src/components/three/models/generated/EcoleModel.tsx

@@ -0,0 +1,161 @@
+import { useEffect, useRef } from "react";
+import * as THREE from "three";
+import { useGLTF } from "@react-three/drei";
+import { mergeGeometries } from "three/addons/utils/BufferGeometryUtils.js";
+import type { Vector3Tuple } from "@/types/three/three";
+
+const ECOLE_MODEL_PATH = "/models/ecole/model.gltf";
+
+interface EcoleModelProps {
+  position: Vector3Tuple;
+  rotation: Vector3Tuple;
+  scale: Vector3Tuple;
+  castShadow?: boolean;
+  receiveShadow?: boolean;
+  onLoaded?: () => void;
+}
+
+interface MergedMeshData {
+  geometry: THREE.BufferGeometry;
+  material: THREE.Material | THREE.Material[];
+}
+
+interface GeometryGroup {
+  geometries: THREE.BufferGeometry[];
+  material: THREE.Material | THREE.Material[];
+}
+
+function cloneMaterial(
+  material: THREE.Material | THREE.Material[],
+): THREE.Material | THREE.Material[] {
+  return Array.isArray(material)
+    ? material.map((item) => item.clone())
+    : material.clone();
+}
+
+function disposeMaterial(material: THREE.Material | THREE.Material[]): void {
+  if (Array.isArray(material)) {
+    for (const item of material) {
+      item.dispose();
+    }
+    return;
+  }
+
+  material.dispose();
+}
+
+function createGeometrySignature(geometry: THREE.BufferGeometry): string {
+  const attributes = Object.entries(geometry.attributes)
+    .map(([name, attribute]) => {
+      return `${name}:${attribute.itemSize}:${attribute.normalized}`;
+    })
+    .sort()
+    .join("|");
+
+  return `${geometry.index ? "indexed" : "non-indexed"}:${attributes}`;
+}
+
+function createMaterialKey(
+  material: THREE.Material | THREE.Material[],
+): string {
+  if (Array.isArray(material)) {
+    return material.map((item) => item.uuid).join("|");
+  }
+
+  return material.uuid;
+}
+
+function createMergedMeshes(scene: THREE.Group): MergedMeshData[] {
+  const groups = new Map<string, GeometryGroup>();
+
+  scene.updateMatrixWorld(true);
+  scene.traverse((child) => {
+    if (!(child instanceof THREE.Mesh)) return;
+
+    const geometry = child.geometry.clone();
+    geometry.applyMatrix4(child.matrixWorld);
+    const material = child.material;
+    const key = `${createMaterialKey(material)}:${createGeometrySignature(geometry)}`;
+    const group = groups.get(key);
+
+    if (group) {
+      group.geometries.push(geometry);
+      return;
+    }
+
+    groups.set(key, {
+      geometries: [geometry],
+      material: cloneMaterial(material),
+    });
+  });
+
+  return [...groups.values()].map((group) => {
+    if (group.geometries.length === 1) {
+      return {
+        geometry: group.geometries[0] as THREE.BufferGeometry,
+        material: group.material,
+      };
+    }
+
+    const geometry = mergeGeometries(group.geometries, false);
+
+    for (const sourceGeometry of group.geometries) {
+      sourceGeometry.dispose();
+    }
+
+    return {
+      geometry,
+      material: group.material,
+    };
+  });
+}
+
+export function EcoleModel({
+  position,
+  rotation,
+  scale,
+  castShadow = true,
+  receiveShadow = true,
+  onLoaded,
+}: EcoleModelProps): React.JSX.Element {
+  const { scene } = useGLTF(ECOLE_MODEL_PATH);
+  const groupRef = useRef<THREE.Group>(null);
+
+  useEffect(() => {
+    const group = groupRef.current;
+    if (!group) return;
+
+    const mergedMeshes = createMergedMeshes(scene);
+    const meshes = mergedMeshes.map((meshData) => {
+      const mesh = new THREE.Mesh(meshData.geometry, meshData.material);
+      mesh.castShadow = castShadow;
+      mesh.receiveShadow = receiveShadow;
+      return mesh;
+    });
+
+    for (const mesh of meshes) {
+      group.add(mesh);
+    }
+
+    onLoaded?.();
+
+    return () => {
+      for (const mesh of meshes) {
+        group.remove(mesh);
+        mesh.geometry.dispose();
+        disposeMaterial(mesh.material);
+      }
+    };
+  }, [castShadow, onLoaded, receiveShadow, scene]);
+
+  return (
+    <group
+      ref={groupRef}
+      position={position}
+      rotation={rotation}
+      scale={scale}
+    />
+  );
+}
+
+useGLTF.preload(ECOLE_MODEL_PATH);

src/world/GameMap.tsx

@@ -12,6 +12,8 @@ import { useClonedObject } from "@/hooks/three/useClonedObject";
 import { useLoggedGLTF } from "@/hooks/three/useLoggedGLTF";
 import { TerrainModel } from "@/components/three/world/TerrainModel";
 import { GameMapCollision } from "@/world/GameMapCollision";
+import { GeneratedMapNodeInstance } from "@/world/map-generated/GeneratedMapNodeInstance";
+import { isGeneratedMapModelName } from "@/world/map-generated/generatedMapModelConfig";
 import { MapInstancingSystem } from "@/world/map-instancing/MapInstancingSystem";
 import { isInstancedMapNodeName } from "@/world/map-instancing/mapInstancingConfig";
 import { VegetationSystem } from "@/world/vegetation/VegetationSystem";
@@ -274,11 +276,21 @@ function MapNodeInstance({
   modelUrl: string | null;
   onSettled: () => void;
 }): React.JSX.Element {
+  const isGeneratedModel = isGeneratedMapModelName(node.name);
+
   useEffect(() => {
-    if (modelUrl !== null) return;
+    if (modelUrl !== null || isGeneratedModel) return;
 
     onSettled();
-  }, [modelUrl, onSettled]);
+  }, [isGeneratedModel, modelUrl, onSettled]);
+
+  if (isGeneratedModel) {
+    return (
+      <Suspense fallback={<FallbackMapNode node={node} />}>
+        <GeneratedMapNodeInstance node={node} onLoaded={onSettled} />
+      </Suspense>
+    );
+  }
 
   if (!modelUrl) {
     return <FallbackMapNode node={node} />;

src/world/map-generated/GeneratedMapNodeInstance.tsx

@@ -0,0 +1,25 @@
+import { EcoleModel } from "@/components/three/models/generated/EcoleModel";
+import type { MapNode } from "@/types/editor/editor";
+
+interface GeneratedMapNodeInstanceProps {
+  node: MapNode;
+  onLoaded: () => void;
+}
+
+export function GeneratedMapNodeInstance({
+  node,
+  onLoaded,
+}: GeneratedMapNodeInstanceProps): React.JSX.Element | null {
+  if (node.name === "ecole") {
+    return (
+      <EcoleModel
+        position={node.position}
+        rotation={node.rotation}
+        scale={node.scale}
+        onLoaded={onLoaded}
+      />
+    );
+  }
+
+  return null;
+}

src/world/map-generated/generatedMapModelConfig.ts

@@ -0,0 +1,5 @@
+const GENERATED_MAP_MODEL_NAMES = new Set(["ecole"]);
+
+export function isGeneratedMapModelName(name: string): boolean {
+  return GENERATED_MAP_MODEL_NAMES.has(name);
+}