe.
+ */
+export function wallGeometry(
+  path: Vec2[],
+  thickness: number,
+  top: (t: number, x: number, z: number) => number,
+  base: (t: number, x: number, z: number) => number,
+  opts: { segments?: number; tile?: number } = {},
+): BufferGeometry {
+  const { segments = 24, tile = 1.6 } = opts;
+  const pos: number[] = [];
+  const uv: number[] = [];
+  const h = thickness / 2;
+  const s = 1 / tile;
+
+  // Laenge und Richtungen entlang des Pfades
+  const pts: { x: number; z: number; nx: number; nz: number; t: number }[] = [];
+  const totalLen = path.slice(1).reduce((L, p, i) => L + Math.hypot(p[0] - path[i][0], p[1] - path[i][1]), 0);
+  for (let i = 0; i <= segments; i++) {
+    const t = i / segments;
+    // Punkt auf dem Polyzug bei Bogenlaenge t * totalLen
+    let want = t * totalLen;
+    let x = path[0][0], z = path[0][1], dx = 1, dz = 0;
+    for (let k = 1; k < path.length; k++) {
+      const ax = path[k - 1][0], az = path[k - 1][1];
+      const bx = path[k][0], bz = path[k][1];
+      const L = Math.hypot(bx - ax, bz - az);
+      if (want <= L || k === path.length - 1) {
+        const u = L > 0 ? Math.min(1, want / L) : 0;
+        x = ax + (bx - ax) * u; z = az + (bz - az) * u;
+        dx = (bx - ax) / (L || 1); dz = (bz - az) / (L || 1);
+        break;
+      }
+      want -= L;
+    }
+    pts.push({ x, z, nx: -dz, nz: dx, t });
+  }
+
+  let uRun = 0;
+  for (let i = 0; i < segments; i++) {
+    const p0 = pts[i], p1 = pts[i + 1];
+    const t0 = top(p0.t, p0.x, p0.z), t1 = top(p1.t, p1.x, p1.z);
+    const b0 = base(p0.t, p0.x, p0.z), b1 = base(p1.t, p1.x, p1.z);
+    const segLen = Math.hypot(p1.x - p0.x, p1.z - p0.z);
+
+    const l0: Vec2 = [p0.x + p0.nx * h, p0.z + p0.nz * h];
+    const r0: Vec2 = [p0.x - p0.nx * h, p0.z - p0.nz * h];
+    const l1: Vec2 = [p1.x + p1.nx * h, p1.z + p1.nz * h];
+    const r1: Vec2 = [p1.x - p1.nx * h, p1.z - p1.nz * h];
+
+    // linke Flanke
+    pushQuad(pos, uv, {
+      a: [l0[0], b0, l0[1]], b: [l1[0], b1, l1[1]],
+      c: [l1[0], t1, l1[1]], d: [l0[0], t0, l0[1]],
+    }, s, s, uRun * s);
+    // rechte Flanke
+    pushQuad(pos, uv, {
+      a: [r1[0], b1, r1[1]], b: [r0[0], b0, r0[1]],
+      c: [r0[0], t0, r0[1]], d: [r1[0], t1, r1[1]],
+    }, s, s, uRun * s);
+    // Krone
+    pos.push(l0[0], t0, l0[1], r0[0], t0, r0[1], r1[0], t1, r1[1]);
+    uv.push(uRun * s, 0, uRun * s, thickness * s, (uRun + segLen) * s, thickness * s);
+    pos.push(l0[0], t0, l0[1], r1[0], t1, r1[1], l1[0], t1, l1[1]);
+    uv.push(uRun * s, 0, (uRun + segLen) * s, thickness * s, (uRun + segLen) * s, 0);
+    uRun += segLen;
+  }
+
+  // Stirnseiten
+  for (const [p, sign] of [[pts[0], -1], [pts[pts.length - 1], 1]] as const) {
+    const tp = top(p.t, p.x, p.z), bs = base(p.t, p.x, p.z);
+    const l: Vec2 = [p.x + p.nx * h, p.z + p.nz * h];
+    const r: Vec2 = [p.x - p.nx * h, p.z - p.nz * h];
+    const A = sign < 0 ? l : r, B = sign < 0 ? r : l;
+    pushQuad(pos, uv, {
+      a: [A[0], bs, A[1]], b: [B[0], bs, B[1]],
+      c: [B[0], tp, B[1]], d: [A[0], tp, A[1]],
+    }, s, s, 0);
+  }
+
+  const g = new BufferGeometry();
+  g.setAttribute('position', new BufferAttribute(new Float32Array(pos), 3));
+  g.setAttribute('uv', new BufferAttribute(new Float32Array(uv), 2));
+  g.computeVertexNormals();
+  return g;
+}
+
+/** Quaderfoermiges Volumen mit weltbezogenen UVs, fuer Bauteile und Moebel. */
+export function boxGeometry(
+  cx: number, cz: number, w: number, d: number, y0: number, y1: number, rotDeg = 0, tile = 1,
+): BufferGeometry {
+  const pos: number[] = [];
+  const uv: number[] = [];
+  const a = (rotDeg * Math.PI) / 180;
+  const ca = Math.cos(a), sa = Math.sin(a);
+  const P = (u: number, v: number, y: number): [number, number, number] =>
+    [cx + u * ca - v * sa, y, cz + u * sa + v * ca];
+  const hw = w / 2, hd = d / 2;
+  const s = 1 / tile;
+  const faces: [Vec2, Vec2, number][] = [
+    [[-hw, -hd], [hw, -hd], 1], [[hw, -hd], [hw, hd], 1],
+    [[hw, hd], [-hw, hd], 1], [[-hw, hd], [-hw, -hd], 1],
+  ];
+  let uRun = 0;
+  for (const [p0, p1] of faces) {
+    const len = Math.hypot(p1[0] - p0[0], p1[1] - p0[1]);
+    const A = P(p0[0], p0[1], y0), B = P(p1[0], p1[1], y0);
+    const C = P(p1[0], p1[1], y1), D = P(p0[0], p0[1], y1);
+    pos.push(...A, ...B, ...C, ...A, ...C, ...D);
+    uv.push(uRun * s, y0 * s, (uRun + len) * s, y0 * s, (uRun + len) * s, y1 * s);
+    uv.push(uRun * s, y0 * s, (uRun + len) * s, y1 * s, uRun * s, y1 * s);
+    uRun += len;
+  }
+  // Deckel
+  const t0 = P(-hw, -hd, y1), t1 = P(hw, -hd, y1), t2 = P(hw, hd, y1), t3 = P(-hw, hd, y1);
+  pos.push(...t0, ...t1, ...t2, ...t0, ...t2, ...t3);
+  uv.push(0, 0, w * s, 0, w * s, d * s, 0, 0, w * s, d * s, 0, d * s);
+  const g = new BufferGeometry();
+  g.setAttribute('position', new BufferAttribute(new Float32Array(pos), 3));
+  g.setAttribute('uv', new BufferAttribute(new Float32Array(uv), 2));
+  g.computeVertexNormals();
+  return g;
+}
diff --git a/src/scene/structures.ts b/src/scene/structures.ts
new file mode 100644
index 0000000..2b6254e
--- /dev/null
+++ b/src/scene/structures.ts
@@ -0,0 +1,302 @@
+/**
+ * Bauteile: Stuetz- und Sitzmauern, Travertinstelen, Gartenhaus, Spielhaus,
+ * Flammengrill, Baenkli, Leuchten.
+ */
+import {
+  BoxGeometry, CylinderGeometry, Group, Mesh, MeshStandardMaterial, PointLight,
+  type MeshStandardMaterialParameters,
+} from 'three';
+import type { Lamp, Prop, Stele, Wall } from '../site';
+import { boxGeometry, wallGeometry } from './geometry';
+import * as tex from './textures';
+
+function material(belag: tex.Belag, extra: MeshStandardMaterialParameters = {}) {
+  return new MeshStandardMaterial({
+    map: belag.map, roughness: belag.roughness, metalness: 0, ...extra,
+  });
+}
+
+const WALL_LOOK: Record<Wall['type'], () => tex.Belag> = {
+  travertin: tex.travertinMauer,
+  beton: tex.beton,
+  holzscheiter: tex.holzscheiter,
+  lamellen: tex.fassadeHolz,
+};
+
+/** Wertet ein Hoehenprofil (Stuetzelemente) an der Stelle t aus. */
+function profileAt(profile: number[] | undefined, t: number, fallback: number): number {
+  if (!profile || !profile.length) return fallback;
+  const f = t * (profile.length - 1);
+  const i = Math.max(0, Math.min(profile.length - 2, Math.floor(f)));
+  const u = f - i;
+  return profile[i] * (1 - u) + profile[i + 1] * u;
+}
+
+export function buildWalls(walls: Wall[], height: (x: number, z: number) => number): Group {
+  const group = new Group();
+  group.name = 'Mauern und Wände';
+
+  for (const w of walls) {
+    const belag = WALL_LOOK[w.type]();
+    const top = (t: number, x: number, z: number) =>
+      w.crestProfile ? profileAt(w.crestProfile, t, 0) : (w.top ?? height(x, z) + 0.4);
+    const base = (t: number, x: number, z: number) =>
+      w.footProfile ? profileAt(w.footProfile, t, -1) : (w.base ?? height(x, z) - 0.5);
+
+    if (w.openSlats) {
+      // Lamellenwand: senkrechte Bretter im Plan-Rhythmus (10 cm breit,
+      // 35 cm tief, rund 90 cm Achsabstand), dazu das schmale Randband.
+      const slats = new Group();
+      const [a, b] = [w.path[0], w.path[w.path.length - 1]];
+      const len = Math.hypot(b[0] - a[0], b[1] - a[1]);
+      const n = Math.max(2, Math.round(len / 0.9));
+      const mat = material(belag, { roughness: 0.85 });
+      const dirX = (b[0] - a[0]) / len, dirZ = (b[1] - a[1]) / len;
+      const angle = (Math.atan2(dirZ, dirX) * 180) / Math.PI;
+      for (let i = 0; i <= n; i++) {
+        const t = i / n;
+        const x = a[0] + (b[0] - a[0]) * t;
+        const z = a[1] + (b[1] - a[1]) * t;
+        const g = boxGeometry(x, z, 0.10, w.t, base(t, x, z), top(t, x, z), angle, 1.2);
+        const m = new Mesh(g, mat);
+        m.castShadow = true;
+        m.receiveShadow = true;
+        slats.add(m);
+      }
+      // durchlaufendes Randband an der Fassadenkante
+      const band = new Mesh(
+        wallGeometry(w.path, 0.10, top, base, { segments: 6, tile: belag.tile }),
+        mat,
+      );
+      band.castShadow = true;
+      band.receiveShadow = true;
+      slats.add(band);
+      slats.name = w.id;
+      slats.userData.note = w.note;
+      group.add(slats);
+      continue;
+    }
+
+    const geo = wallGeometry(w.path, w.t, top, base, {
+      segments: w.crestProfile ? w.crestProfile.length - 1 : 16,
+      tile: belag.tile,
+    });
+    const mesh = new Mesh(geo, material(belag));
+    mesh.name = w.id;
+    mesh.castShadow = true;
+    mesh.receiveShadow = true;
+    mesh.userData.note = w.note;
+    group.add(mesh);
+  }
+
+  return group;
+}
+
+export function buildStelen(stelen: Stele[], height: (x: number, z: number) => number): Group {
+  const group = new Group();
+  group.name = 'Travertinstelen';
+  const mat = material(tex.travertinMauer(), { roughness: 0.68 });
+  for (const s of stelen) {
+    const y0 = height(s.x, s.z) - 0.3;
+    const geo = boxGeometry(s.x, s.z, 0.22, 0.22, y0, y0 + 0.3 + s.h, 0, 1.6);
+    const m = new Mesh(geo, mat);
+    m.castShadow = true;
+    m.receiveShadow = true;
+    group.add(m);
+  }
+  return group;
+}
+
+// ---------------------------------------------------------------------------
+// Freistehende Objekte
+// ---------------------------------------------------------------------------
+
+function gartenhaus(p: Prop, y: number): Group {
+  const g = new Group();
+  const holz = material(tex.fassadeHolz(), { roughness: 0.8 });
+  const body = new Mesh(boxGeometry(p.x, p.z, p.w, p.d, y, y + p.h, p.rot, 1.2), holz);
+  body.castShadow = true; body.receiveShadow = true;
+  g.add(body);
+  const roof = new Mesh(
+    boxGeometry(p.x, p.z, p.w + 0.16, p.d + 0.16, y + p.h, y + p.h + 0.09, p.rot, 2),
+    material(tex.beton(), { color: 0x6a6a66, roughness: 0.9 }),
+  );
+  roof.castShadow = true;
+  g.add(roof);
+  // Tuer
+  const door = new Mesh(
+    new BoxGeometry(0.78, 1.95, 0.04),
+    new MeshStandardMaterial({ color: 0x3b3934, roughness: 0.6 }),
+  );
+  door.position.set(p.x, y + 0.98, p.z - p.d / 2 - 0.02);
+  g.add(door);
+  return g;
+}
+
+/** Spielhaus durch Zimmermann: Podest, Bretterwaende, Gelaender, Pultdach. */
+function spielhaus(p: Prop, y: number): Group {
+  const g = new Group();
+  const holz = material(tex.fassadeHolz(), { color: 0xd8b98c, roughness: 0.85 });
+  const dunkel = material(tex.fassadeHolz(), { color: 0xa8895f, roughness: 0.88 });
+  const podestTop = y + 0.55;
+
+  const podest = new Mesh(boxGeometry(p.x, p.z, p.w, p.d, y - 0.1, podestTop, p.rot, 1.2), dunkel);
+  podest.castShadow = true; podest.receiveShadow = true;
+  g.add(podest);
+
+  const hw = p.w / 2, hd = p.d / 2;
+  // Rueckwand und zwei Seitenwaende, Vorderseite offen
+  const back = new Mesh(boxGeometry(p.x, p.z + hd - 0.05, p.w, 0.09, podestTop, y + p.h, p.rot, 1.2), holz);
+  const left = new Mesh(boxGeometry(p.x - hw + 0.05, p.z, 0.09, p.d, podestTop, y + p.h, p.rot, 1.2), holz);
+  const right = new Mesh(boxGeometry(p.x + hw - 0.05, p.z - hd / 3, 0.09, p.d / 3, podestTop, y + p.h, p.rot, 1.2), holz);
+  for (const m of [back, left, right]) { m.castShadow = true; m.receiveShadow = true; g.add(m); }
+
+  // Bruestung an der offenen Seite
+  const rail = new Mesh(boxGeometry(p.x, p.z - hd + 0.05, p.w, 0.07, podestTop + 0.32, podestTop + 0.45, p.rot, 1.2), holz);
+  rail.castShadow = true;
+  g.add(rail);
+
+  const roof = new Mesh(
+    boxGeometry(p.x, p.z, p.w + 0.26, p.d + 0.26, y + p.h, y + p.h + 0.09, p.rot, 2),
+    material(tex.fassadeHolz(), { color: 0x7d6549, roughness: 0.9 }),
+  );
+  roof.castShadow = true;
+  g.add(roof);
+  return g;
+}
+
+function flammengrill(p: Prop, y: number): Group {
+  const g = new Group();
+  const steel = new MeshStandardMaterial({ color: 0x3a3b3e, roughness: 0.5, metalness: 0.45 });
+  const body = new Mesh(boxGeometry(p.x, p.z, p.w, p.d, y + 0.06, y + p.h, p.rot, 1), steel);
+  body.castShadow = true; body.receiveShadow = true;
+  g.add(body);
+  const plate = new Mesh(
+    boxGeometry(p.x, p.z, p.w + 0.1, p.d + 0.1, y + p.h, y + p.h + 0.03, p.rot, 1),
+    new MeshStandardMaterial({ color: 0x3a3a3c, roughness: 0.35, metalness: 0.7 }),
+  );
+  plate.castShadow = true;
+  g.add(plate);
+  return g;
+}
+
+function bank(p: Prop, y: number): Group {
+  const g = new Group();
+  const stein = material(tex.travertinMauer(), { roughness: 0.65 });
+  const seat = new Mesh(boxGeometry(p.x, p.z, p.w, p.d, y + p.h - 0.09, y + p.h, p.rot, 1.6), stein);
+  seat.castShadow = true; seat.receiveShadow = true;
+  g.add(seat);
+  for (const s of [-1, 1]) {
+    const m = new Mesh(
+      boxGeometry(p.x, p.z + (s * (p.d / 2 - 0.22)), p.w - 0.08, 0.14, y, y + p.h - 0.09, p.rot, 1.6),
+      stein,
+    );
+    m.castShadow = true;
+    g.add(m);
+  }
+  return g;
+}
+
+function simpleBox(p: Prop, y: number, color: number, rough = 0.7): Mesh {
+  const m = new Mesh(
+    boxGeometry(p.x, p.z, p.w, p.d, y, y + p.h, p.rot, 1),
+    new MeshStandardMaterial({ color, roughness: rough }),
+  );
+  m.castShadow = true;
+  m.receiveShadow = true;
+  return m;
+}
+
+function gartentor(p: Prop, y: number): Group {
+  const g = new Group();
+  const mat = new MeshStandardMaterial({ color: 0x4a4a4c, roughness: 0.5, metalness: 0.4 });
+  const frame = new Mesh(boxGeometry(p.x, p.z, p.w, 0.05, y, y + p.h, p.rot, 1), mat);
+  g.add(frame);
+  for (let i = 1; i < 6; i++) {
+    const bar = new Mesh(
+      boxGeometry(p.x - p.w / 2 + (i * p.w) / 6, p.z, 0.03, 0.03, y, y + p.h, p.rot, 1),
+      mat,
+    );
+    g.add(bar);
+  }
+  g.children.forEach((c) => { (c as Mesh).castShadow = true; });
+  return g;
+}
+
+export function buildProps(props: Prop[], height: (x: number, z: number) => number): Group {
+  const group = new Group();
+  group.name = 'Objekte';
+  for (const p of props) {
+    const y = height(p.x, p.z);
+    let obj: Group | Mesh;
+    switch (p.type) {
+      case 'gartenhaus': obj = gartenhaus(p, y); break;
+      case 'spielhaus': obj = spielhaus(p, y); break;
+      case 'flammengrill': obj = flammengrill(p, y); break;
+      case 'bank': obj = bank(p, y); break;
+      case 'tor': obj = gartentor(p, y); break;
+      case 'roboter': obj = simpleBox(p, y, 0x33413a, 0.6); break;
+      case 'wasserhahn': obj = simpleBox(p, y, 0x8a8d90, 0.4); break;
+      case 'schacht': obj = simpleBox(p, y - 0.01, 0x77746e, 0.9); break;
+      default: continue;
+    }
+    obj.name = p.id;
+    obj.userData.note = p.note;
+    group.add(obj);
+  }
+  return group;
+}
+
+// ---------------------------------------------------------------------------
+// Beleuchtung im Garten
+// ---------------------------------------------------------------------------
+
+export interface GardenLights {
+  group: Group;
+  /** Schaltet die Leuchten je nach Tageszeit. */
+  setOn(on: boolean): void;
+}
+
+export function buildLamps(lamps: Lamp[], height: (x: number, z: number) => number): GardenLights {
+  const group = new Group();
+  group.name = 'Beleuchtung';
+  const bodyMat = new MeshStandardMaterial({ color: 0x33332f, roughness: 0.55, metalness: 0.3 });
+  const glowMat = new MeshStandardMaterial({
+    color: 0xffd9a0, emissive: 0xffc26e, emissiveIntensity: 0, roughness: 0.4,
+  });
+  const pointLights: PointLight[] = [];
+
+  for (const l of lamps) {
+    const y = height(l.x, l.z);
+    const g = new Group();
+    if (l.kind === 'poller') {
+      const post = new Mesh(new BoxGeometry(0.09, 0.62, 0.09), bodyMat);
+      post.position.set(l.x, y + 0.31, l.z);
+      post.castShadow = true;
+      g.add(post);
+      const head = new Mesh(new BoxGeometry(0.11, 0.06, 0.11), glowMat);
+      head.position.set(l.x, y + 0.6, l.z);
+      g.add(head);
+    } else {
+      const ring = new Mesh(new CylinderGeometry(0.07, 0.07, 0.03, 16), bodyMat);
+      ring.position.set(l.x, y + 0.015, l.z);
+      g.add(ring);
+      const lens = new Mesh(new CylinderGeometry(0.05, 0.05, 0.035, 16), glowMat);
+      lens.position.set(l.x, y + 0.025, l.z);
+      g.add(lens);
+    }
+    const pl = new PointLight(0xffc98a, 0, 6, 2);
+    pl.position.set(l.x, y + (l.kind === 'poller' ? 0.6 : 0.1), l.z);
+    pointLights.push(pl);
+    g.add(pl);
+    group.add(g);
+  }
+
+  return {
+    group,
+    setOn(on: boolean) {
+      glowMat.emissiveIntensity = on ? 1.6 : 0;
+      for (const pl of pointLights) pl.intensity = on ? 2.2 : 0;
+    },
+  };
+}
diff --git a/src/scene/surfaces.ts b/src/scene/surfaces.ts
new file mode 100644
index 0000000..8790ef0
--- /dev/null
+++ b/src/scene/surfaces.ts
@@ -0,0 +1,62 @@
+/**
+ * Belagsflaechen aus dem Gartenplan: Travertin, Keramik, Tegula, Rasen,
+ * Schotterwiese, Beete, Spielsand.
+ */
+import { Group, Mesh, MeshStandardMaterial, DoubleSide } from 'three';
+import type { Surface, SurfaceType } from '../site';
+import { surfaceGeometryMulti } from './geometry';
+import * as tex from './textures';
+
+const BELAG: Record<SurfaceType, { belag: () => tex.Belag; offset: number; label: string }> = {
+  travertin80:    { belag: tex.travertin80,    offset: 0.042, label: 'Travertinplatten 80×80×3 cm' },
+  travertin4060:  { belag: tex.travertin4060,  offset: 0.042, label: 'Travertinplatten 40×60×3 cm mit Dekorkies' },
+  travertinstell: { belag: tex.travertinstell, offset: 0.038, label: 'Travertinstellplatten' },
+  keramik:        { belag: tex.keramik,        offset: 0.032, label: 'Keramikplatten 60×60×2 cm' },
+  verbundstein:   { belag: tex.verbundstein,   offset: 0.030, label: 'Verbundsteine (Anpassung Nachbar)' },
+  tegula:         { belag: tex.tegula,         offset: 0.034, label: 'Tegula-Pflastersteine grau' },
+  rasen:          { belag: tex.rasen,          offset: 0.022, label: 'Rasen' },
+  schotterwiese:  { belag: tex.schotterwiese,  offset: 0.020, label: 'Schotterwiese' },
+  beet:           { belag: tex.beet,           offset: 0.018, label: 'Pflanzbeet' },
+  spielsand:      { belag: tex.spielsand,      offset: 0.016, label: 'Spielsand' },
+};
+
+export function buildSurfaces(
+  surfaces: Surface[],
+  height: (x: number, z: number) => number,
+): Group {
+  const group = new Group();
+  group.name = 'Beläge';
+
+  const byType = new Map<SurfaceType, Surface[]>();
+  for (const s of surfaces) {
+    const list = byType.get(s.type) ?? [];
+    list.push(s);
+    byType.set(s.type, list);
+  }
+
+  for (const [type, list] of byType) {
+    const def = BELAG[type];
+    if (!def) continue;
+    const belag = def.belag();
+    const geo = surfaceGeometryMulti(
+      list.map((s) => s.polygon),
+      height,
+      { offset: def.offset, tile: belag.tile, maxEdge: 0.28 },
+    );
+    const mesh = new Mesh(geo, new MeshStandardMaterial({
+      map: belag.map,
+      roughness: belag.roughness,
+      metalness: 0,
+      side: DoubleSide,
+      polygonOffset: true,
+      polygonOffsetFactor: -1,
+      polygonOffsetUnits: -1,
+    }));
+    mesh.name = def.label;
+    mesh.receiveShadow = true;
+    mesh.userData.surfaceType = type;
+    group.add(mesh);
+  }
+
+  return group;
+}
diff --git a/src/scene/terrain.ts b/src/scene/terrain.ts
new file mode 100644
index 0000000..13abca7
--- /dev/null
+++ b/src/scene/terrain.ts
@@ -0,0 +1,116 @@
+/**
+ * Gelaende: Basismesh aus dem Hoehenraster, plus eine weite, flache Umgebung,
+ * damit der Garten nicht im Nichts steht.
+ */
+import {
+  BufferAttribute, BufferGeometry, DoubleSide, Mesh, MeshStandardMaterial, Group,
+} from 'three';
+import type { Terrain } from '../site';
+import { rasen, schotterwiese } from './textures';
+
+export function buildTerrain(terrain: Terrain): Group {
+  const group = new Group();
+  group.name = 'Gelände';
+  const { x0, z0, cell, nx, nz } = terrain.grid;
+  const h = terrain.heights;
+
+  // --- Hauptgelaende -------------------------------------------------------
+  const geo = new BufferGeometry();
+  const verts = new Float32Array(nx * nz * 3);
+  const uvs = new Float32Array(nx * nz * 2);
+  const belag = rasen();
+  for (let j = 0; j < nz; j++) {
+    for (let i = 0; i < nx; i++) {
+      const k = j * nx + i;
+      const x = x0 + i * cell, z = z0 + j * cell;
+      verts[k * 3] = x;
+      verts[k * 3 + 1] = h[k];
+      verts[k * 3 + 2] = z;
+      uvs[k * 2] = x / belag.tile;
+      uvs[k * 2 + 1] = -z / belag.tile;
+    }
+  }
+  const idx: number[] = [];
+  for (let j = 0; j < nz - 1; j++) {
+    for (let i = 0; i < nx - 1; i++) {
+      const a = j * nx + i, b = a + 1, c = a + nx, d = c + 1;
+      idx.push(a, c, b, b, c, d);
+    }
+  }
+  geo.setAttribute('position', new BufferAttribute(verts, 3));
+  geo.setAttribute('uv', new BufferAttribute(uvs, 2));
+  geo.setIndex(idx);
+  geo.computeVertexNormals();
+
+  const ground = new Mesh(geo, new MeshStandardMaterial({
+    map: belag.map, roughness: belag.roughness, metalness: 0,
+  }));
+  ground.name = 'Terrain';
+  ground.receiveShadow = true;
+  group.add(ground);
+
+  // --- Umland ---------------------------------------------------------------
+  // Das Grundstueck liegt an einem Hang ueber dem Tal. Das Umland wird als
+  // Kranz direkt an die Randpunkte des Rasters gehaengt - so entsteht keine
+  // sichtbare Kante - und faellt gegen aussen ab, vor allem nach Suedwesten.
+  const wiese = schotterwiese();
+  const cx = x0 + ((nx - 1) * cell) / 2;
+  const cz = z0 + ((nz - 1) * cell) / 2;
+
+  /**
+   * Randpunkte des Rasters im Umlauf, bewusst grob abgetastet: bei jedem
+   * Rasterpunkt entstuenden extrem schlanke Dreiecke, deren Normalen
+   * unbrauchbar werden und sich als dunkle Streifen abzeichnen.
+   */
+  const STEP = 10;
+  const border: { x: number; z: number; y: number }[] = [];
+  const at = (i: number, j: number) => ({
+    x: x0 + i * cell, z: z0 + j * cell, y: h[j * nx + i] - 0.05,
+  });
+  for (let i = 0; i < nx - 1; i += STEP) border.push(at(i, 0));
+  for (let j = 0; j < nz - 1; j += STEP) border.push(at(nx - 1, j));
+  for (let i = nx - 1; i > 0; i -= STEP) border.push(at(i, nz - 1));
+  for (let j = nz - 1; j > 0; j -= STEP) border.push(at(0, j));
+
+  // Der Kranz entsteht durch reine Skalierung des Randpolygons um den
+  // Mittelpunkt. Das kann sich nicht selbst durchdringen, egal wie weit
+  // hinausskaliert wird, und schliesst luecklos an das Raster an.
+  const RINGS = 26;
+  const SCALE_MAX = 18;
+  const ringPos: number[] = [];
+  const ringUv: number[] = [];
+  const ringIdx: number[] = [];
+  const n = border.length;
+  for (let k = 0; k <= RINGS; k++) {
+    const t = (k / RINGS) ** 2.4;
+    const s = 1 + (SCALE_MAX - 1) * t;
+    for (const p of border) {
+      const dx = p.x - cx, dz = p.z - cz;
+      const x = cx + dx * s;
+      const z = cz + dz * s;
+      // Nach Suedwesten faellt das Gelaende deutlich staerker ab (Blick ins Tal).
+      const sw = (1 - Math.cos(Math.atan2(dz, dx) - 2.4)) / 2;
+      ringPos.push(x, p.y - t * (6 + 26 * sw * sw), z);
+      ringUv.push(x / (wiese.tile * 5), -z / (wiese.tile * 5));
+    }
+  }
+  for (let k = 0; k < RINGS; k++) {
+    for (let i = 0; i < n; i++) {
+      const a = k * n + i, b = k * n + ((i + 1) % n);
+      const c = (k + 1) * n + i, d = (k + 1) * n + ((i + 1) % n);
+      ringIdx.push(a, c, b, b, c, d);
+    }
+  }
+  const far = new BufferGeometry();
+  far.setAttribute('position', new BufferAttribute(new Float32Array(ringPos), 3));
+  far.setAttribute('uv', new BufferAttribute(new Float32Array(ringUv), 2));
+  far.setIndex(ringIdx);
+  far.computeVertexNormals();
+  const surroundings = new Mesh(far, new MeshStandardMaterial({
+    map: wiese.map, roughness: 1, metalness: 0, color: 0x86935f, side: DoubleSide,
+  }));
+  surroundings.name = 'Umland';
+  group.add(surroundings);
+
+  return group;
+}
diff --git a/src/scene/textures.ts b/src/scene/textures.ts
new file mode 100644
index 0000000..1761af2
--- /dev/null
+++ b/src/scene/textures.ts
@@ -0,0 +1,401 @@
+/**
+ * Prozedurale Texturen. Die Anwendung soll ohne externe Assets auskommen,
+ * deshalb werden alle Belaege zur Laufzeit auf ein Canvas gezeichnet.
+ *
+ * Konvention: Jede Textur bildet eine quadratische Weltflaeche von `tile`
+ * Metern ab. Die Meshes bekommen weltbezogene UVs (x/tile, z/tile), damit
+ * Plattenraster ueber Flaechengrenzen hinweg durchlaufen - so wie im Plan.
+ */
+import {
+  CanvasTexture, RepeatWrapping, SRGBColorSpace, LinearMipmapLinearFilter,
+} from 'three';
+
+const SIZE = 512;
+
+/** Deterministischer Zufall, damit jeder Aufbau gleich aussieht. */
+function mulberry32(seed: number) {
+  let a = seed >>> 0;
+  return () => {
+    a = (a + 0x6d2b79f5) >>> 0;
+    let t = Math.imul(a ^ (a >>> 15), 1 | a);
+    t = (t + Math.imul(t ^ (t >>> 7), 61 | t)) ^ t;
+    return ((t ^ (t >>> 14)) >>> 0) / 4294967296;
+  };
+}
+
+function canvas(): [HTMLCanvasElement, CanvasRenderingContext2D] {
+  const c = document.createElement('canvas');
+  c.width = SIZE;
+  c.height = SIZE;
+  const ctx = c.getContext('2d', { willReadFrequently: true })!;
+  return [c, ctx];
+}
+
+/** Kachelbares Wertrauschen, wird fuer Koernung und Farbschwankung genutzt. */
+function noiseTile(ctx: CanvasRenderingContext2D, seed: number, cells: number, alpha: number, dark = true) {
+  const rnd = mulberry32(seed);
+  const g: number[] = [];
+  for (let i = 0; i < cells * cells; i++) g.push(rnd());
+  const at = (i: number, j: number) => g[((j + cells) % cells) * cells + ((i + cells) % cells)];
+  const img = ctx.getImageData(0, 0, SIZE, SIZE);
+  const step = SIZE / cells;
+  for (let y = 0; y < SIZE; y++) {
+    const fy = y / step, j = Math.floor(fy), ty = fy - j;
+    for (let x = 0; x < SIZE; x++) {
+      const fx = x / step, i = Math.floor(fx), tx = fx - i;
+      const sx = tx * tx * (3 - 2 * tx), sy = ty * ty * (3 - 2 * ty);
+      const v =
+        at(i, j) * (1 - sx) * (1 - sy) + at(i + 1, j) * sx * (1 - sy) +
+        at(i, j + 1) * (1 - sx) * sy + at(i + 1, j + 1) * sx * sy;
+      const k = (y * SIZE + x) * 4;
+      const d = (dark ? -1 : 1) * (v - 0.5) * 2 * alpha * 255;
+      img.data[k] = Math.max(0, Math.min(255, img.data[k] + d));
+      img.data[k + 1] = Math.max(0, Math.min(255, img.data[k + 1] + d));
+      img.data[k + 2] = Math.max(0, Math.min(255, img.data[k + 2] + d));
+    }
+  }
+  ctx.putImageData(img, 0, 0);
+}
+
+/** Feine Koernung als Ueberlagerung, ohne die Kachelbarkeit zu stoeren. */
+function grain(ctx: CanvasRenderingContext2D, seed: number, amount: number, dotSize = 1) {
+  const rnd = mulberry32(seed);
+  const n = Math.floor((SIZE * SIZE) / (24 * dotSize));
+  for (let i = 0; i < n; i++) {
+    const v = Math.floor(rnd() * 255);
+    ctx.fillStyle = `rgba(${v},${v},${v},${amount})`;
+    ctx.fillRect(rnd() * SIZE, rnd() * SIZE, dotSize, dotSize);
+  }
+}
+
+function texture(c: HTMLCanvasElement): CanvasTexture {
+  const t = new CanvasTexture(c);
+  t.wrapS = t.wrapT = RepeatWrapping;
+  t.colorSpace = SRGBColorSpace;
+  t.anisotropy = 8;
+  t.minFilter = LinearMipmapLinearFilter;
+  t.generateMipmaps = true;
+  return t;
+}
+
+/** Zeichnet ein Plattenraster mit Fuge. slabW/slabH in Metern. */
+function slabs(
+  ctx: CanvasRenderingContext2D, tile: number, slabW: number, slabH: number,
+  base: string, jointColor: string, jointM: number, seed: number, variation: number,
+) {
+  const px = SIZE / tile;
+  ctx.fillStyle = jointColor;
+  ctx.fillRect(0, 0, SIZE, SIZE);
+  const rnd = mulberry32(seed);
+  const cols = Math.round(tile / slabW);
+  const rows = Math.round(tile / slabH);
+  const j = Math.max(1, jointM * px);
+  const [r, g, b] = base.match(/\d+/g)!.map(Number);
+  for (let row = 0; row < rows; row++) {
+    for (let col = 0; col < cols; col++) {
+      const d = (rnd() - 0.5) * 2 * variation;
+      ctx.fillStyle = `rgb(${Math.round(r + d)},${Math.round(g + d)},${Math.round(b + d)})`;
+      ctx.fillRect(col * slabW * px + j / 2, row * slabH * px + j / 2, slabW * px - j, slabH * px - j);
+    }
+  }
+}
+
+export interface Belag {
+  map: CanvasTexture;
+  tile: number;
+  roughness: number;
+  color?: number;
+}
+
+const cache = new Map<string, Belag>();
+
+function make(key: string, tile: number, roughness: number, draw: (ctx: CanvasRenderingContext2D) => void): Belag {
+  const hit = cache.get(key);
+  if (hit) return hit;
+  const [c, ctx] = canvas();
+  draw(ctx);
+  const belag: Belag = { map: texture(c), tile, roughness };
+  cache.set(key, belag);
+  return belag;
+}
+
+// ---------------------------------------------------------------------------
+// Belaege
+// ---------------------------------------------------------------------------
+
+/** Travertinplatten 80 x 80 x 3 cm, warmes Creme mit feiner Poren-Struktur. */
+export const travertin80 = () => make('travertin80', 3.2, 0.72, (ctx) => {
+  slabs(ctx, 3.2, 0.8, 0.8, 'rgb(209,195,168)', 'rgb(170,157,134)', 0.008, 11, 7);
+  noiseTile(ctx, 21, 32, 0.05);
+  grain(ctx, 31, 0.05, 2);
+});
+
+/** Travertinplatten 40 x 60 x 3 cm, im Plan mit Dekorkies in den Fugen. */
+export const travertin4060 = () => make('travertin4060', 2.4, 0.75, (ctx) => {
+  slabs(ctx, 2.4, 0.4, 0.6, 'rgb(212,199,172)', 'rgb(158,150,133)', 0.02, 12, 8);
+  noiseTile(ctx, 22, 32, 0.05);
+  grain(ctx, 32, 0.06, 2);
+});
+
+/** Travertinstellplatten als schmaler Randstreifen. */
+export const travertinstell = () => make('travertinstell', 2.4, 0.75, (ctx) => {
+  slabs(ctx, 2.4, 0.4, 0.4, 'rgb(206,192,166)', 'rgb(164,154,135)', 0.012, 13, 8);
+  noiseTile(ctx, 23, 32, 0.05);
+  grain(ctx, 33, 0.05, 2);
+});
+
+/** Keramikplatten 60 x 60 x 2 cm, grau - bauseits vorhanden (siehe Fotos). */
+export const keramik = () => make('keramik', 2.4, 0.55, (ctx) => {
+  slabs(ctx, 2.4, 0.6, 0.6, 'rgb(160,158,154)', 'rgb(128,127,124)', 0.006, 14, 5);
+  noiseTile(ctx, 24, 48, 0.035);
+  grain(ctx, 34, 0.04, 1);
+});
+
+/** Tegula-Pflastersteine grau, kleinformatig und leicht unregelmaessig. */
+export const tegula = () => make('tegula', 1.2, 0.85, (ctx) => {
+  const px = SIZE / 1.2;
+  ctx.fillStyle = 'rgb(118,116,114)';
+  ctx.fillRect(0, 0, SIZE, SIZE);
+  const rnd = mulberry32(15);
+  const sw = 0.15, sh = 0.1;
+  const cols = Math.round(1.2 / sw), rows = Math.round(1.2 / sh);
+  for (let row = 0; row < rows; row++) {
+    const off = (row % 2) * 0.5;
+    for (let col = -1; col <= cols; col++) {
+      const v = 140 + rnd() * 34;
+      ctx.fillStyle = `rgb(${v | 0},${(v - 2) | 0},${(v - 5) | 0})`;
+      const x = (col + off) * sw * px + 1.2;
+      const y = row * sh * px + 1.2;
+      ctx.fillRect(x, y, sw * px - 2.4, sh * px - 2.4);
+    }
+  }
+  noiseTile(ctx, 25, 24, 0.06);
+  grain(ctx, 35, 0.09, 1);
+});
+
+/** Verbundsteine des Nachbarn, etwas dunkler als Tegula. */
+export const verbundstein = () => make('verbundstein', 1.2, 0.88, (ctx) => {
+  const px = SIZE / 1.2;
+  ctx.fillStyle = 'rgb(110,108,106)';
+  ctx.fillRect(0, 0, SIZE, SIZE);
+  const rnd = mulberry32(16);
+  for (let row = 0; row < 8; row++) {
+    for (let col = 0; col < 8; col++) {
+      const v = 126 + rnd() * 30;
+      ctx.fillStyle = `rgb(${v | 0},${v | 0},${(v - 4) | 0})`;
+      ctx.fillRect(col * 0.15 * px + 1.5, row * 0.15 * px + 1.5, 0.15 * px - 3, 0.15 * px - 3);
+    }
+  }
+  grain(ctx, 36, 0.08, 1);
+});
+
+/** Rasen: gemaehte Flaeche mit leichten Bahnen. */
+export const rasen = () => make('rasen', 2.0, 0.95, (ctx) => {
+  ctx.fillStyle = 'rgb(96,133,62)';
+  ctx.fillRect(0, 0, SIZE, SIZE);
+  noiseTile(ctx, 41, 16, 0.09);
+  noiseTile(ctx, 42, 64, 0.07);
+  const rnd = mulberry32(43);
+  for (let i = 0; i < 5200; i++) {
+    const x = rnd() * SIZE, y = rnd() * SIZE;
+    const v = rnd();
+    ctx.strokeStyle = `rgba(${(78 + v * 62) | 0},${(118 + v * 66) | 0},${(44 + v * 40) | 0},0.55)`;
+    ctx.lineWidth = 1;
+    ctx.beginPath();
+    ctx.moveTo(x, y);
+    ctx.lineTo(x + (rnd() - 0.5) * 3, y - 2 - rnd() * 4);
+    ctx.stroke();
+  }
+});
+
+/** Schotterwiese: magerer Kiesrasen, heller und offener als der Rasen. */
+export const schotterwiese = () => make('schotterwiese', 2.0, 0.98, (ctx) => {
+  ctx.fillStyle = 'rgb(139,146,104)';
+  ctx.fillRect(0, 0, SIZE, SIZE);
+  noiseTile(ctx, 44, 20, 0.1);
+  const rnd = mulberry32(45);
+  for (let i = 0; i < 2600; i++) {
+    const v = 150 + rnd() * 70;
+    ctx.fillStyle = `rgba(${v | 0},${(v - 4) | 0},${(v - 18) | 0},0.8)`;
+    const r = 1 + rnd() * 2.4;
+    ctx.beginPath();
+    ctx.arc(rnd() * SIZE, rnd() * SIZE, r, 0, Math.PI * 2);
+    ctx.fill();
+  }
+  for (let i = 0; i < 1800; i++) {
+    const x = rnd() * SIZE, y = rnd() * SIZE;
+    ctx.strokeStyle = `rgba(112,138,64,0.5)`;
+    ctx.beginPath();
+    ctx.moveTo(x, y);
+    ctx.lineTo(x + (rnd() - 0.5) * 3, y - 3 - rnd() * 3);
+    ctx.stroke();
+  }
+});
+
+/** Dekorkies in den Pflanzflaechen und um den Flammengrill. */
+export const dekorkies = () => make('dekorkies', 1.0, 0.99, (ctx) => {
+  ctx.fillStyle = 'rgb(150,144,132)';
+  ctx.fillRect(0, 0, SIZE, SIZE);
+  const rnd = mulberry32(46);
+  for (let i = 0; i < 6500; i++) {
+    const v = 128 + rnd() * 90;
+    ctx.fillStyle = `rgb(${v | 0},${(v - 5) | 0},${(v - 16) | 0})`;
+    ctx.beginPath();
+    ctx.ellipse(rnd() * SIZE, rnd() * SIZE, 2 + rnd() * 4, 2 + rnd() * 3, rnd() * 3.14, 0, Math.PI * 2);
+    ctx.fill();
+  }
+  noiseTile(ctx, 47, 24, 0.07);
+});
+
+/** Pflanzbeet: dunkler Humus mit Rindenanteil. */
+export const beet = () => make('beet', 1.5, 0.99, (ctx) => {
+  ctx.fillStyle = 'rgb(74,58,44)';
+  ctx.fillRect(0, 0, SIZE, SIZE);
+  noiseTile(ctx, 48, 20, 0.12);
+  const rnd = mulberry32(49);
+  for (let i = 0; i < 2200; i++) {
+    const v = 60 + rnd() * 60;
+    ctx.fillStyle = `rgb(${v | 0},${(v - 12) | 0},${(v - 24) | 0})`;
+    ctx.save();
+    ctx.translate(rnd() * SIZE, rnd() * SIZE);
+    ctx.rotate(rnd() * 3.14);
+    ctx.fillRect(0, 0, 3 + rnd() * 9, 2 + rnd() * 3);
+    ctx.restore();
+  }
+});
+
+/** Spielsand. */
+export const spielsand = () => make('spielsand', 1.5, 1.0, (ctx) => {
+  ctx.fillStyle = 'rgb(211,192,155)';
+  ctx.fillRect(0, 0, SIZE, SIZE);
+  noiseTile(ctx, 50, 28, 0.05);
+  grain(ctx, 51, 0.16, 1);
+});
+
+// ---------------------------------------------------------------------------
+// Bauteile
+// ---------------------------------------------------------------------------
+
+/** Travertin-Mauerwerk in Schichten, wie auf den Referenzfotos des Plans. */
+export const travertinMauer = () => make('travertinMauer', 1.6, 0.7, (ctx) => {
+  const px = SIZE / 1.6;
+  ctx.fillStyle = 'rgb(168,152,126)';
+  ctx.fillRect(0, 0, SIZE, SIZE);
+  const rnd = mulberry32(61);
+  const h = 0.2;
+  for (let row = 0; row < Math.round(1.6 / h); row++) {
+    let x = -((row % 2) * 0.3);
+    while (x < 1.6) {
+      const w = 0.4 + rnd() * 0.4;
+      const v = 202 + rnd() * 26;
+      ctx.fillStyle = `rgb(${v | 0},${(v - 17) | 0},${(v - 44) | 0})`;
+      ctx.fillRect(x * px + 1, row * h * px + 1, w * px - 2, h * px - 2);
+      x += w;
+    }
+  }
+  noiseTile(ctx, 62, 40, 0.045);
+  grain(ctx, 63, 0.05, 2);
+});
+
+/** Sichtbeton der Winkelelemente und der Nachbarmauer. */
+export const beton = () => make('beton', 2.0, 0.8, (ctx) => {
+  ctx.fillStyle = 'rgb(176,174,169)';
+  ctx.fillRect(0, 0, SIZE, SIZE);
+  noiseTile(ctx, 64, 12, 0.05);
+  noiseTile(ctx, 65, 48, 0.025);
+  grain(ctx, 66, 0.04, 1);
+  // Schalungsstoesse
+  ctx.strokeStyle = 'rgba(120,118,114,0.35)';
+  ctx.lineWidth = 1.5;
+  ctx.beginPath();
+  ctx.moveTo(0, SIZE / 2); ctx.lineTo(SIZE, SIZE / 2);
+  ctx.moveTo(SIZE / 2, 0); ctx.lineTo(SIZE / 2, SIZE);
+  ctx.stroke();
+  ctx.fillStyle = 'rgba(120,118,114,0.4)';
+  for (const [x, y] of [[SIZE * 0.25, SIZE * 0.25], [SIZE * 0.75, SIZE * 0.25], [SIZE * 0.25, SIZE * 0.75], [SIZE * 0.75, SIZE * 0.75]]) {
+    ctx.beginPath(); ctx.arc(x, y, 3.5, 0, Math.PI * 2); ctx.fill();
+  }
+});
+
+/** Gestapelte Holzscheiter der Scheiterwand hinter dem Flammengrill. */
+export const holzscheiter = () => make('holzscheiter', 1.0, 0.9, (ctx) => {
+  ctx.fillStyle = 'rgb(48,38,30)';
+  ctx.fillRect(0, 0, SIZE, SIZE);
+  const rnd = mulberry32(67);
+  for (let i = 0; i < 260; i++) {
+    const r = 12 + rnd() * 16;
+    const x = rnd() * SIZE, y = rnd() * SIZE;
+    const v = 128 + rnd() * 74;
+    ctx.fillStyle = `rgb(${v | 0},${(v - 26) | 0},${(v - 56) | 0})`;
+    ctx.beginPath(); ctx.arc(x, y, r, 0, Math.PI * 2); ctx.fill();
+    ctx.strokeStyle = 'rgba(60,44,32,0.75)';
+    ctx.lineWidth = 2;
+    ctx.stroke();
+    ctx.strokeStyle = 'rgba(90,66,46,0.5)';
+    ctx.lineWidth = 1;
+    for (let k = 1; k <= 2; k++) {
+      ctx.beginPath(); ctx.arc(x, y, (r * k) / 3, 0, Math.PI * 2); ctx.stroke();
+    }
+  }
+});
+
+/** Vertikale Holzschalung der Fassade - graubraun vergraut, wie auf den Fotos. */
+export const fassadeHolz = () => make('fassadeHolz', 1.2, 0.78, (ctx) => {
+  const px = SIZE / 1.2;
+  ctx.fillStyle = 'rgb(124,114,100)';
+  ctx.fillRect(0, 0, SIZE, SIZE);
+  const rnd = mulberry32(71);
+  const w = 0.06;
+  for (let col = 0; col < Math.round(1.2 / w); col++) {
+    const v = 152 + rnd() * 32;
+    ctx.fillStyle = `rgb(${v | 0},${(v - 8) | 0},${(v - 20) | 0})`;
+    ctx.fillRect(col * w * px + 1.5, 0, w * px - 3, SIZE);
+    ctx.strokeStyle = 'rgba(84,76,66,0.45)';
+    ctx.lineWidth = 1;
+    for (let i = 0; i < 14; i++) {
+      const y = rnd() * SIZE;
+      ctx.beginPath();
+      ctx.moveTo(col * w * px + 2, y);
+      ctx.lineTo(col * w * px + w * px - 3, y + (rnd() - 0.5) * 5);
+      ctx.stroke();
+    }
+  }
+  noiseTile(ctx, 72, 32, 0.03);
+});
+
+/** Heller Betonsockel unter der Holzschalung. */
+export const sockel = () => make('sockel', 2.0, 0.72, (ctx) => {
+  ctx.fillStyle = 'rgb(214,211,204)';
+  ctx.fillRect(0, 0, SIZE, SIZE);
+  noiseTile(ctx, 73, 16, 0.035);
+  grain(ctx, 74, 0.03, 1);
+});
+
+/** Extensive Dachbegruenung der Flachdaecher. */
+export const gruendach = () => make('gruendach', 2.0, 1.0, (ctx) => {
+  ctx.fillStyle = 'rgb(108,116,72)';
+  ctx.fillRect(0, 0, SIZE, SIZE);
+  noiseTile(ctx, 75, 18, 0.13);
+  const rnd = mulberry32(76);
+  for (let i = 0; i < 2800; i++) {
+    const v = rnd();
+    ctx.fillStyle = `rgba(${(96 + v * 80) | 0},${(112 + v * 60) | 0},${(58 + v * 40) | 0},0.75)`;
+    ctx.beginPath();
+    ctx.arc(rnd() * SIZE, rnd() * SIZE, 1.5 + rnd() * 3.5, 0, Math.PI * 2);
+    ctx.fill();
+  }
+});
+
+/** Dunkler Spritzschutz-Kiesstreifen entlang der Fassade (siehe Fotos). */
+export const spritzschutz = () => make('spritzschutz', 1.0, 0.98, (ctx) => {
+  ctx.fillStyle = 'rgb(62,62,66)';
+  ctx.fillRect(0, 0, SIZE, SIZE);
+  const rnd = mulberry32(77);
+  for (let i = 0; i < 4200; i++) {
+    const v = 52 + rnd() * 78;
+    ctx.fillStyle = `rgb(${v | 0},${v | 0},${(v + 6) | 0})`;
+    ctx.beginPath();
+    ctx.ellipse(rnd() * SIZE, rnd() * SIZE, 2 + rnd() * 4, 2 + rnd() * 3, rnd() * 3.14, 0, Math.PI * 2);
+    ctx.fill();
+  }
+});
diff --git a/src/scene/vegetation.ts b/src/scene/vegetation.ts
new file mode 100644
index 0000000..55f4903
--- /dev/null
+++ b/src/scene/vegetation.ts
@@ -0,0 +1,225 @@
+/**
+ * Bepflanzung: Solitaergehoelze, Eibenhecke `Hilli`, Beerenstraeucher,
+ * Graeser, Kraeuter und die Ligusterhecke des Nachbargartens.
+ *
+ * Der Stil ist bewusst stilisiert: klare Volumen mit leichter Unregelmaessigkeit
+ * statt Blattgeometrie - das bleibt auch auf dem Handy fluessig.
+ */
+import {
+  BoxGeometry, BufferAttribute, Color, CylinderGeometry, Group, IcosahedronGeometry,
+  InstancedMesh, Matrix4, Mesh, MeshStandardMaterial, Object3D, Quaternion, Vector3,
+  type BufferGeometry,
+} from 'three';
+import type { Plant, Tree } from '../site';
+import { boxGeometry } from './geometry';
+
+function rng(seed: number) {
+  let a = seed >>> 0;
+  return () => {
+    a = (a + 0x9e3779b9) >>> 0;
+    let t = Math.imul(a ^ (a >>> 16), 0x21f0aaad);
+    t = Math.imul(t ^ (t >>> 15), 0x735a2d97);
+    return ((t ^ (t >>> 15)) >>> 0) / 4294967296;
+  };
+}
+
+/**
+ * Kugel mit verrauschter Oberflaeche - Grundform aller Kronen und Polster.
+ * `stretchY` staucht oder streckt die Form bereits in der Geometrie. Das ist
+ * wichtig: eine ungleichmaessige Instanz-Skalierung verzerrt die Normalen und
+ * erzeugt harte, glaenzende Kanten.
+ */
+function blob(radius: number, detail: number, roughness: number, seed: number, stretchY = 1): BufferGeometry {
+  const g = new IcosahedronGeometry(radius, detail);
+  const pos = g.getAttribute('position') as BufferAttribute;
+  const r = rng(seed);
+  const v = new Vector3();
+  for (let i = 0; i < pos.count; i++) {
+    v.fromBufferAttribute(pos, i);
+    const f = 1 + (r() - 0.5) * 2 * roughness;
+    v.multiplyScalar(f);
+    pos.setXYZ(i, v.x, v.y * stretchY, v.z);
+  }
+  g.computeVertexNormals();
+  return g;
+}
+
+const LAUB = {
+  parrotia: 0x76944f,
+  apfel: 0x7e9c52,
+  eibe: 0x466b3a,
+  strauch: 0x6b8f45,
+  gras: 0xa3b45c,
+  kraut: 0x8ba455,
+  liguster: 0x557a37,
+};
+
+function foliage(color: number, rough = 0.92, flat = false) {
+  return new MeshStandardMaterial({ color, roughness: rough, metalness: 0, flatShading: flat });
+}
+
+const RINDE = new MeshStandardMaterial({ color: 0x7d6d59, roughness: 0.9 });
+
+/** Solitaergehoelz oder Baum: mehrstaemmig, mit gestapelten Kronenblasen. */
+function buildTree(t: Tree, y: number): Group {
+  const g = new Group();
+  g.name = t.name;
+  const r = rng(Math.round((t.x + 100) * 37 + (t.z + 100) * 91));
+  const crownR = Math.max(0.9, t.crown);
+  const trunkH = t.height * 0.42;
+
+  const stems = t.species === 'parrotia' ? 3 : 1;
+  for (let s = 0; s < stems; s++) {
+    const lean = stems > 1 ? 0.13 : 0;
+    const ox = (r() - 0.5) * 2 * lean * trunkH;
+    const oz = (r() - 0.5) * 2 * lean * trunkH;
+    const geo = new CylinderGeometry(0.05 + r() * 0.015, 0.075 + r() * 0.02, trunkH, 9, 1);
+    const m = new Mesh(geo, RINDE);
+    m.position.set(t.x + ox / 2, y + trunkH / 2, t.z + oz / 2);
+    m.rotation.z = ox / trunkH;
+    m.rotation.x = -oz / trunkH;
+    m.castShadow = true;
+    g.add(m);
+  }
+
+  // Krone aus mehreren, leicht unterschiedlich getoenten Blasen
+  const blobs = 5 + Math.round(r() * 2);
+  for (let i = 0; i < blobs; i++) {
+    const rr = crownR * (0.6 + r() * 0.35);
+    const geo = blob(rr, 2, 0.07, i * 17 + 5);
+    const shade = 1 - r() * 0.16;
+    const mat = foliage(
+      new Color(LAUB[t.species]).multiplyScalar(shade).getHex(),
+      0.94,
+    );
+    const m = new Mesh(geo, mat);
+    const a = (i / blobs) * Math.PI * 2 + r();
+    const rad = crownR * 0.3 * (i === 0 ? 0 : 1);
+    m.position.set(
+      t.x + Math.cos(a) * rad,
+      y + trunkH + crownR * (0.4 + r() * 0.45),
+      t.z + Math.sin(a) * rad,
+    );
+    m.scale.y = 0.86;
+    m.castShadow = true;
+    m.receiveShadow = true;
+    g.add(m);
+  }
+  return g;
+}
+
+/** Baut eine InstancedMesh aus Transformationen. */
+function instances(
+  geo: BufferGeometry, mat: MeshStandardMaterial,
+  items: { x: number; y: number; z: number; s: number; sy?: number; rot?: number }[],
+  name: string,
+): InstancedMesh | null {
+  if (!items.length) return null;
+  const mesh = new InstancedMesh(geo, mat, items.length);
+  const m = new Matrix4();
+  const q = new Quaternion();
+  const pos = new Vector3();
+  const scale = new Vector3();
+  const dummy = new Object3D();
+  items.forEach((it, i) => {
+    pos.set(it.x, it.y, it.z);
+    dummy.rotation.set(0, it.rot ?? 0, 0);
+    q.setFromEuler(dummy.rotation);
+    scale.set(it.s, it.sy ?? it.s, it.s);
+    m.compose(pos, q, scale);
+    mesh.setMatrixAt(i, m);
+  });
+  mesh.instanceMatrix.needsUpdate = true;
+  mesh.castShadow = true;
+  mesh.receiveShadow = true;
+  mesh.name = name;
+  return mesh;
+}
+
+export function buildVegetation(
+  plants: Plant[],
+  trees: Tree[],
+  height: (x: number, z: number) => number,
+): Group {
+  const group = new Group();
+  group.name = 'Bepflanzung';
+
+  for (const t of trees) group.add(buildTree(t, height(t.x, t.z)));
+
+  const r = rng(4242);
+
+  // --- Eiben `Hilli` 80/100 cm: aufrechte, dichte Polster ------------------
+  // Plan: Pflanzhoehe 80/100 cm, Breite rund 45 cm. Die Streckung steckt in
+  // der Geometrie, die Instanzen werden nur gleichmaessig skaliert.
+  const eiben = plants.filter((p) => p.type === 'eibe' && p.x !== undefined);
+  const eibeGeo = blob(1, 2, 0.028, 3, 1.9);
+  const eibeMesh = instances(eibeGeo, foliage(LAUB.eibe, 0.96), eiben.map((p) => {
+    const s = Math.max(0.22, (p.r ?? 0.2) * 1.1) * (0.92 + r() * 0.18);
+    return { x: p.x!, y: height(p.x!, p.z!) + s * 1.9, z: p.z!, s, rot: r() * 6.28 };
+  }), 'Eiben `Hilli`');
+  if (eibeMesh) group.add(eibeMesh);
+
+  // --- Beerenstraeucher und Heidelbeeren ----------------------------------
+  const straeucher = plants.filter((p) => p.type === 'strauch' && p.x !== undefined);
+  const strauchMesh = instances(blob(1, 2, 0.06, 7, 0.8), foliage(LAUB.strauch), straeucher.map((p) => {
+    const s = (p.r ?? 0.35) * 1.1;
+    return { x: p.x!, y: height(p.x!, p.z!) + s * 0.75, z: p.z!, s, rot: r() * 6.28 };
+  }), 'Beerensträucher');
+  if (strauchMesh) group.add(strauchMesh);
+
+  // --- Graeser: Buendel schmaler, leicht geneigter Halme -------------------
+  const graeser = plants.filter((p) => p.type === 'gras' && p.x !== undefined);
+  if (graeser.length) {
+    // Ein Halm als Einheitsgeometrie mit Fusspunkt im Ursprung; Neigung und
+    // Position kommen aus der Instanzmatrix, nicht aus einer Mesh-Rotation.
+    const blade = new BoxGeometry(0.022, 1, 0.022);
+    blade.translate(0, 0.5, 0);
+    const mesh = new InstancedMesh(blade, foliage(LAUB.gras, 0.98), graeser.length * 9);
+    const dummy = new Object3D();
+    let k = 0;
+    for (const p of graeser) {
+      const y = height(p.x!, p.z!);
+      for (let i = 0; i < 9; i++) {
+        const a = r() * Math.PI * 2;
+        const rad = (p.r ?? 0.12) * r() * 0.9;
+        dummy.position.set(p.x! + Math.cos(a) * rad, y, p.z! + Math.sin(a) * rad);
+        dummy.rotation.set((r() - 0.5) * 0.45, r() * Math.PI, (r() - 0.5) * 0.45);
+        dummy.scale.set(1, 0.42 + r() * 0.4, 1);
+        dummy.updateMatrix();
+        mesh.setMatrixAt(k++, dummy.matrix);
+      }
+    }
+    mesh.count = k;
+    mesh.instanceMatrix.needsUpdate = true;
+    mesh.castShadow = true;
+    mesh.name = 'Gräser';
+    group.add(mesh);
+  }
+
+  // --- Kraeuter und Stauden -----------------------------------------------
+  const kraeuter = plants.filter((p) => p.type === 'kraut' && p.x !== undefined);
+  const krautMesh = instances(blob(1, 2, 0.10, 11, 0.7), foliage(LAUB.kraut, 0.98), kraeuter.map((p) => {
+    const rr = Math.max(0.10, (p.r ?? 0.14) * 0.85);
+    return { x: p.x!, y: height(p.x!, p.z!) + rr * 0.5, z: p.z!, s: rr, rot: r() * 6.28 };
+  }), 'Kräuter');
+  if (krautMesh) group.add(krautMesh);
+
+  // --- Ligusterhecke, Hoehe 170 cm, Breite 75 cm --------------------------
+  for (const p of plants) {
+    if (p.type !== 'hecke' || !p.polygon) continue;
+    const poly = p.polygon;
+    let x0 = Infinity, z0 = Infinity, x1 = -Infinity, z1 = -Infinity;
+    for (const [x, z] of poly) { x0 = Math.min(x0, x); x1 = Math.max(x1, x); z0 = Math.min(z0, z); z1 = Math.max(z1, z); }
+    const cx = (x0 + x1) / 2, cz = (z0 + z1) / 2;
+    const y = height(cx, cz);
+    const h = p.height ?? 1.7;
+    const geo = boxGeometry(cx, cz, x1 - x0, z1 - z0, y, y + h, 0, 0.8);
+    const m = new Mesh(geo, foliage(LAUB.liguster, 0.97));
+    m.castShadow = true;
+    m.receiveShadow = true;
+    m.name = 'Ligusterhecke';
+    group.add(m);
+  }
+
+  return group;
+}
diff --git a/src/site.ts b/src/site.ts
new file mode 100644
index 0000000..22a2f1d
--- /dev/null
+++ b/src/site.ts
@@ -0,0 +1,179 @@
+/**
+ * Datenmodell der Szene. Entspricht public/data/site.json, das aus dem
+ * Gartenplan-PDF erzeugt wird (siehe tools/build-site.mjs).
+ *
+ * Koordinaten durchwegs in Metern im Site-Frame:
+ *   x = Hausachse ENE (Peilung 61.16 Grad), z = senkrecht SSE, y = Hoehe
+ *   y = 0 entspricht dem Fixpunkt 651.17 m ue. M. (OK Fertigboden EG Haus 9a)
+ */
+
+export type Vec2 = [number, number];
+
+export type SurfaceType =
+  | 'travertin80' | 'travertin4060' | 'travertinstell' | 'keramik'
+  | 'verbundstein' | 'tegula' | 'rasen' | 'schotterwiese' | 'beet' | 'spielsand';
+
+export interface Surface {
+  type: SurfaceType;
+  area: number;
+  polygon: Vec2[];
+}
+
+export interface Plant {
+  type: 'eibe' | 'strauch' | 'gras' | 'kraut' | 'hecke';
+  x?: number;
+  z?: number;
+  r?: number;
+  kind?: string;
+  height?: number;
+  width?: number;
+  polygon?: Vec2[];
+}
+
+export interface Tree {
+  name: string;
+  x: number;
+  z: number;
+  crown: number;
+  height: number;
+  species: 'parrotia' | 'apfel';
+  neighbour?: boolean;
+}
+
+export interface Lamp {
+  x: number;
+  z: number;
+  kind: 'poller' | 'boden';
+}
+
+export interface Wall {
+  id: string;
+  type: 'travertin' | 'beton' | 'holzscheiter' | 'lamellen';
+  note?: string;
+  path: Vec2[];
+  t: number;
+  top: number | null;
+  base: number | null;
+  seating?: boolean;
+  openSlats?: boolean;
+  retains?: string;
+  crestProfile?: number[];
+  footProfile?: number[];
+}
+
+export interface Prop {
+  id: string;
+  type: 'gartenhaus' | 'spielhaus' | 'flammengrill' | 'bank' | 'roboter' | 'wasserhahn' | 'schacht' | 'tor';
+  x: number;
+  z: number;
+  w: number;
+  d: number;
+  h: number;
+  rot: number;
+  note?: string;
+}
+
+export interface Stele { x: number; z: number; h: number }
+
+export interface Opening {
+  face: 'north' | 'south' | 'east' | 'west';
+  a: number;
+  b: number;
+  sill: number;
+  head: number;
+  kind: 'glass' | 'window' | 'door' | 'slats';
+  upper?: boolean;
+}
+
+export interface Building {
+  id: string;
+  name: string;
+  floorLevel: number;
+  upperLevel: number;
+  roofLevel: number;
+  parapet: number;
+  outline: Vec2[];
+  loggia: { x0: number; z0: number; x1: number; z1: number; ceiling: number };
+  canopy: { a: number; b: number; depth: number; y: number; thickness: number };
+  openings: Opening[];
+}
+
+export interface NeighbourBuilding {
+  id: string;
+  name: string;
+  outline: Vec2[];
+  floorLevel: number;
+  roofLevel: number;
+}
+
+export interface StartView {
+  id: string;
+  label: string;
+  x: number;
+  z: number;
+  yaw: number;
+  note?: string;
+}
+
+export interface Terrain {
+  grid: { x0: number; z0: number; cell: number; nx: number; nz: number };
+  heights: number[];
+  zones: { id: string; label: string; polygon: Vec2[] }[];
+  spots: { x: number; z: number; y: number; zone: string }[];
+}
+
+export interface SiteData {
+  meta: {
+    plan: string;
+    architecture: string;
+    generated: string;
+    originAbsoluteMasl: number;
+    location: {
+      name: string;
+      lat: number;
+      lon: number;
+      northBearingOfSiteX: number;
+      groundMasl: number;
+    };
+  };
+  terrain: Terrain;
+  surfaces: Surface[];
+  plants: Plant[];
+  trees: Tree[];
+  lamps: Lamp[];
+  walls: Wall[];
+  props: Prop[];
+  stelen: Stele[];
+  building: Building;
+  neighbourBuildings: NeighbourBuilding[];
+  startViews: StartView[];
+}
+
+export async function loadSite(url = './data/site.json'): Promise<SiteData> {
+  const res = await fetch(url);
+  if (!res.ok) throw new Error(`site.json konnte nicht geladen werden (${res.status})`);
+  return (await res.json()) as SiteData;
+}
+
+/**
+ * Bilineare Hoeheninterpolation im Raster. Ausserhalb des Rasters wird der
+ * Randwert gehalten, damit die Szene nirgends ins Leere faellt.
+ */
+export function makeHeightSampler(terrain: Terrain): (x: number, z: number) => number {
+  const { x0, z0, cell, nx, nz } = terrain.grid;
+  const h = Float32Array.from(terrain.heights);
+  return (x: number, z: number) => {
+    const fi = (x - x0) / cell;
+    const fj = (z - z0) / cell;
+    const i = Math.max(0, Math.min(nx - 2, Math.floor(fi)));
+    const j = Math.max(0, Math.min(nz - 2, Math.floor(fj)));
+    const tx = Math.max(0, Math.min(1, fi - i));
+    const tz = Math.max(0, Math.min(1, fj - j));
+    const h00 = h[j * nx + i], h10 = h[j * nx + i + 1];
+    const h01 = h[(j + 1) * nx + i], h11 = h[(j + 1) * nx + i + 1];
+    return (
+      h00 * (1 - tx) * (1 - tz) + h10 * tx * (1 - tz) +
+      h01 * (1 - tx) * tz + h11 * tx * tz
+    );
+  };
+}
diff --git a/src/style.css b/src/style.css
new file mode 100644
index 0000000..1d282b6
--- /dev/null
+++ b/src/style.css
@@ -0,0 +1,230 @@
+:root {
+  --ink: #1d241c;
+  --paper: rgba(250, 249, 245, 0.92);
+  --line: rgba(29, 36, 28, 0.14);
+  --accent: #6f8f3f;
+  --shadow: 0 6px 24px rgba(20, 28, 18, 0.22);
+  --radius: 12px;
+  font-family: "Segoe UI", system-ui, -apple-system, "Helvetica Neue", sans-serif;
+}
+
+* { box-sizing: border-box; }
+
+html, body {
+  margin: 0;
+  height: 100%;
+  overflow: hidden;
+  background: #10150f;
+  color: var(--ink);
+  -webkit-tap-highlight-color: transparent;
+}
+
+#view {
+  position: fixed;
+  inset: 0;
+  width: 100%;
+  height: 100%;
+  display: block;
+  touch-action: none;
+  cursor: grab;
+}
+
+/* -- Ladeanzeige ---------------------------------------------------------- */
+
+#loader {
+  position: fixed;
+  inset: 0;
+  display: grid;
+  place-items: center;
+  background: linear-gradient(170deg, #3d5238, #1b2418 70%);
+  color: #f2f4ec;
+  z-index: 50;
+  transition: opacity 0.5s ease;
+}
+
+#loader.done { opacity: 0; pointer-events: none; }
+
+.loader-inner { width: min(320px, 76vw); text-align: center; }
+.loader-title { font-size: 1.05rem; font-weight: 600; letter-spacing: 0.01em; margin-bottom: 1rem; }
+.loader-bar { height: 3px; background: rgba(255, 255, 255, 0.18); border-radius: 3px; overflow: hidden; }
+.loader-bar span { display: block; height: 100%; width: 0; background: #b9d08a; transition: width 0.3s ease; }
+.loader-note { margin-top: 0.7rem; font-size: 0.8rem; opacity: 0.72; }
+
+/* -- Bedienoberflaeche ---------------------------------------------------- */
+
+#hud { position: fixed; inset: 0; pointer-events: none; z-index: 10; }
+#hud button, #hud input, #hud a { pointer-events: auto; }
+
+#topbar {
+  position: absolute;
+  top: 0; left: 0; right: 0;
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  gap: 1rem;
+  padding: 0.7rem clamp(0.7rem, 2vw, 1.3rem);
+  padding-top: max(0.7rem, env(safe-area-inset-top));
+  background: linear-gradient(to bottom, rgba(12, 18, 10, 0.62), rgba(12, 18, 10, 0));
+  color: #f4f6ee;
+}
+
+.brand { display: flex; flex-direction: column; line-height: 1.32; text-shadow: 0 1px 3px rgba(0, 0, 0, 0.5); }
+.brand strong { font-size: 0.95rem; font-weight: 600; }
+.brand span { font-size: 0.72rem; opacity: 0.8; }
+
+.topbar-actions { display: flex; gap: 0.5rem; }
+
+#hud button {
+  font: inherit;
+  font-size: 0.78rem;
+  padding: 0.42rem 0.85rem;
+  border: 1px solid rgba(255, 255, 255, 0.28);
+  border-radius: 999px;
+  background: rgba(14, 20, 12, 0.45);
+  color: #f4f6ee;
+  cursor: pointer;
+  backdrop-filter: blur(6px);
+  transition: background 0.15s ease, border-color 0.15s ease;
+}
+#hud button:hover { background: rgba(30, 42, 24, 0.7); border-color: rgba(255, 255, 255, 0.5); }
+#hud button[aria-pressed="true"] { background: var(--accent); border-color: var(--accent); color: #fff; }
+
+#views {
+  position: absolute;
+  left: 50%;
+  transform: translateX(-50%);
+  bottom: max(0.8rem, env(safe-area-inset-bottom));
+  display: flex;
+  gap: 0.4rem;
+  padding: 0 0.6rem;
+  max-width: 96vw;
+  overflow-x: auto;
+  scrollbar-width: none;
+}
+#views::-webkit-scrollbar { display: none; }
+#views button { white-space: nowrap; }
+
+#timebar {
+  position: absolute;
+  right: clamp(0.7rem, 2vw, 1.3rem);
+  top: 4.2rem;
+  width: min(230px, 46vw);
+  display: grid;
+  gap: 0.15rem;
+  padding: 0.7rem 0.85rem;
+  border-radius: var(--radius);
+  background: rgba(14, 20, 12, 0.42);
+  backdrop-filter: blur(8px);
+  color: #eef1e6;
+  font-size: 0.72rem;
+  box-shadow: var(--shadow);
+}
+#timebar label { display: flex; justify-content: space-between; opacity: 0.85; }
+#timebar output { font-variant-numeric: tabular-nums; font-weight: 600; }
+#timebar input { width: 100%; accent-color: var(--accent); margin: 0 0 0.45rem; }
+
+#crosshair {
+  position: absolute;
+  left: 50%; top: 50%;
+  width: 5px; height: 5px;
+  margin: -2.5px 0 0 -2.5px;
+  border-radius: 50%;
+  background: rgba(255, 255, 255, 0.55);
+  box-shadow: 0 0 0 1px rgba(0, 0, 0, 0.35);
+  opacity: 0;
+  transition: opacity 0.2s ease;
+}
+#crosshair.on { opacity: 1; }
+
+#hint {
+  position: absolute;
+  left: 50%;
+  transform: translateX(-50%);
+  bottom: 3.4rem;
+  padding: 0.4rem 0.9rem;
+  border-radius: 999px;
+  background: rgba(14, 20, 12, 0.5);
+  color: #eef1e6;
+  font-size: 0.72rem;
+  white-space: nowrap;
+  backdrop-filter: blur(6px);
+  transition: opacity 0.4s ease;
+}
+#hint.fade { opacity: 0; }
+#hint kbd {
+  font: inherit;
+  padding: 0.02em 0.34em;
+  margin: 0 0.06em;
+  border: 1px solid rgba(255, 255, 255, 0.35);
+  border-radius: 4px;
+}
+#hint .touch { display: none; }
+
+#joystick {
+  position: absolute;
+  left: 1.3rem;
+  bottom: max(4.6rem, calc(env(safe-area-inset-bottom) + 4.4rem));
+  width: 116px;
+  height: 116px;
+  border-radius: 50%;
+  border: 1px solid rgba(255, 255, 255, 0.3);
+  background: rgba(14, 20, 12, 0.3);
+  pointer-events: auto;
+  touch-action: none;
+}
+#joystick-knob {
+  position: absolute;
+  left: 50%; top: 50%;
+  width: 46px; height: 46px;
+  margin: -23px 0 0 -23px;
+  border-radius: 50%;
+  background: rgba(240, 244, 232, 0.7);
+  box-shadow: var(--shadow);
+}
+
+#info {
+  position: absolute;
+  right: clamp(0.7rem, 2vw, 1.3rem);
+  top: 4.2rem;
+  width: min(390px, 88vw);
+  max-height: min(72vh, 640px);
+  overflow-y: auto;
+  padding: 1.1rem 1.25rem 1.3rem;
+  border-radius: var(--radius);
+  background: var(--paper);
+  box-shadow: var(--shadow);
+  pointer-events: auto;
+  font-size: 0.82rem;
+  line-height: 1.55;
+}
+#info h2 { margin: 0 0 0.6rem; font-size: 1rem; }
+#info h3 { margin: 1.1rem 0 0.3rem; font-size: 0.82rem; text-transform: uppercase; letter-spacing: 0.06em; color: #5d6a55; }
+#info p { margin: 0 0 0.5rem; }
+#info dl { display: grid; grid-template-columns: auto 1fr; gap: 0.15rem 0.8rem; margin: 0; }
+#info dt { color: #5d6a55; }
+#info dd { margin: 0; font-variant-numeric: tabular-nums; }
+#info ul { margin: 0.2rem 0 0.6rem; padding-left: 1.1rem; }
+#info li { margin-bottom: 0.15rem; }
+#info-close {
+  position: absolute;
+  right: 0.55rem; top: 0.5rem;
+  width: 28px; height: 28px;
+  padding: 0 !important;
+  font-size: 1.1rem !important;
+  line-height: 1;
+  border-color: var(--line) !important;
+  background: transparent !important;
+  color: var(--ink) !important;
+}
+
+@media (pointer: coarse) {
+  #hint .desktop { display: none; }
+  #hint .touch { display: inline; }
+  #timebar { top: auto; bottom: max(9.5rem, calc(env(safe-area-inset-bottom) + 9rem)); width: min(200px, 44vw); }
+  #hint { bottom: 8.2rem; font-size: 0.68rem; }
+  #views { bottom: max(0.6rem, env(safe-area-inset-bottom)); justify-content: flex-start; }
+}
+
+@media (max-width: 560px) {
+  .brand span { display: none; }
+}
diff --git a/src/ui/hud.ts b/src/ui/hud.ts
new file mode 100644
index 0000000..8c74c6b
--- /dev/null
+++ b/src/ui/hud.ts
@@ -0,0 +1,203 @@
+/**
+ * Bedienoberflaeche: Standorte, Tageszeit, Modusumschaltung, Joystick, Infobox.
+ */
+import type { SiteData, StartView } from '../site';
+import type { SunState } from '../scene/environment';
+import { isTouch } from '../controls/walker';
+
+export interface HudOptions {
+  site: SiteData;
+  onView(view: StartView): void;
+  onMode(mode: 'walk' | 'overview'): void;
+  onJoystick(x: number, y: number, active: boolean): void;
+}
+
+export interface Hud {
+  time(): { hours: number; day: number };
+  setMode(mode: 'walk' | 'overview'): void;
+  setPointerLocked(locked: boolean): void;
+  setSunReadout(sun: SunState): void;
+}
+
+const MONTHS = ['Januar', 'Februar', 'März', 'April', 'Mai', 'Juni', 'Juli', 'August', 'September', 'Oktober', 'November', 'Dezember'];
+
+function dayLabel(dayOfYear: number): string {
+  const d = new Date(2026, 0, 1);
+  d.setDate(dayOfYear);
+  return `${d.getDate()}. ${MONTHS[d.getMonth()]}`;
+}
+
+function timeLabel(hours: number): string {
+  const h = Math.floor(hours);
+  const m = Math.round((hours - h) * 60);
+  return `${String(h).padStart(2, '0')}:${String(m).padStart(2, '0')}`;
+}
+
+export function setupHud(opts: HudOptions): Hud {
+  const { site } = opts;
+  const $ = <T extends HTMLElement>(id: string) => document.getElementById(id) as T;
+
+  const timeInput = $<HTMLInputElement>('time');
+  const timeOut = $<HTMLOutputElement>('time-out');
+  const seasonInput = $<HTMLInputElement>('season');
+  const seasonOut = $<HTMLOutputElement>('season-out');
+  const btnMode = $<HTMLButtonElement>('btn-mode');
+  const btnInfo = $<HTMLButtonElement>('btn-info');
+  const info = $<HTMLElement>('info');
+  const crosshair = $<HTMLElement>('crosshair');
+  const hint = $<HTMLElement>('hint');
+
+  // -- Standorte -----------------------------------------------------------
+  const nav = $<HTMLElement>('views');
+  for (const v of site.startViews) {
+    const btn = document.createElement('button');
+    btn.type = 'button';
+    btn.textContent = v.label;
+    if (v.note) btn.title = v.note;
+    btn.addEventListener('click', () => {
+      for (const other of nav.querySelectorAll('button')) other.removeAttribute('aria-pressed');
+      btn.setAttribute('aria-pressed', 'true');
+      opts.onView(v);
+    });
+    nav.append(btn);
+  }
+  nav.querySelector('button')?.setAttribute('aria-pressed', 'true');
+
+  // -- Tageszeit -----------------------------------------------------------
+  const syncTime = () => {
+    timeOut.value = timeLabel(+timeInput.value);
+    seasonOut.value = dayLabel(+seasonInput.value);
+  };
+  timeInput.addEventListener('input', syncTime);
+  seasonInput.addEventListener('input', syncTime);
+  syncTime();
+
+  // -- Modus ---------------------------------------------------------------
+  let mode: 'walk' | 'overview' = 'walk';
+  const setMode = (next: 'walk' | 'overview') => {
+    mode = next;
+    btnMode.textContent = mode === 'walk' ? 'Übersicht' : 'Rundgang';
+    btnMode.setAttribute('aria-pressed', String(mode === 'overview'));
+    hint.style.display = mode === 'overview' ? 'none' : '';
+    opts.onMode(mode);
+  };
+  btnMode.addEventListener('click', () => setMode(mode === 'walk' ? 'overview' : 'walk'));
+
+  // -- Infobox -------------------------------------------------------------
+  const totals = new Map<string, number>();
+  for (const s of site.surfaces) totals.set(s.type, (totals.get(s.type) ?? 0) + s.area);
+  const NAMES: Record<string, string> = {
+    travertin80: 'Travertinplatten 80×80×3 cm',
+    travertin4060: 'Travertinplatten 40×60×3 cm',
+    travertinstell: 'Travertinstellplatten',
+    keramik: 'Keramikplatten 60×60×2 cm',
+    verbundstein: 'Verbundsteine (Nachbar)',
+    tegula: 'Tegula-Pflastersteine grau',
+    rasen: 'Rasen',
+    schotterwiese: 'Schotterwiese',
+    beet: 'Pflanzbeete',
+    spielsand: 'Spielsand',
+  };
+  const heights = site.terrain.spots.filter((s) => s.zone === 'garten').map((s) => s.y);
+  const eibenCount = site.plants.filter((p) => p.type === 'eibe').length;
+
+  $<HTMLElement>('info-body').innerHTML = `
+    <p>Alle Flächen, Mauern und Pflanzstandorte sind massstäblich aus dem Gartenplan
+    übernommen. Die Vektorgeometrie wurde direkt aus dem Plan-PDF (1:100) extrahiert,
+    das Gelände aus den ${site.terrain.spots.length} Höhenkoten interpoliert.</p>
+
+    <h3>Grundlagen</h3>
+    <dl>
+      <dt>Gartenplan</dt><dd>${site.meta.plan}</dd>
+      <dt>Architektur</dt><dd>${site.meta.architecture}</dd>
+      <dt>Standort</dt><dd>${site.meta.location.name}</dd>
+      <dt>Fixpunkt 0.00</dt><dd>${site.meta.location.groundMasl.toFixed(2)} m ü. M. (OK FB EG)</dd>
+      <dt>Höhen im Garten</dt><dd>${Math.min(...heights).toFixed(2)} bis ${Math.max(...heights).toFixed(2)} m</dd>
+    </dl>
+
+    <h3>Beläge</h3>
+    <dl>${[...totals.entries()]
+      .sort((a, b) => b[1] - a[1])
+      .map(([k, v]) => `<dt>${NAMES[k] ?? k}</dt><dd>${v.toFixed(1)} m²</dd>`)
+      .join('')}</dl>
+
+    <h3>Bepflanzung und Ausstattung</h3>
+    <ul>
+      <li>${site.trees.length} Solitärgehölze und Bäume, inkl. Apfelbaum</li>
+      <li>${eibenCount} Eiben &bdquo;Hilli&ldquo; 80/100 cm als Heckenpflanzung</li>
+      <li>Ligusterhecke 170 cm hoch, 75 cm breit</li>
+      <li>${site.walls.length} Mauern und Wände, ${site.stelen.length} Travertinstelen</li>
+      <li>${site.lamps.length} Leuchten &ndash; sie schalten sich abends automatisch ein</li>
+      <li>Gartenhaus 1,8 × 1,8 m, Spielhaus, Flammengrill mit Holzscheiterwand</li>
+    </ul>
+
+    <h3>Bedienung</h3>
+    <ul>
+      <li>Rundgang: Klicken, dann <kbd>W</kbd> <kbd>A</kbd> <kbd>S</kbd> <kbd>D</kbd>, <kbd>Shift</kbd> zum Rennen</li>
+      <li>Am Handy: links der Joystick, rechts wischen zum Umsehen</li>
+      <li>Übersicht: ziehen zum Drehen, Mausrad zum Zoomen</li>
+      <li>Die Sonne steht für Abtwil SG astronomisch korrekt</li>
+    </ul>
+    <p id="sun-readout"></p>
+  `;
+
+  const toggleInfo = () => {
+    info.hidden = !info.hidden;
+    btnInfo.setAttribute('aria-pressed', String(!info.hidden));
+  };
+  btnInfo.addEventListener('click', toggleInfo);
+  $<HTMLButtonElement>('info-close').addEventListener('click', toggleInfo);
+
+  // -- Joystick ------------------------------------------------------------
+  if (isTouch()) {
+    const pad = $<HTMLElement>('joystick');
+    const knob = $<HTMLElement>('joystick-knob');
+    let id: number | null = null;
+    const radius = 36;
+    const reset = () => {
+      knob.style.transform = '';
+      opts.onJoystick(0, 0, false);
+      id = null;
+    };
+    pad.addEventListener('touchstart', (e) => {
+      e.preventDefault();
+      id = e.changedTouches[0].identifier;
+    }, { passive: false });
+    pad.addEventListener('touchmove', (e) => {
+      e.preventDefault();
+      for (const t of Array.from(e.changedTouches)) {
+        if (t.identifier !== id) continue;
+        const r = pad.getBoundingClientRect();
+        let dx = t.clientX - (r.left + r.width / 2);
+        let dy = t.clientY - (r.top + r.height / 2);
+        const len = Math.hypot(dx, dy);
+        if (len > radius) { dx = (dx / len) * radius; dy = (dy / len) * radius; }
+        knob.style.transform = `translate(${dx}px, ${dy}px)`;
+        opts.onJoystick(dx / radius, dy / radius, true);
+      }
+    }, { passive: false });
+    pad.addEventListener('touchend', reset, { passive: true });
+    pad.addEventListener('touchcancel', reset, { passive: true });
+  }
+
+  window.setTimeout(() => hint.classList.add('fade'), 9000);
+
+  return {
+    time: () => ({
+      hours: Math.round(+timeInput.value * 4) / 4,
+      day: +seasonInput.value,
+    }),
+    setMode,
+    setPointerLocked(locked) {
+      crosshair.classList.toggle('on', locked);
+      if (locked) hint.classList.add('fade');
+    },
+    setSunReadout(sun) {
+      const el = document.getElementById('sun-readout');
+      if (!el) return;
+      el.textContent = sun.altitude > 0
+        ? `Sonnenstand: ${sun.altitude.toFixed(0)}° über dem Horizont, Azimut ${sun.azimuth.toFixed(0)}°.`
+        : 'Die Sonne steht unter dem Horizont – die Gartenbeleuchtung ist eingeschaltet.';
+    },
+  };
+}
diff --git a/tools/authoring.mjs b/tools/authoring.mjs
new file mode 100644
index 0000000..2bc6eb0
--- /dev/null
+++ b/tools/authoring.mjs
@@ -0,0 +1,316 @@
+/**
+ * Handgepflegte Ergaenzungen zum Plan.
+ *
+ * Der PDF-Plan liefert Flaechen, Pflanzensymbole und Hoehenkoten. Alles, was
+ * im Plan nur beschriftet ist (Mauerhoehen, Bauteile, Gebaeude), steht hier -
+ * abgeleitet aus den Planbeschriftungen, den Architekturplaenen von EHLE
+ * Architekten (Haus 9a, 27.04.2021) und den Fotos des Ist-Zustands.
+ *
+ * Alle Koordinaten im Site-Frame in Metern:
+ *   X = Hausachse ENE (Peilung  61.16 deg)
+ *   Z = senkrecht SSE (Peilung 151.16 deg)
+ *   Y = Hoehe relativ zum Fixpunkt 0.00 = 651.17 m ue. M. (= OK FB EG Haus 9a)
+ */
+
+/** Farbe im Plan -> Belagsart. Reihenfolge egal, Zuordnung ueber Hex. */
+export const SURFACE_BY_COLOR = {
+  '#ffffcc': 'travertin80',   // Travertinplatten 80x80x3, Hauptsitzplatz West
+  '#fcffe7': 'travertin4060', // Travertinplatten 40x60x3 mit Dekorkies + Keramikterrasse Zollet
+  '#f8ffcc': 'travertinstell',// Travertinstellplatten-Streifen
+  '#eee8cc': 'travertinmauer',// Mauerkronen, Sitzmauern, schwebende Stufen
+  '#e5ffe5': 'rasen',
+  '#ccffcc': 'rasen',
+  '#ccff99': 'schotterwiese',
+  '#eeeeee': 'keramik',       // Keramikplatten 60x60x2 (bauseits vorhanden)
+  '#bbbbbb': 'verbundstein',  // Anpassung Verbundsteine Nachbar
+  '#ddba99': 'beet',
+  '#c0bab4': 'spielsand',
+  '#ffaa00': 'tegula',        // Tegula-Pflastersteine grau (im Plan orange markiert)
+  '#ddd299': 'travertinstell',
+  '#73e900': 'ligusterhecke',
+  '#cccccc': 'winkelelement',
+  '#aaaaaa': 'spielhaus',
+  '#b29f3c': 'spielhaus',
+  '#80712a': 'gartenhaus',
+  '#335533': 'roboter',
+};
+
+/** Pflanzensymbole: Planfarbe -> Art. Radius kommt aus dem Plankreis. */
+export const PLANT_BY_COLOR = {
+  '#00bb00': 'eibe',        // Eiben `Hilli` 80/100 cm - Heckenpflanzen und ein Solitaer
+  '#66ff33': 'solitaer',
+  '#33ff99': 'solitaer',
+  '#cc5599': 'solitaer',    // Parrotia persica, persischer Eisenholzbaum
+  '#99ff66': 'strauch',     // Heidelbeeren / Beerenstraeucher
+  '#7fff00': 'gras',
+  '#99ff00': 'kraut',
+  '#cbe900': 'kraut',
+  '#74ff63': 'kraut',
+  '#e8ff64': 'kraut',
+  '#59b500': 'kraut',
+  '#0c8e2d': 'kraut',
+  '#00e93c': 'kraut',
+  '#33ff66': 'kraut',
+  '#339966': 'kraut',
+  '#00dbdd': 'kraut',
+  '#ccccff': 'kraut',
+  '#ff66cc': 'kraut',
+  '#7863ff': 'kraut',
+};
+
+/**
+ * Solitaergehoelze und Baeume. Die Kronenradien stammen aus den Plankreisen,
+ * die Stammhoehen sind Erfahrungswerte fuer die im Plan gezeigten Groessen.
+ */
+export const TREES = [
+  { name: 'Solitärgehölz Sitzplatz Süd', x: -17.5, z: 1.6, crown: 1.34, height: 4.6, species: 'parrotia' },
+  { name: 'Solitärgehölz Terrasse NW', x: -19.1, z: -5.5, crown: 0.67, height: 3.2, species: 'parrotia' },
+  { name: 'Solitärgehölz Flammengrill', x: -4.0, z: 3.9, crown: 0.63, height: 3.0, species: 'parrotia' },
+  { name: 'Apfelbaum', x: 1.69, z: 4.05, crown: 0.9, height: 3.4, species: 'apfel' },
+  // Nachbargarten Zollet, im Plan mitgezeichnet
+  { name: 'Solitärgehölz Zollet', x: -17.6, z: -10.2, crown: 1.34, height: 4.6, species: 'parrotia', neighbour: true },
+];
+
+/**
+ * Mauern, Stuetzelemente und Waende.
+ * `path` = Mittellinie, `t` = Dicke, `top`/`base` = Hoehe der Krone bzw. des Fusses
+ * (null = folgt dem Gelaende). Alle Werte aus den Planbeschriftungen und Koten.
+ */
+export const WALLS = [
+  {
+    id: 'travertinmauer-nord', type: 'travertin',
+    note: 'Travertinmauer an der Grenze zum Nachbargrundstueck Zollet, stuetzt rund 1.5 m ab',
+    path: [[-18.17, -6.895], [-13.82, -6.895]], t: 0.55, top: -0.30, base: -1.90,
+  },
+  {
+    id: 'sitzmauer-nord', type: 'travertin',
+    note: 'Sitzmauer 25 cm ueber der Travertinmauer (gelbe Kote "25" im Plan)',
+    path: [[-20.08, -6.47], [-13.82, -6.47]], t: 0.30, top: -0.03, base: -0.45,
+  },
+  {
+    id: 'winkelelemente-west', type: 'beton',
+    note: 'Winkelelemente aus Beton entlang der Westgrenze, stuetzen den Garten ueber der Feuerwehrzufahrt',
+    path: [[-20.12, -6.62], [-20.66, 0.51], [-21.70, 0.52], [-21.70, 2.37]],
+    t: 0.22, top: null, base: null, retains: 'west',
+  },
+  {
+    id: 'travertinsitzmauer-west', type: 'travertin',
+    note: 'Travertinsitzmauer als Abschluss des Hauptsitzplatzes gegen den Rasen',
+    path: [[-18.64, 0.755], [-14.73, 0.755]], t: 0.41, top: 0.40, base: -0.45, seating: true,
+  },
+  {
+    id: 'travertinsitzmauer-sued', type: 'travertin',
+    note: 'Schenkel der Travertinsitzmauer laengs des Rasens',
+    path: [[-18.44, 0.55], [-18.44, 3.94]], t: 0.40, top: 0.40, base: -0.40, seating: true,
+  },
+  {
+    id: 'betonmauer-nachbar', type: 'beton',
+    note: 'Bestehende Betonmauer des Suednachbarn entlang der Grenze',
+    path: [[-17.41, 6.07], [1.99, 6.07]], t: 0.20, top: 1.10, base: -0.60,
+  },
+  {
+    id: 'betonmauer-nachbar-ost', type: 'beton',
+    note: 'Rueckspringender Schenkel der Nachbarmauer',
+    path: [[2.09, 6.07], [2.09, 9.05]], t: 0.20, top: 1.10, base: -0.60,
+  },
+  {
+    id: 'holzscheiterwand', type: 'holzscheiter',
+    note: 'Holzscheiterwand 150 x 200 cm hinter dem Flammengrill',
+    path: [[-5.75, 4.35], [-4.25, 4.35]], t: 0.45, top: 1.75, base: 0.26,
+  },
+  {
+    id: 'lamellenwand', type: 'lamellen',
+    note: 'Lamellenwand zum Sitzen: senkrechte Holzlamellen am gedeckten Sitzplatz',
+    path: [[-13.26, 0.91], [-8.73, 0.91]], t: 0.34, top: 2.72, base: -0.05, openSlats: true,
+  },
+];
+
+/** Freistehende Bauteile und Moeblierung. rot = Drehung um Y in Grad. */
+export const PROPS = [
+  { id: 'gartenhaus', type: 'gartenhaus', x: 1.20, z: -3.60, w: 1.8, d: 1.8, h: 2.15, rot: 0,
+    note: 'Standort Gartenhaus 1,8 x 1,8 m' },
+  { id: 'spielhaus', type: 'spielhaus', x: 0.0, z: 3.15, w: 1.8, d: 2.7, h: 2.30, rot: 0,
+    note: 'Spielhaus durch Zimmermann, Podest auf 1.47' },
+  { id: 'flammengrill', type: 'flammengrill', x: -6.95, z: 2.45, w: 0.7, d: 0.7, h: 0.85, rot: 0,
+    note: 'Flammengrill im Dekorkiesfeld' },
+  { id: 'baenkli', type: 'bank', x: -20.62, z: 1.42, w: 0.50, d: 1.50, h: 0.45, rot: 90,
+    note: 'Baenkli aus Travertin' },
+  { id: 'maehroboter', type: 'roboter', x: -17.87, z: 3.72, w: 0.75, d: 0.55, h: 0.40, rot: 0,
+    note: 'Garage Maehroboter' },
+  { id: 'wasserhahn', type: 'wasserhahn', x: -13.90, z: -4.60, w: 0.12, d: 0.12, h: 0.85, rot: 0 },
+  { id: 'schlaufschacht', type: 'schacht', x: -14.35, z: -3.95, w: 0.30, d: 0.30, h: 0.02, rot: 0,
+    note: 'Schlaufschacht D = 30 cm' },
+  { id: 'gartentor', type: 'tor', x: -21.60, z: 3.30, w: 1.00, d: 0.06, h: 1.10, rot: 0 },
+];
+
+/**
+ * Flaechen, die der Plan nur als weisses Raster zeigt und die deshalb bei der
+ * Farbklassierung durchfallen - Masse aus den Planlinien.
+ */
+export const EXTRA_SURFACES = [
+  {
+    type: 'keramik',
+    note: 'Gedeckter Sitzplatz 14.4 m2, Keramikplatten 60x60x2 cm',
+    polygon: [[-13.93, -3.06], [-8.73, -3.06], [-8.73, 0.86], [-13.93, 0.86]],
+  },
+  {
+    type: 'travertin80',
+    note: 'Schwebende Stufe Travertin, obere Tritthoehe -0.17',
+    polygon: [[-14.74, -2.69], [-13.93, -2.69], [-13.93, 0.56], [-14.74, 0.56]],
+  },
+  {
+    type: 'travertin80',
+    note: 'Schwebende Stufe Travertin, untere Tritthoehe -0.33',
+    polygon: [[-15.28, -3.08], [-14.48, -3.08], [-14.48, 0.12], [-15.28, 0.12]],
+  },
+  {
+    type: 'travertin80',
+    note: 'Schwebende Stufen beim Gartentor an der Suedwestecke',
+    polygon: [[-21.45, 2.15], [-20.65, 2.15], [-20.66, 3.75], [-21.45, 3.75]],
+  },
+  {
+    type: 'tegula',
+    note: 'Feuerwehrzufahrt und Zugangsweg, Tegula-Pflastersteine grau',
+    polygon: [[-25.60, -9.00], [-22.10, -9.00], [-22.10, 6.40], [-25.60, 6.40]],
+  },
+];
+
+/**
+ * Travertinstelen: aufrechte Steinstelen als Raumteiler entlang der Beete.
+ * Positionen aus den Planbeschriftungen "Travertinstelen".
+ */
+export const STELEN = [
+  { x: -19.55, z: -3.10, h: 0.90 }, { x: -19.30, z: -2.30, h: 1.15 }, { x: -19.05, z: -1.55, h: 0.75 },
+  { x: -13.30, z: 4.45, h: 1.05 }, { x: -12.60, z: 4.45, h: 0.80 }, { x: -10.30, z: 4.60, h: 1.10 },
+  { x: -9.60, z: 4.60, h: 0.85 }, { x: -1.30, z: 4.55, h: 1.00 }, { x: -0.60, z: 4.55, h: 0.75 },
+];
+
+/**
+ * Gebaeude. Das Wohnhaus 9a ist massgetreu aus dem Gartenplan uebernommen,
+ * die Hoehen stammen aus der Suedwest- und Nordostfassade 1:100:
+ *   OK FB EG   651.17 -> 0.00     OK FB OG   654.07 -> +2.90
+ *   OK Attika  657.32 -> +6.15    Nachbar Nr. 9 OK FB EG 649.47 -> -1.70
+ */
+export const BUILDING = {
+  id: 'haus-9a',
+  name: 'Haus 9a - Jeanine und Damian Kellenberger',
+  floorLevel: 0.0,
+  upperLevel: 2.9,
+  roofLevel: 6.15,
+  parapet: 0.35,
+  /**
+   * Aussenkante Fassade. Der Baukoerper ist im Grundriss ein Rechteck von
+   * 14.10 x 7.83 m; die Masse stammen aus den schwarzen Wandflaechen des
+   * Gartenplans (Nordostfassade z = -6.87, Suedwestfassade z = +0.96).
+   */
+  outline: [[-13.82, -6.87], [0.28, -6.87], [0.28, 0.96], [-13.82, 0.96]],
+  /**
+   * Gedeckter Sitzplatz 14.4 m2: im Erdgeschoss zurueckspringende Nische in
+   * der Suedwestecke, oben vom Obergeschoss ueberdeckt.
+   */
+  loggia: { x0: -13.82, z0: -3.06, x1: -9.06, z1: 0.96, ceiling: 2.75 },
+  /** Vordach ueber dem Hauseingang an der Nordostfassade (siehe Foto). */
+  canopy: { a: -3.20, b: 0.28, depth: 1.35, y: 2.60, thickness: 0.16 },
+  openings: [
+    // Suedwestfassade (z = 0.96 / 0.51) - grosse Fensterfronten zum Garten
+    { face: 'south', a: -4.40, b: -0.20, sill: 0.0, head: 2.45, kind: 'glass' },
+    { face: 'south', a: -12.90, b: -9.40, sill: 0.0, head: 2.45, kind: 'glass' },
+    { face: 'south', a: -3.90, b: -0.60, sill: 3.35, head: 5.00, kind: 'glass', upper: true },
+    { face: 'south', a: -12.60, b: -9.70, sill: 3.35, head: 5.00, kind: 'glass', upper: true },
+    // Westfassade (x = -13.82) - Fenster
+    { face: 'west', a: -5.84, b: -4.24, sill: 0.85, head: 2.35, kind: 'window' },
+    { face: 'west', a: -5.60, b: -4.50, sill: 3.75, head: 5.00, kind: 'window', upper: true },
+    // Nordostfassade (z = -6.87) - Eingang und Lamellenfenster
+    { face: 'north', a: -1.90, b: -0.90, sill: 0.0, head: 2.35, kind: 'door' },
+    { face: 'north', a: -5.60, b: -3.90, sill: 0.90, head: 2.35, kind: 'window' },
+    { face: 'north', a: -11.60, b: -10.20, sill: 0.90, head: 2.35, kind: 'slats' },
+    { face: 'north', a: -5.40, b: -4.10, sill: 3.75, head: 5.10, kind: 'window', upper: true },
+    { face: 'north', a: -11.40, b: -10.40, sill: 3.75, head: 5.10, kind: 'slats', upper: true },
+    // Ostfassade (x = 0.28)
+    { face: 'east', a: -5.60, b: -4.30, sill: 0.90, head: 2.35, kind: 'window' },
+  ],
+};
+
+/**
+ * Nachbargebaeude als Kontext-Volumen. Haus 9 (Zollet) haengt am gleichen
+ * Baukoerper, liegt aber 1.70 m tiefer und ist gegen Nordwesten versetzt.
+ */
+export const NEIGHBOUR_BUILDINGS = [
+  {
+    id: 'haus-9', name: 'Haus 9 - Sharon und Alan Zollet',
+    outline: [[-15.60, -13.60], [-1.20, -13.60], [-1.20, -6.87], [-15.60, -6.87]],
+    floorLevel: -1.70, roofLevel: 4.45,
+  },
+];
+
+/**
+ * Gelaendezonen. Innerhalb einer Zone wird zwischen den Hoehenkoten
+ * interpoliert; ueber Zonengrenzen hinweg nicht - dort stehen die Stuetzmauern.
+ */
+export const TERRAIN_ZONES = [
+  {
+    id: 'garten', label: 'Garten Kellenberger',
+    polygon: [[-20.90, -6.60], [3.00, -6.60], [3.00, 5.95], [-20.90, 5.95]],
+    fallback: -0.05,
+  },
+  {
+    id: 'zufahrt', label: 'Feuerwehrzufahrt / Schotterwiese West',
+    polygon: [[-26.00, -9.00], [-20.90, -9.00], [-20.90, 6.50], [-26.00, 6.50]],
+    fallback: -1.20,
+  },
+  {
+    id: 'zollet', label: 'Nachbargarten Zollet',
+    polygon: [[-24.00, -14.50], [3.00, -14.50], [3.00, -6.60], [-24.00, -6.60]],
+    fallback: -1.70,
+  },
+  {
+    id: 'sued', label: 'Nachbargrundstück Süd',
+    polygon: [[-22.00, 5.95], [6.00, 5.95], [6.00, 12.00], [-22.00, 12.00]],
+    fallback: -0.20,
+  },
+  {
+    id: 'ost', label: 'Wiese Ost',
+    polygon: [[3.00, -6.60], [9.00, -6.60], [9.00, 5.95], [3.00, 5.95]],
+    fallback: 0.55,
+  },
+];
+
+/**
+ * Zusaetzliche Hoehenpunkte, die im Plan nicht als Kote stehen, fuer ein
+ * plausibles Gelaende aber noetig sind (Auslauf gegen die Grundstuecksraender).
+ */
+export const EXTRA_SPOTS = [
+  { x: -24.5, z: -8.0, y: -2.60, zone: 'zufahrt' },
+  { x: -24.5, z: 0.0, y: -1.60, zone: 'zufahrt' },
+  { x: -24.5, z: 5.0, y: -0.60, zone: 'zufahrt' },
+  { x: -22.6, z: 5.5, y: -0.30, zone: 'zufahrt' },
+  { x: -20.0, z: -12.5, y: -1.75, zone: 'zollet' },
+  { x: -8.0, z: -12.5, y: -1.70, zone: 'zollet' },
+  { x: 2.0, z: -11.5, y: -1.65, zone: 'zollet' },
+  { x: -18.0, z: 9.0, y: -0.40, zone: 'sued' },
+  { x: -6.0, z: 9.0, y: 0.10, zone: 'sued' },
+  { x: 4.0, z: 9.0, y: 0.60, zone: 'sued' },
+  { x: 7.5, z: -5.0, y: 0.10, zone: 'ost' },
+  { x: 7.5, z: 0.0, y: 0.45, zone: 'ost' },
+  { x: 7.5, z: 5.0, y: 0.80, zone: 'ost' },
+];
+
+/** Startposition und Blickrichtung beim Betreten der Szene. yaw = Grad ab Nord. */
+export const START_VIEWS = [
+  { id: 'sitzplatz', label: 'Hauptsitzplatz', x: -18.6, z: -2.6, yaw: 135, note: 'Travertinplatten 80x80x3 cm, Blick über den Sitzplatz gegen den Rasen' },
+  { id: 'gedeckt', label: 'Gedeckter Sitzplatz', x: -11.0, z: -1.2, yaw: 215, note: 'Keramikplatten unter dem Obergeschoss, hinter der Lamellenwand' },
+  { id: 'rasen', label: 'Rasen Süd', x: -13.0, z: 2.8, yaw: 75, note: 'Blick der Südfassade entlang zum Spielbereich' },
+  { id: 'grill', label: 'Flammengrill', x: -7.8, z: 2.6, yaw: 110, note: 'Dekorkiesfeld mit Flammengrill und Holzscheiterwand' },
+  { id: 'spielplatz', label: 'Spielbereich', x: -3.4, z: 1.4, yaw: 150, note: 'Spielsand, Spielhaus und Apfelbaum' },
+  { id: 'eingang', label: 'Hauseingang', x: 1.3, z: -1.8, yaw: 250, note: 'Keramikplatten beim Fixpunkt 0.00' },
+];
+
+/** Standort fuer den Sonnenstand: Abtwil SG. */
+export const SITE_LOCATION = {
+  name: 'Egglihaldenstrasse 9a, 9030 Abtwil SG',
+  lat: 47.4206,
+  lon: 9.2903,
+  /** Peilung der Site-X-Achse gegenueber Nord, in Grad. */
+  northBearingOfSiteX: 61.1615,
+  groundMasl: 651.17,
+};
diff --git a/tools/build-site.mjs b/tools/build-site.mjs
new file mode 100644
index 0000000..6b5d8a3
--- /dev/null
+++ b/tools/build-site.mjs
@@ -0,0 +1,351 @@
+/**
+ * Baut aus der Planextraktion (tools/out/plan-raw.json) und den handgepflegten
+ * Ergaenzungen (tools/authoring.mjs) das Szenenmodell public/data/site.json.
+ *
+ * Aufruf:  node tools/build-site.mjs
+ */
+import fs from 'node:fs';
+import path from 'node:path';
+import { fileURLToPath } from 'node:url';
+import {
+  SURFACE_BY_COLOR, PLANT_BY_COLOR, TREES, WALLS, PROPS, STELEN,
+  BUILDING, NEIGHBOUR_BUILDINGS, TERRAIN_ZONES, EXTRA_SPOTS, EXTRA_SURFACES,
+  START_VIEWS, SITE_LOCATION,
+} from './authoring.mjs';
+
+const __dirname = path.dirname(fileURLToPath(import.meta.url));
+const ROOT = path.resolve(__dirname, '..');
+const raw = JSON.parse(fs.readFileSync(path.join(__dirname, 'out', 'plan-raw.json'), 'utf8'));
+
+/** Rasterweite des Hoehenmodells in Metern. */
+const CELL = 0.25;
+const GRID = { x0: -26, z0: -14.5, x1: 9, z1: 12 };
+
+const round = (v, n = 3) => +v.toFixed(n);
+
+// ---------------------------------------------------------------------------
+// Geometrie-Helfer
+// ---------------------------------------------------------------------------
+
+function pointInPolygon(x, z, poly) {
+  let inside = false;
+  for (let i = 0, j = poly.length - 1; i < poly.length; j = i++) {
+    const [xi, zi] = poly[i], [xj, zj] = poly[j];
+    if ((zi > z) !== (zj > z) && x < ((xj - xi) * (z - zi)) / (zj - zi) + xi) inside = !inside;
+  }
+  return inside;
+}
+
+function polygonArea(poly) {
+  let a = 0;
+  for (let i = 0; i < poly.length; i++) {
+    const [x0, z0] = poly[i], [x1, z1] = poly[(i + 1) % poly.length];
+    a += x0 * z1 - x1 * z0;
+  }
+  return a / 2;
+}
+
+function centroid(poly) {
+  let x = 0, z = 0;
+  for (const p of poly) { x += p[0]; z += p[1]; }
+  return [x / poly.length, z / poly.length];
+}
+
+/** Ebene y = a*x + b*z + c durch Punkte, kleinste Quadrate. Null bei Entartung. */
+function fitPlane(points) {
+  if (points.length < 3) return null;
+  let sxx = 0, sxz = 0, szz = 0, sx = 0, sz = 0, n = points.length;
+  let sxy = 0, szy = 0, sy = 0;
+  for (const p of points) {
+    sxx += p.x * p.x; sxz += p.x * p.z; szz += p.z * p.z;
+    sx += p.x; sz += p.z;
+    sxy += p.x * p.y; szy += p.z * p.y; sy += p.y;
+  }
+  const m = [[sxx, sxz, sx], [sxz, szz, sz], [sx, sz, n]];
+  const v = [sxy, szy, sy];
+  const det =
+    m[0][0] * (m[1][1] * m[2][2] - m[1][2] * m[2][1]) -
+    m[0][1] * (m[1][0] * m[2][2] - m[1][2] * m[2][0]) +
+    m[0][2] * (m[1][0] * m[2][1] - m[1][1] * m[2][0]);
+  if (Math.abs(det) < 1e-9) return null;
+  const solve = (col) => {
+    const mm = m.map((r) => r.slice());
+    for (let i = 0; i < 3; i++) mm[i][col] = v[i];
+    return (
+      mm[0][0] * (mm[1][1] * mm[2][2] - mm[1][2] * mm[2][1]) -
+      mm[0][1] * (mm[1][0] * mm[2][2] - mm[1][2] * mm[2][0]) +
+      mm[0][2] * (mm[1][0] * mm[2][1] - mm[1][1] * mm[2][0])
+    ) / det;
+  };
+  return { a: solve(0), b: solve(1), c: solve(2) };
+}
+
+// ---------------------------------------------------------------------------
+// 1. Belagsflaechen
+// ---------------------------------------------------------------------------
+
+/** Bauteile, die als Mauer modelliert werden - nicht als begehbare Flaeche. */
+const NOT_A_SURFACE = new Set(['travertinmauer', 'winkelelement', 'spielhaus', 'gartenhaus', 'roboter', 'ligusterhecke']);
+
+const surfaces = [];
+for (const s of raw.shapes) {
+  if (s.op !== 'f' || s.circle) continue;
+  const type = SURFACE_BY_COLOR[s.hex];
+  if (!type) continue;
+  if (s.area < 0.35) continue;
+  if (NOT_A_SURFACE.has(type)) continue;
+  const poly = polygonArea(s.pts) < 0 ? [...s.pts].reverse() : s.pts;
+  surfaces.push({ type, area: round(s.area, 2), polygon: poly.map((p) => [round(p[0]), round(p[1])]) });
+}
+for (const s of EXTRA_SURFACES) {
+  const poly = polygonArea(s.polygon) < 0 ? [...s.polygon].reverse() : s.polygon;
+  surfaces.push({ type: s.type, area: round(Math.abs(polygonArea(s.polygon)), 2), polygon: poly, note: s.note });
+}
+surfaces.sort((a, b) => b.area - a.area);
+
+// ---------------------------------------------------------------------------
+// 2. Hecken und Pflanzen aus den Plankreisen
+// ---------------------------------------------------------------------------
+
+const treeAt = (x, z, tol = 0.6) => TREES.find((t) => Math.hypot(t.x - x, t.z - z) < tol);
+
+const plants = [];
+for (const s of raw.shapes) {
+  if (s.op !== 'f' || !s.circle) continue;
+  const type = PLANT_BY_COLOR[s.hex];
+  if (!type) continue;
+  const { cx, cz, r } = s.circle;
+  if (r < 0.06) continue;                 // Lampensymbole und Punktraster
+  if (treeAt(cx, cz)) continue;           // Solitaere kommen aus dem Authoring
+  plants.push({ type, x: round(cx), z: round(cz), r: round(r, 2) });
+}
+// Der Ligusterhecken-Streifen ist im Plan eine Flaeche, keine Kreise.
+for (const s of raw.shapes) {
+  if (s.op === 'f' && s.hex === '#73e900' && s.area > 1) {
+    plants.push({ type: 'hecke', kind: 'liguster', height: 1.7, width: 0.75, polygon: s.pts.map((p) => [round(p[0]), round(p[1])]) });
+  }
+}
+
+const trees = TREES.map((t) => ({ ...t, x: round(t.x), z: round(t.z) }));
+
+// ---------------------------------------------------------------------------
+// 3. Leuchten
+// ---------------------------------------------------------------------------
+
+const lamps = [];
+const addLamp = (x, z, kind) => {
+  if (lamps.some((l) => Math.hypot(l.x - x, l.z - z) < 0.35)) return;
+  lamps.push({ x: round(x), z: round(z), kind });
+};
+for (const s of raw.shapes) {
+  if (s.op !== 'f') continue;
+  const [cx, cz] = centroid(s.pts);
+  // Rote Quadrate = Wand-/Pollerleuchten an Grenze und Mauern
+  if (s.hex === '#ff0000' && s.area > 0.02 && s.area < 0.08) addLamp(cx, cz, 'poller');
+  // Kleine gelbe Marker im Kreissymbol = Bodenstrahler
+  else if (s.hex === '#ffff00' && s.area < 0.05) addLamp(cx, cz, 'boden');
+}
+
+// ---------------------------------------------------------------------------
+// 4. Hoehenmodell
+// ---------------------------------------------------------------------------
+
+const zoneOf = (x, z) => {
+  for (const zone of TERRAIN_ZONES) if (pointInPolygon(x, z, zone.polygon)) return zone.id;
+  return null;
+};
+
+const spots = [
+  ...raw.spots.map((s) => ({ x: s.x, z: s.z, y: s.y, zone: zoneOf(s.x, s.z) })),
+  ...EXTRA_SPOTS,
+];
+// Die Kote 1.47 gehoert zum Spielhauspodest, nicht zum Gelaende.
+const terrainSpots = spots.filter((s) => s.zone && s.y < 1.2);
+
+/** Flaechen, die als Ebene ausgebildet sind - dort wird das Raster begradigt. */
+const FLAT_TYPES = new Set(['travertin80', 'travertin4060', 'travertinstell', 'keramik', 'verbundstein', 'tegula', 'spielsand']);
+const flatSurfaces = [];
+for (const s of surfaces) {
+  if (!FLAT_TYPES.has(s.type) || s.area < 1.0) continue;
+  const inside = terrainSpots.filter((sp) => pointInPolygon(sp.x, sp.z, s.polygon));
+  if (!inside.length) continue;
+  let plane = inside.length >= 3 ? fitPlane(inside) : null;
+  // Fast kollineare Koten liefern wilde Ebenen. Nur uebernehmen, wenn das
+  // Gefaelle plausibel ist (< 10 %) und alle Koten getroffen werden.
+  if (plane) {
+    const slope = Math.hypot(plane.a, plane.b);
+    const maxDev = Math.max(...inside.map((p) => Math.abs(plane.a * p.x + plane.b * p.z + plane.c - p.y)));
+    if (slope > 0.10 || maxDev > 0.06) plane = null;
+  }
+  const ys = inside.map((p) => p.y);
+  const mean = ys.reduce((a, b) => a + b, 0) / ys.length;
+  flatSurfaces.push({
+    polygon: s.polygon, plane, mean, type: s.type,
+    min: Math.min(...ys) - 0.15, max: Math.max(...ys) + 0.15,
+  });
+}
+
+const nx = Math.round((GRID.x1 - GRID.x0) / CELL) + 1;
+const nz = Math.round((GRID.z1 - GRID.z0) / CELL) + 1;
+const height = new Float32Array(nx * nz);
+
+/**
+ * Inverse Distanzwichtung innerhalb einer Zone. Der weiche Kern (1/(d^2+c))
+ * vermeidet Spitzen um die einzelnen Koten - ein 1/d^3-Kern erzeugt Beulen,
+ * die spaeter durch die Belagsflaechen durchstossen.
+ */
+function interpolate(x, z, zoneId) {
+  const pool = terrainSpots.filter((s) => s.zone === zoneId);
+  if (!pool.length) return TERRAIN_ZONES.find((t) => t.id === zoneId)?.fallback ?? 0;
+  let num = 0, den = 0;
+  for (const s of pool) {
+    const d2 = (s.x - x) ** 2 + (s.z - z) ** 2;
+    const w = 1 / (d2 * d2 + 0.35);
+    num += w * s.y; den += w;
+  }
+  return num / den;
+}
+
+for (let j = 0; j < nz; j++) {
+  const z = GRID.z0 + j * CELL;
+  for (let i = 0; i < nx; i++) {
+    const x = GRID.x0 + i * CELL;
+    const zone = zoneOf(x, z);
+    let y;
+    if (!zone) {
+      // Ausserhalb aller Zonen: naechstgelegene Zone weiterziehen
+      let best = null, bd = Infinity;
+      for (const t of TERRAIN_ZONES) {
+        const [cx, cz] = centroid(t.polygon);
+        const d = Math.hypot(cx - x, cz - z);
+        if (d < bd) { bd = d; best = t; }
+      }
+      y = best.fallback;
+    } else {
+      y = interpolate(x, z, zone);
+      for (const f of flatSurfaces) {
+        if (!pointInPolygon(x, z, f.polygon)) continue;
+        y = f.plane ? f.plane.a * x + f.plane.b * z + f.plane.c : f.mean;
+        y = Math.max(f.min, Math.min(f.max, y));
+        break;
+      }
+    }
+    height[j * nx + i] = y;
+  }
+}
+
+// Zwei Glaettungsrunden, damit weder die Kanten der Ebenen schneiden noch
+// einzelne Koten als Beulen stehenbleiben.
+let smoothed = Float32Array.from(height);
+for (let pass = 0; pass < 2; pass++) {
+  const src = smoothed;
+  const dst = Float32Array.from(src);
+  for (let j = 1; j < nz - 1; j++) {
+    for (let i = 1; i < nx - 1; i++) {
+      const k = j * nx + i;
+      dst[k] = (src[k] * 4 + src[k - 1] + src[k + 1] + src[k - nx] + src[k + nx]) / 8;
+    }
+  }
+  smoothed = dst;
+}
+
+// ---------------------------------------------------------------------------
+// 5. Mauern: fehlende Hoehen aus dem Gelaende ergaenzen
+// ---------------------------------------------------------------------------
+
+function sampleHeight(x, z) {
+  const fi = (x - GRID.x0) / CELL, fj = (z - GRID.z0) / CELL;
+  const i = Math.max(0, Math.min(nx - 2, Math.floor(fi)));
+  const j = Math.max(0, Math.min(nz - 2, Math.floor(fj)));
+  const tx = Math.max(0, Math.min(1, fi - i)), tz = Math.max(0, Math.min(1, fj - j));
+  const h = (a, b) => smoothed[b * nx + a];
+  return (
+    h(i, j) * (1 - tx) * (1 - tz) + h(i + 1, j) * tx * (1 - tz) +
+    h(i, j + 1) * (1 - tx) * tz + h(i + 1, j + 1) * tx * tz
+  );
+}
+
+/** Punkt und Normale auf einem Polyzug bei relativer Bogenlaenge t. */
+function alongPath(path, t) {
+  const segs = path.slice(1).map((p, i) => ({
+    a: path[i], b: p, len: Math.hypot(p[0] - path[i][0], p[1] - path[i][1]),
+  }));
+  const total = segs.reduce((s, g) => s + g.len, 0);
+  let want = t * total;
+  for (const s of segs) {
+    if (want <= s.len || s === segs[segs.length - 1]) {
+      const u = s.len > 0 ? Math.min(1, want / s.len) : 0;
+      const dx = (s.b[0] - s.a[0]) / (s.len || 1);
+      const dz = (s.b[1] - s.a[1]) / (s.len || 1);
+      return { x: s.a[0] + (s.b[0] - s.a[0]) * u, z: s.a[1] + (s.b[1] - s.a[1]) * u, nx: -dz, nz: dx };
+    }
+    want -= s.len;
+  }
+  return { x: path[0][0], z: path[0][1], nx: 0, nz: 1 };
+}
+
+const walls = WALLS.map((w) => {
+  const out = { ...w };
+  if (w.retains) {
+    // Stuetzelement: Krone folgt der hoeheren Seite, Fuss der tieferen.
+    // Ein Meter beidseits reicht, um die beiden Gelaendeniveaus abzugreifen.
+    const n = 24;
+    const crest = [], foot = [];
+    for (let i = 0; i <= n; i++) {
+      const { x, z, nx, nz } = alongPath(w.path, i / n);
+      const hA = sampleHeight(x + nx * 1.0, z + nz * 1.0);
+      const hB = sampleHeight(x - nx * 1.0, z - nz * 1.0);
+      crest.push(round(Math.max(hA, hB) + 0.06, 3));
+      foot.push(round(Math.min(hA, hB) - 0.25, 3));
+    }
+    out.crestProfile = crest;
+    out.footProfile = foot;
+  }
+  return out;
+});
+
+// ---------------------------------------------------------------------------
+// 6. Ausgabe
+// ---------------------------------------------------------------------------
+
+const site = {
+  meta: {
+    ...raw.meta,
+    generated: new Date().toISOString().slice(0, 10),
+    location: SITE_LOCATION,
+    plan: 'Gartenplan 1, Garten Design AG, 14.08.2026, Massstab 1:100',
+    architecture: 'Haus 9a, EHLE Architekten AG, Projektplaene 27.04.2021',
+  },
+  terrain: {
+    grid: { x0: GRID.x0, z0: GRID.z0, cell: CELL, nx, nz },
+    heights: Array.from(smoothed, (v) => round(v, 3)),
+    zones: TERRAIN_ZONES.map((z) => ({ id: z.id, label: z.label, polygon: z.polygon })),
+    spots: terrainSpots.map((s) => ({ x: round(s.x), z: round(s.z), y: s.y, zone: s.zone })),
+  },
+  surfaces,
+  plants,
+  trees,
+  lamps,
+  walls,
+  props: PROPS,
+  stelen: STELEN,
+  building: BUILDING,
+  neighbourBuildings: NEIGHBOUR_BUILDINGS,
+  startViews: START_VIEWS,
+};
+
+fs.mkdirSync(path.join(ROOT, 'public', 'data'), { recursive: true });
+const file = path.join(ROOT, 'public', 'data', 'site.json');
+fs.writeFileSync(file, JSON.stringify(site));
+
+const byType = {};
+for (const s of surfaces) byType[s.type] = (byType[s.type] ?? 0) + s.area;
+console.log(`site.json  ${(fs.statSync(file).size / 1024).toFixed(0)} kB`);
+console.log(`Belagsflaechen ${surfaces.length}:`);
+for (const [t, a] of Object.entries(byType).sort((x, y) => y[1] - x[1])) {
+  console.log('  ' + t.padEnd(16) + a.toFixed(1).padStart(7) + ' m2');
+}
+console.log(`Pflanzen ${plants.length}, Baeume ${trees.length}, Leuchten ${lamps.length}, Mauern ${walls.length}, Objekte ${PROPS.length}, Stelen ${STELEN.length}`);
+console.log(`Hoehenraster ${nx} x ${nz} (${CELL} m), Koten ${terrainSpots.length}`);
+const hs = Array.from(smoothed);
+console.log(`Hoehen ${Math.min(...hs).toFixed(2)} .. ${Math.max(...hs).toFixed(2)} m  (absolut ${(651.17 + Math.min(...hs)).toFixed(2)} .. ${(651.17 + Math.max(...hs)).toFixed(2)} m ue. M.)`);
diff --git a/tools/debug-svg.mjs b/tools/debug-svg.mjs
new file mode 100644
index 0000000..13681f0
--- /dev/null
+++ b/tools/debug-svg.mjs
@@ -0,0 +1,59 @@
+/**
+ * Zeichnet die extrahierte Geometrie als SVG-Draufsicht - Kontrolle, ob die
+ * Transformation aus dem PDF stimmt.
+ *
+ * Aufruf:  node tools/debug-svg.mjs [nur-farbe-hex]
+ */
+import fs from 'node:fs';
+import path from 'node:path';
+import { fileURLToPath } from 'node:url';
+
+const __dirname = path.dirname(fileURLToPath(import.meta.url));
+const OUT = path.join(__dirname, 'out');
+const data = JSON.parse(fs.readFileSync(path.join(OUT, 'plan-raw.json'), 'utf8'));
+const only = process.argv[2]?.toLowerCase();
+
+const PAD = 1.5;
+const PXM = 34; // Pixel pro Meter
+let x0 = Infinity, z0 = Infinity, x1 = -Infinity, z1 = -Infinity;
+for (const s of data.shapes) for (const [x, z] of s.pts) {
+  x0 = Math.min(x0, x); x1 = Math.max(x1, x); z0 = Math.min(z0, z); z1 = Math.max(z1, z);
+}
+x0 -= PAD; z0 -= PAD; x1 += PAD; z1 += PAD;
+const W = Math.round((x1 - x0) * PXM), H = Math.round((z1 - z0) * PXM);
+const X = (x) => ((x - x0) * PXM).toFixed(1);
+const Z = (z) => ((z - z0) * PXM).toFixed(1);
+
+const out = [];
+out.push(`<svg xmlns="http://www.w3.org/2000/svg" width="${W}" height="${H}" viewBox="0 0 ${W} ${H}">`);
+out.push(`<rect width="${W}" height="${H}" fill="#ffffff"/>`);
+
+const fills = data.shapes.filter((s) => s.op === 'f' && s.area > 0.05);
+fills.sort((a, b) => b.area - a.area);
+for (const s of fills) {
+  if (only && s.hex.toLowerCase() !== only) continue;
+  const d = s.pts.map((p, i) => `${i ? 'L' : 'M'}${X(p[0])},${Z(p[1])}`).join('') + 'Z';
+  out.push(`<path d="${d}" fill="${s.hex}" fill-opacity="0.85" stroke="#0006" stroke-width="0.4"/>`);
+}
+if (!only) {
+  for (const s of data.shapes) {
+    if (s.op !== 's' || s.pts.length < 2) continue;
+    const d = s.pts.map((p, i) => `${i ? 'L' : 'M'}${X(p[0])},${Z(p[1])}`).join('');
+    out.push(`<path d="${d}" fill="none" stroke="#333" stroke-width="0.35" stroke-opacity="0.55"/>`);
+  }
+  for (const sp of data.spots) {
+    out.push(`<circle cx="${X(sp.x)}" cy="${Z(sp.z)}" r="2.4" fill="#d00"/>`);
+    out.push(`<text x="${X(sp.x) - 0}" y="${+Z(sp.z) - 4}" font-size="9" fill="#a00" text-anchor="middle">${sp.y.toFixed(2)}</text>`);
+  }
+}
+// Massstab und Achsen
+out.push(`<g stroke="#06c" stroke-width="2" fill="none">
+  <path d="M${X(0)},${Z(0)} L${X(5)},${Z(0)}"/><path d="M${X(0)},${Z(0)} L${X(0)},${Z(5)}"/></g>`);
+out.push(`<text x="${X(5.2)}" y="${Z(0)}" font-size="13" fill="#06c">+X (ENE)</text>`);
+out.push(`<text x="${X(0.2)}" y="${Z(5.4)}" font-size="13" fill="#06c">+Z (SSE)</text>`);
+out.push(`<text x="12" y="20" font-size="14" fill="#333">Gartenplan &#8594; Site-Frame &#183; ${(x1 - x0).toFixed(1)} &#215; ${(z1 - z0).toFixed(1)} m &#183; 1 Raster = 1 m</text>`);
+out.push('</svg>');
+
+const file = path.join(OUT, only ? `debug-${only.replace('#', '')}.svg` : 'debug-plan.svg');
+fs.writeFileSync(file, out.join('\n'));
+console.log('geschrieben:', file, `${W}x${H}px`);
diff --git a/tools/extract-plan.mjs b/tools/extract-plan.mjs
new file mode 100644
index 0000000..18a1d93
--- /dev/null
+++ b/tools/extract-plan.mjs
@@ -0,0 +1,264 @@
+/**
+ * Extrahiert die Vektorgeometrie aus dem Gartenplan-PDF (Garten Design AG, 1:100)
+ * und transformiert sie in ein georeferenziertes, hausachsen-paralleles
+ * Koordinatensystem in Metern.
+ *
+ * Ausgabe: tools/out/plan-raw.json
+ *
+ * Koordinatensystem (Site-Frame, entspricht three.js X/Z):
+ *   X  = Hausachse ENE, Peilung  61.16 deg
+ *   Z  = senkrecht dazu SSE, Peilung 151.16 deg
+ *   Y  = Hoehe (hier nicht enthalten, kommt aus den Hoehenkoten)
+ *   Ursprung = Fixpunkt "0.00" beim Hauseingang, absolut 651.17 m ue. M.
+ *
+ * Aufruf:  node tools/extract-plan.mjs
+ */
+import * as mupdf from 'mupdf';
+import fs from 'node:fs';
+import path from 'node:path';
+import { fileURLToPath } from 'node:url';
+
+const __dirname = path.dirname(fileURLToPath(import.meta.url));
+const ROOT = path.resolve(__dirname, '..');
+const PDF = path.join(ROOT, 'Info Dateien', 'Gartenplan 1 Jasmin und Damian Kellenberger.pdf');
+const OUT_DIR = path.join(__dirname, 'out');
+
+/** Massstab 1:100 -> 1 PDF-Punkt entspricht 0.0352778 m in der Realitaet. */
+const PT_TO_M = (25.4 / 72 / 1000) * 100;
+
+/** Zeichnungsraster gegenueber Blattkante, aus der Winkelanalyse der Linien. */
+const GRID_ANGLE_DEG = -28.8385;
+
+/** Nur dieser Blattausschnitt enthaelt den Situationsplan (PDF-Punkte). */
+const PLAN_CLIP = { x0: 600, y0: 150, x1: 1800, y1: 1060 };
+
+const cos = Math.cos((GRID_ANGLE_DEG * Math.PI) / 180);
+const sin = Math.sin((GRID_ANGLE_DEG * Math.PI) / 180);
+
+/**
+ * PDF-Punkt -> Site-Meter, noch ohne Ursprungsversatz.
+ * Auf dem Blatt ist Norden oben, also entspricht (x, y) direkt (Ost, Sued).
+ * Projektion auf die beiden Rasterachsen des Plans:
+ *   d1 = (cos, sin) bei GRID_ANGLE_DEG  -> Site-X (Hausachse ENE)
+ *   d2 = (-sin, cos)                    -> Site-Z (SSE)
+ */
+function toSite(x, y) {
+  return [(x * cos + y * sin) * PT_TO_M, (-x * sin + y * cos) * PT_TO_M];
+}
+
+function bboxOf(segs) {
+  let x0 = Infinity, y0 = Infinity, x1 = -Infinity, y1 = -Infinity;
+  for (const s of segs) {
+    for (let i = 1; i + 1 < s.length; i += 2) {
+      x0 = Math.min(x0, s[i]); x1 = Math.max(x1, s[i]);
+      y0 = Math.min(y0, s[i + 1]); y1 = Math.max(y1, s[i + 1]);
+    }
+  }
+  return [x0, y0, x1, y1];
+}
+
+/** Flaeche eines geschlossenen Polygonzugs (Shoelace), in m^2. */
+function areaOf(points) {
+  let a = 0;
+  for (let i = 0; i < points.length; i++) {
+    const [x0, z0] = points[i];
+    const [x1, z1] = points[(i + 1) % points.length];
+    a += x0 * z1 - x1 * z0;
+  }
+  return Math.abs(a) / 2;
+}
+
+/**
+ * Erkennt, ob ein Pfad ein Kreis ist (Pflanzensymbole sind Bezier-Kreise).
+ * Liefert {cx, cz, r} oder null.
+ */
+function asCircle(points) {
+  if (points.length < 8) return null;
+  let cx = 0, cz = 0;
+  for (const [x, z] of points) { cx += x; cz += z; }
+  cx /= points.length; cz /= points.length;
+  let rMin = Infinity, rMax = 0, rSum = 0;
+  for (const [x, z] of points) {
+    const r = Math.hypot(x - cx, z - cz);
+    rMin = Math.min(rMin, r); rMax = Math.max(rMax, r); rSum += r;
+  }
+  const r = rSum / points.length;
+  if (r < 0.05) return null;
+  // Toleranz: echte Kreise streuen unter 12 % um den Mittelwert.
+  if ((rMax - rMin) / r > 0.12) return null;
+  return { cx, cz, r };
+}
+
+function flattenSegments(segs) {
+  // Beziers werden linear unterteilt; 8 Stuetzstellen reichen bei Plangroessen.
+  const rings = [];
+  let cur = null, sx = 0, sy = 0, px = 0, py = 0;
+  const push = (x, y) => { cur.push([x, y]); px = x; py = y; };
+  for (const s of segs) {
+    switch (s[0]) {
+      case 'M':
+        if (cur && cur.length > 1) rings.push(cur);
+        cur = []; sx = s[1]; sy = s[2]; push(s[1], s[2]);
+        break;
+      case 'L':
+        if (!cur) { cur = []; sx = s[1]; sy = s[2]; }
+        push(s[1], s[2]);
+        break;
+      case 'C': {
+        if (!cur) { cur = []; sx = px; sy = py; cur.push([px, py]); }
+        const [x0, y0] = [px, py];
+        for (let i = 1; i <= 8; i++) {
+          const t = i / 8, u = 1 - t;
+          const x = u * u * u * x0 + 3 * u * u * t * s[1] + 3 * u * t * t * s[3] + t * t * t * s[5];
+          const y = u * u * u * y0 + 3 * u * u * t * s[2] + 3 * u * t * t * s[4] + t * t * t * s[6];
+          cur.push([x, y]);
+        }
+        px = s[5]; py = s[6];
+        break;
+      }
+      case 'Z':
+        if (cur && cur.length > 1) { rings.push(cur); }
+        cur = [[sx, sy]]; px = sx; py = sy;
+        break;
+    }
+  }
+  if (cur && cur.length > 1) rings.push(cur);
+  return rings;
+}
+
+/** Entfernt doppelte und kollineare Stuetzpunkte. */
+function simplify(points, eps = 0.004) {
+  const out = [];
+  for (const p of points) {
+    const last = out[out.length - 1];
+    if (last && Math.hypot(p[0] - last[0], p[1] - last[1]) < eps) continue;
+    out.push(p);
+  }
+  while (out.length > 1 && Math.hypot(out[0][0] - out[out.length - 1][0], out[0][1] - out[out.length - 1][1]) < eps) {
+    out.pop();
+  }
+  const res = [];
+  for (let i = 0; i < out.length; i++) {
+    const a = out[(i - 1 + out.length) % out.length], b = out[i], c = out[(i + 1) % out.length];
+    const cross = (b[0] - a[0]) * (c[1] - a[1]) - (b[1] - a[1]) * (c[0] - a[0]);
+    if (Math.abs(cross) < 1e-5 && out.length > 3) continue;
+    res.push(b);
+  }
+  return res.length >= 3 ? res : out;
+}
+
+function main() {
+  const doc = mupdf.Document.openDocument(fs.readFileSync(PDF), 'application/pdf');
+  const page = doc.loadPage(0);
+
+  // --- 1. Vektor-Operationen mitschneiden -------------------------------
+  const raw = [];
+  const apply = (m, x, y) => [m[0] * x + m[2] * y + m[4], m[1] * x + m[3] * y + m[5]];
+  const walk = (p, m) => {
+    const segs = [];
+    p.walk({
+      moveTo: (x, y) => segs.push(['M', ...apply(m, x, y)]),
+      lineTo: (x, y) => segs.push(['L', ...apply(m, x, y)]),
+      curveTo: (a, b, c, d, e, f) => segs.push(['C', ...apply(m, a, b), ...apply(m, c, d), ...apply(m, e, f)]),
+      closePath: () => segs.push(['Z']),
+    });
+    return segs;
+  };
+  const noop = () => {};
+  const device = new mupdf.Device({
+    fillPath: (p, eo, m, cs, color) => raw.push({ op: 'f', segs: walk(p, m), c: Array.from(color || []) }),
+    strokePath: (p, st, m, cs, color) => raw.push({ op: 's', segs: walk(p, m), c: Array.from(color || []), lw: st?.lineWidth ?? 0 }),
+    fillShade: noop, fillImage: noop, fillImageMask: noop,
+    clipPath: noop, clipStrokePath: noop, clipImageMask: noop, popClip: noop,
+    fillText: noop, strokeText: noop, clipText: noop, clipStrokeText: noop, ignoreText: noop,
+    beginMask: noop, endMask: noop, beginGroup: noop, endGroup: noop,
+    beginTile: () => 0, endTile: noop, beginLayer: noop, endLayer: noop, close: noop,
+  });
+  page.run(device, mupdf.Matrix.identity);
+  device.close();
+
+  // --- 2. Auf den Planausschnitt beschraenken und transformieren --------
+  const shapes = [];
+  for (const it of raw) {
+    if (!it.segs.length) continue;
+    const b = bboxOf(it.segs);
+    if (!(b[0] >= PLAN_CLIP.x0 && b[2] <= PLAN_CLIP.x1 && b[1] >= PLAN_CLIP.y0 && b[3] <= PLAN_CLIP.y1)) continue;
+    for (const ring of flattenSegments(it.segs)) {
+      const pts = simplify(ring.map(([x, y]) => toSite(x, y)));
+      if (pts.length < 2) continue;
+      const rgb = it.c.length >= 3 ? it.c.slice(0, 3).map((v) => Math.round(v * 255)) : [0, 0, 0];
+      shapes.push({
+        op: it.op,
+        color: rgb,
+        hex: '#' + rgb.map((v) => v.toString(16).padStart(2, '0')).join(''),
+        pts,
+        area: it.op === 'f' ? +areaOf(pts).toFixed(4) : 0,
+        circle: asCircle(pts),
+        lw: it.lw ? +(it.lw * PT_TO_M).toFixed(3) : 0,
+      });
+    }
+  }
+
+  // --- 3. Beschriftungen mit Position -----------------------------------
+  const st = JSON.parse(page.toStructuredText('preserve-whitespace').asJSON());
+  const labels = [];
+  for (const block of st.blocks ?? []) {
+    if (block.type !== 'text') continue;
+    for (const line of block.lines ?? []) {
+      const t = (line.text ?? '').trim();
+      if (!t) continue;
+      const { x, y, w, h } = line.bbox;
+      if (x < PLAN_CLIP.x0 || x > PLAN_CLIP.x1 || y < PLAN_CLIP.y0 || y > PLAN_CLIP.y1) continue;
+      const [sx, sz] = toSite(x + w / 2, y + h / 2);
+      labels.push({ text: t, x: +sx.toFixed(3), z: +sz.toFixed(3) });
+    }
+  }
+
+  // --- 4. Ursprung auf den Fixpunkt legen -------------------------------
+  const fix = labels.find((l) => l.text.includes('0.00 Fixpunkt')) ?? labels.find((l) => l.text === 'Eingang');
+  const ox = fix ? fix.x : 0;
+  const oz = fix ? fix.z : 0;
+  const shift = (p) => [+(p[0] - ox).toFixed(4), +(p[1] - oz).toFixed(4)];
+  for (const s of shapes) {
+    s.pts = s.pts.map(shift);
+    if (s.circle) {
+      s.circle.cx = +(s.circle.cx - ox).toFixed(4);
+      s.circle.cz = +(s.circle.cz - oz).toFixed(4);
+      s.circle.r = +s.circle.r.toFixed(4);
+    }
+  }
+  for (const l of labels) { l.x = +(l.x - ox).toFixed(3); l.z = +(l.z - oz).toFixed(3); }
+
+  // --- 5. Hoehenkoten aus den Beschriftungen --------------------------
+  const spots = labels
+    .filter((l) => /^-?\d\.\d{2}$/.test(l.text))
+    .map((l) => ({ x: l.x, z: l.z, y: parseFloat(l.text) }));
+
+  fs.mkdirSync(OUT_DIR, { recursive: true });
+  const out = {
+    meta: {
+      source: path.basename(PDF),
+      scale: '1:100',
+      ptToM: PT_TO_M,
+      gridAngleDeg: GRID_ANGLE_DEG,
+      northBearingOfSiteX: 61.1615,
+      originLabel: fix?.text ?? null,
+      originAbsoluteMasl: 651.17,
+      note: 'X = Hausachse ENE, Z = SSE, Ursprung = Fixpunkt 0.00 beim Eingang',
+    },
+    shapes,
+    labels,
+    spots,
+  };
+  fs.writeFileSync(path.join(OUT_DIR, 'plan-raw.json'), JSON.stringify(out));
+
+  const fills = shapes.filter((s) => s.op === 'f');
+  console.log(`Formen:  ${shapes.length}  (Fuellungen ${fills.length}, Linien ${shapes.length - fills.length})`);
+  console.log(`Kreise:  ${shapes.filter((s) => s.circle).length}`);
+  console.log(`Labels:  ${labels.length}   Hoehenkoten: ${spots.length}`);
+  const xs = fills.flatMap((s) => s.pts.map((p) => p[0]));
+  const zs = fills.flatMap((s) => s.pts.map((p) => p[1]));
+  console.log(`Ausdehnung: X ${Math.min(...xs).toFixed(1)} .. ${Math.max(...xs).toFixed(1)} m,  Z ${Math.min(...zs).toFixed(1)} .. ${Math.max(...zs).toFixed(1)} m`);
+}
+
+main();
diff --git a/tools/inspect-colors.mjs b/tools/inspect-colors.mjs
new file mode 100644
index 0000000..c550537
--- /dev/null
+++ b/tools/inspect-colors.mjs
@@ -0,0 +1,52 @@
+/**
+ * Listet alle Fuellfarben des Plans mit Flaeche, Anzahl Polygone und den
+ * naechstgelegenen Beschriftungen - Grundlage fuer die Farb-zu-Material-Zuordnung.
+ *
+ * Aufruf:  node tools/inspect-colors.mjs [minFlaeche]
+ */
+import fs from 'node:fs';
+import path from 'node:path';
+import { fileURLToPath } from 'node:url';
+
+const __dirname = path.dirname(fileURLToPath(import.meta.url));
+const data = JSON.parse(fs.readFileSync(path.join(__dirname, 'out', 'plan-raw.json'), 'utf8'));
+const MIN = parseFloat(process.argv[2] ?? '0.15');
+
+const centroid = (pts) => {
+  let x = 0, z = 0;
+  for (const p of pts) { x += p[0]; z += p[1]; }
+  return [x / pts.length, z / pts.length];
+};
+
+const groups = new Map();
+for (const s of data.shapes) {
+  if (s.op !== 'f') continue;
+  const g = groups.get(s.hex) ?? { hex: s.hex, n: 0, area: 0, big: [], circles: 0 };
+  g.n++; g.area += s.area;
+  if (s.circle) g.circles++;
+  if (s.area >= MIN) g.big.push(s);
+  groups.set(s.hex, g);
+}
+
+const rows = [...groups.values()].sort((a, b) => b.area - a.area);
+for (const g of rows) {
+  if (g.area < 0.2 && g.circles === 0) continue;
+  const near = new Set();
+  for (const s of g.big.slice(0, 6)) {
+    const [cx, cz] = centroid(s.pts);
+    const cands = data.labels
+      .map((l) => ({ l, d: Math.hypot(l.x - cx, l.z - cz) }))
+      .filter((c) => c.d < 3.5 && !/^-?\d\.\d{2}$/.test(c.l.text))
+      .sort((a, b) => a.d - b.d)
+      .slice(0, 3);
+    for (const c of cands) near.add(c.l.text);
+  }
+  console.log(
+    g.hex.padEnd(9),
+    ('n=' + g.n).padEnd(7),
+    (g.area.toFixed(1) + ' m2').padStart(9),
+    ('gross=' + g.big.length).padEnd(10),
+    ('kreise=' + g.circles).padEnd(11),
+    [...near].slice(0, 7).join(' / '),
+  );
+}
diff --git a/tools/inspect-heights.mjs b/tools/inspect-heights.mjs
new file mode 100644
index 0000000..32352be
--- /dev/null
+++ b/tools/inspect-heights.mjs
@@ -0,0 +1,16 @@
+import fs from 'node:fs'; import path from 'node:path'; import { fileURLToPath } from 'node:url';
+const __dirname = path.dirname(fileURLToPath(import.meta.url));
+const d = JSON.parse(fs.readFileSync(path.join(__dirname,'out','plan-raw.json'),'utf8'));
+console.log('--- Hoehenkoten (x, z, y) sortiert nach y ---');
+for (const s of [...d.spots].sort((a,b)=>a.y-b.y))
+  console.log(String(s.y.toFixed(2)).padStart(6), ' x='+String(s.x.toFixed(2)).padStart(7), ' z='+String(s.z.toFixed(2)).padStart(7));
+function inside(pt, poly){let c=false;for(let i=0,j=poly.length-1;i<poly.length;j=i++){const [xi,zi]=poly[i],[xj,zj]=poly[j];if((zi>pt[1])!==(zj>pt[1])&&pt[0]<(xj-xi)*(pt[1]-zi)/(zj-zi)+xi)c=!c;}return c;}
+console.log('\n--- Hoehenkoten je grosse Flaeche ---');
+const big = d.shapes.filter(s=>s.op==='f'&&s.area>=1.0&&s.hex!=='#000000').sort((a,b)=>b.area-a.area);
+for(const s of big){
+  const hits = d.spots.filter(sp=>inside([sp.x,sp.z], s.pts));
+  const nearby = d.spots.filter(sp=>!inside([sp.x,sp.z],s.pts)).map(sp=>({sp,dd:Math.min(...s.pts.map(p=>Math.hypot(p[0]-sp.x,p[1]-sp.z)))})).filter(o=>o.dd<0.6).map(o=>o.sp);
+  console.log(s.hex, String(s.area.toFixed(1)).padStart(6)+'m2',
+    'innen=['+hits.map(h=>h.y.toFixed(2)).join(' ')+']',
+    'rand=['+nearby.map(h=>h.y.toFixed(2)).join(' ')+']');
+}
diff --git a/tools/inspect-polys.mjs b/tools/inspect-polys.mjs
new file mode 100644
index 0000000..3f7ef94
--- /dev/null
+++ b/tools/inspect-polys.mjs
@@ -0,0 +1,14 @@
+import fs from 'node:fs'; import path from 'node:path'; import { fileURLToPath } from 'node:url';
+const __dirname = path.dirname(fileURLToPath(import.meta.url));
+const data = JSON.parse(fs.readFileSync(path.join(__dirname,'out','plan-raw.json'),'utf8'));
+const want = process.argv[2];
+const cent = (p)=>{let x=0,z=0;for(const q of p){x+=q[0];z+=q[1];}return[x/p.length,z/p.length];};
+const list = data.shapes.filter(s=>s.op==='f' && s.area>=parseFloat(process.argv[3]??'0.4') && (!want||s.hex===want));
+list.sort((a,b)=>b.area-a.area);
+for(const s of list){
+  const [cx,cz]=cent(s.pts);
+  const near=data.labels.map(l=>({l,d:Math.hypot(l.x-cx,l.z-cz)})).filter(c=>c.d<4&&!/^-?\d\.\d{2}$/.test(c.l.text)).sort((a,b)=>a.d-b.d).slice(0,4).map(c=>c.l.text);
+  let x0=1e9,z0=1e9,x1=-1e9,z1=-1e9; for(const [x,z] of s.pts){x0=Math.min(x0,x);x1=Math.max(x1,x);z0=Math.min(z0,z);z1=Math.max(z1,z);}
+  console.log(s.hex, String(s.area.toFixed(2)).padStart(7)+'m2', 'c=('+cx.toFixed(1)+','+cz.toFixed(1)+')', 'bb '+[x0,z0,x1,z1].map(v=>v.toFixed(1)).join(' '), 'n='+s.pts.length, '|', near.join(' / '));
+}
+console.log('total', list.length);
diff --git a/tsconfig.json b/tsconfig.json
new file mode 100644
index 0000000..d10bae3
--- /dev/null
+++ b/tsconfig.json
@@ -0,0 +1,19 @@
+{
+  "compilerOptions": {
+    "target": "ES2022",
+    "module": "ESNext",
+    "moduleResolution": "bundler",
+    "lib": ["ES2022", "DOM", "DOM.Iterable"],
+    "strict": true,
+    "noUnusedLocals": true,
+    "noUnusedParameters": true,
+    "noFallthroughCasesInSwitch": true,
+    "noImplicitOverride": true,
+    "skipLibCheck": true,
+    "isolatedModules": true,
+    "verbatimModuleSyntax": true,
+    "noEmit": true,
+    "types": []
+  },
+  "include": ["src"]
+}
diff --git a/vite.config.ts b/vite.config.ts
new file mode 100644
index 0000000..11aeb83
--- /dev/null
+++ b/vite.config.ts
@@ -0,0 +1,15 @@
+import { defineConfig } from 'vite';
+
+export default defineConfig({
+  base: './',
+  build: {
+    target: 'es2022',
+    chunkSizeWarningLimit: 1200,
+    rollupOptions: {
+      output: {
+        manualChunks: { three: ['three'] },
+      },
+    },
+  },
+  server: { host: true, port: 5173 },
+});