diff --git a/src/components/three/world/EcoleModel.tsx b/src/components/three/world/EcoleModel.tsx
new file mode 100644
index 0000000..75398ae
--- /dev/null
+++ b/src/components/three/world/EcoleModel.tsx
@@ -0,0 +1,20 @@
+import { useGLTF } from "@react-three/drei";
+import { MergedStaticMapModel } from "@/components/three/world/MergedStaticMapModel";
+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;
+}
+
+export function EcoleModel(props: EcoleModelProps): React.JSX.Element {
+  return <MergedStaticMapModel modelPath={ECOLE_MODEL_PATH} {...props} />;
+}
+
+useGLTF.preload(ECOLE_MODEL_PATH);
diff --git a/src/components/three/world/FermeVerticaleModel.tsx b/src/components/three/world/FermeVerticaleModel.tsx
new file mode 100644
index 0000000..44ed4bd
--- /dev/null
+++ b/src/components/three/world/FermeVerticaleModel.tsx
@@ -0,0 +1,24 @@
+import { useGLTF } from "@react-three/drei";
+import { MergedStaticMapModel } from "@/components/three/world/MergedStaticMapModel";
+import type { Vector3Tuple } from "@/types/three/three";
+
+const FERME_VERTICALE_MODEL_PATH = "/models/fermeverticale/model.gltf";
+
+interface FermeVerticaleModelProps {
+  position: Vector3Tuple;
+  rotation: Vector3Tuple;
+  scale: Vector3Tuple;
+  castShadow?: boolean;
+  receiveShadow?: boolean;
+  onLoaded?: () => void;
+}
+
+export function FermeVerticaleModel(
+  props: FermeVerticaleModelProps,
+): React.JSX.Element {
+  return (
+    <MergedStaticMapModel modelPath={FERME_VERTICALE_MODEL_PATH} {...props} />
+  );
+}
+
+useGLTF.preload(FERME_VERTICALE_MODEL_PATH);
diff --git a/src/components/three/world/GenerateurModel.tsx b/src/components/three/world/GenerateurModel.tsx
new file mode 100644
index 0000000..5b5cd39
--- /dev/null
+++ b/src/components/three/world/GenerateurModel.tsx
@@ -0,0 +1,22 @@
+import { useGLTF } from "@react-three/drei";
+import { MergedStaticMapModel } from "@/components/three/world/MergedStaticMapModel";
+import type { Vector3Tuple } from "@/types/three/three";
+
+const GENERATEUR_MODEL_PATH = "/models/generateur/model.gltf";
+
+interface GenerateurModelProps {
+  position: Vector3Tuple;
+  rotation: Vector3Tuple;
+  scale: Vector3Tuple;
+  castShadow?: boolean;
+  receiveShadow?: boolean;
+  onLoaded?: () => void;
+}
+
+export function GenerateurModel(
+  props: GenerateurModelProps,
+): React.JSX.Element {
+  return <MergedStaticMapModel modelPath={GENERATEUR_MODEL_PATH} {...props} />;
+}
+
+useGLTF.preload(GENERATEUR_MODEL_PATH);
diff --git a/src/components/three/world/LafabrikModel.tsx b/src/components/three/world/LafabrikModel.tsx
new file mode 100644
index 0000000..0c080b7
--- /dev/null
+++ b/src/components/three/world/LafabrikModel.tsx
@@ -0,0 +1,20 @@
+import { useGLTF } from "@react-three/drei";
+import { MergedStaticMapModel } from "@/components/three/world/MergedStaticMapModel";
+import type { Vector3Tuple } from "@/types/three/three";
+
+const LAFABRIK_MODEL_PATH = "/models/lafabrik/model.gltf";
+
+interface LafabrikModelProps {
+  position: Vector3Tuple;
+  rotation: Vector3Tuple;
+  scale: Vector3Tuple;
+  castShadow?: boolean;
+  receiveShadow?: boolean;
+  onLoaded?: () => void;
+}
+
+export function LafabrikModel(props: LafabrikModelProps): React.JSX.Element {
+  return <MergedStaticMapModel modelPath={LAFABRIK_MODEL_PATH} {...props} />;
+}
+
+useGLTF.preload(LAFABRIK_MODEL_PATH);
diff --git a/src/components/three/models/generated/EcoleModel.tsx b/src/components/three/world/MergedStaticMapModel.tsx
similarity index 87%
rename from src/components/three/models/generated/EcoleModel.tsx
rename to src/components/three/world/MergedStaticMapModel.tsx
index 970d16f..f2e75ae 100644
--- a/src/components/three/models/generated/EcoleModel.tsx
+++ b/src/components/three/world/MergedStaticMapModel.tsx
@@ -1,12 +1,13 @@
 import { useEffect, useRef } from "react";
-import * as THREE from "three";
 import { useGLTF } from "@react-three/drei";
+import { useThree } from "@react-three/fiber";
+import * as THREE from "three";
 import { mergeGeometries } from "three/addons/utils/BufferGeometryUtils.js";
 import type { Vector3Tuple } from "@/types/three/three";
+import { optimizeGLTFSceneTextures } from "@/utils/three/optimizeGLTFScene";
 
-const ECOLE_MODEL_PATH = "/models/ecole/model.gltf";
-
-interface EcoleModelProps {
+interface MergedStaticMapModelProps {
+  modelPath: string;
   position: Vector3Tuple;
   rotation: Vector3Tuple;
   scale: Vector3Tuple;
@@ -117,21 +118,26 @@ function createMergedMeshes(scene: THREE.Group): MergedMeshData[] {
     .filter((meshData): meshData is MergedMeshData => meshData !== null);
 }
 
-export function EcoleModel({
+export function MergedStaticMapModel({
+  modelPath,
   position,
   rotation,
   scale,
   castShadow = true,
   receiveShadow = true,
   onLoaded,
-}: EcoleModelProps): React.JSX.Element {
-  const { scene } = useGLTF(ECOLE_MODEL_PATH);
+}: MergedStaticMapModelProps): React.JSX.Element {
+  const { scene } = useGLTF(modelPath);
+  const maxAnisotropy = useThree((state) =>
+    state.gl.capabilities.getMaxAnisotropy(),
+  );
   const groupRef = useRef<THREE.Group>(null);
 
   useEffect(() => {
     const group = groupRef.current;
     if (!group) return;
 
+    optimizeGLTFSceneTextures(scene, maxAnisotropy);
     const mergedMeshes = createMergedMeshes(scene);
     const meshes = mergedMeshes.map((meshData) => {
       const mesh = new THREE.Mesh(meshData.geometry, meshData.material);
@@ -153,7 +159,7 @@ export function EcoleModel({
         disposeMaterial(mesh.material);
       }
     };
-  }, [castShadow, onLoaded, receiveShadow, scene]);
+  }, [castShadow, maxAnisotropy, modelPath, onLoaded, receiveShadow, scene]);
 
   return (
     <group
@@ -164,5 +170,3 @@ export function EcoleModel({
     />
   );
 }
-
-useGLTF.preload(ECOLE_MODEL_PATH);
diff --git a/src/components/three/world/TerrainModel.tsx b/src/components/three/world/TerrainModel.tsx
index 34de05c..c1f2a29 100644
--- a/src/components/three/world/TerrainModel.tsx
+++ b/src/components/three/world/TerrainModel.tsx
@@ -1,7 +1,9 @@
 import { useEffect, useMemo, useRef } from "react";
 import * as THREE from "three";
 import { useGLTF } from "@react-three/drei";
+import { useThree } from "@react-three/fiber";
 import type { Vector3Tuple } from "@/types/three/three";
+import { optimizeGLTFSceneTextures } from "@/utils/three/optimizeGLTFScene";
 
 const TERRAIN_MODEL_PATH = "/models/terrain/model.gltf";
 const TERRAIN_DEFAULT_POSITION: Vector3Tuple = [0, 0, 0];
@@ -39,12 +41,16 @@ export function TerrainModel({
   const internalRef = useRef<THREE.Group>(null);
   const ref = groupRef ?? internalRef;
   const { scene } = useGLTF(TERRAIN_MODEL_PATH);
+  const maxAnisotropy = useThree((state) =>
+    state.gl.capabilities.getMaxAnisotropy(),
+  );
 
   const terrainModel = useMemo(() => {
+    optimizeGLTFSceneTextures(scene, maxAnisotropy);
     const model = scene.clone(true);
     applyTerrainMaterialSettings(model, receiveShadow);
     return model;
-  }, [scene, receiveShadow]);
+  }, [maxAnisotropy, scene, receiveShadow]);
 
   useEffect(() => {
     onLoaded?.();
diff --git a/src/data/world/fogConfig.ts b/src/data/world/fogConfig.ts
index edf90e6..7df1d7e 100644
--- a/src/data/world/fogConfig.ts
+++ b/src/data/world/fogConfig.ts
@@ -2,16 +2,16 @@ import { TERRAIN_COLORS } from "@/data/world/terrainConfig";
 
 export const FOG_CONFIG = {
   enabled: true,
-  color: "#c8dbbe",
-  near: 34,
-  far: 58,
+  color: "#eef3f5",
+  near: 38,
+  far: 45,
 };
 
 export const CHUNK_CONFIG = {
   enabled: true,
   chunkSize: 35,
   loadRadius: 45,
-  unloadRadius: 58,
+  unloadRadius: 45,
   updateInterval: 350,
 };
 
diff --git a/src/hooks/three/useLoggedGLTF.ts b/src/hooks/three/useLoggedGLTF.ts
index 8e08ce3..8b535d9 100644
--- a/src/hooks/three/useLoggedGLTF.ts
+++ b/src/hooks/three/useLoggedGLTF.ts
@@ -1,18 +1,27 @@
 import { useEffect, useRef } from "react";
 import { useGLTF } from "@react-three/drei";
+import { useThree } from "@react-three/fiber";
 import {
   logModelLoadSuccess,
   type ModelLoadLogContext,
 } from "@/utils/three/modelLoadLogger";
+import { optimizeGLTFSceneTextures } from "@/utils/three/optimizeGLTFScene";
 
 export function useLoggedGLTF(
   modelPath: string,
   context: Omit<ModelLoadLogContext, "modelPath">,
 ) {
   const gltf = useGLTF(modelPath);
+  const maxAnisotropy = useThree((state) =>
+    state.gl.capabilities.getMaxAnisotropy(),
+  );
   const hasLoggedRef = useRef(false);
   const { position, rotation, scale, scope } = context;
 
+  useEffect(() => {
+    optimizeGLTFSceneTextures(gltf.scene, maxAnisotropy);
+  }, [gltf.scene, maxAnisotropy]);
+
   useEffect(() => {
     if (hasLoggedRef.current) return;
 
diff --git a/src/hooks/three/useTerrainHeight.ts b/src/hooks/three/useTerrainHeight.ts
new file mode 100644
index 0000000..5587962
--- /dev/null
+++ b/src/hooks/three/useTerrainHeight.ts
@@ -0,0 +1,64 @@
+import { useMemo } from "react";
+import { useGLTF } from "@react-three/drei";
+import * as THREE from "three";
+import type { Vector3Tuple } from "@/types/three/three";
+
+const TERRAIN_MODEL_PATH = "/models/terrain/model.gltf";
+const RAYCAST_Y = 500;
+const RAYCAST_FAR = 1000;
+const DOWN = new THREE.Vector3(0, -1, 0);
+
+interface TerrainHeightSampler {
+  getHeight: (x: number, z: number) => number | null;
+}
+
+function createTerrainHeightSampler(
+  scene: THREE.Object3D,
+): TerrainHeightSampler {
+  const meshes: THREE.Mesh[] = [];
+  const raycaster = new THREE.Raycaster(
+    new THREE.Vector3(),
+    DOWN,
+    0,
+    RAYCAST_FAR,
+  );
+
+  scene.updateMatrixWorld(true);
+  scene.traverse((child) => {
+    if (child instanceof THREE.Mesh) {
+      meshes.push(child);
+    }
+  });
+
+  return {
+    getHeight: (x, z) => {
+      raycaster.set(new THREE.Vector3(x, RAYCAST_Y, z), DOWN);
+      const hit = raycaster.intersectObjects(meshes, false)[0];
+      return hit?.point.y ?? null;
+    },
+  };
+}
+
+export function useTerrainHeightSampler(): TerrainHeightSampler {
+  const { scene } = useGLTF(TERRAIN_MODEL_PATH);
+
+  return useMemo(() => createTerrainHeightSampler(scene), [scene]);
+}
+
+export function useTerrainSnappedPosition(
+  position: Vector3Tuple,
+): Vector3Tuple {
+  const terrainHeight = useTerrainHeightSampler();
+
+  return useMemo(() => {
+    const [x, y, z] = position;
+    const height = terrainHeight.getHeight(x, z);
+    return [x, height ?? y, z];
+  }, [position, terrainHeight]);
+}
+
+export function normalizeMapScale(scale: Vector3Tuple): Vector3Tuple {
+  const [x, y, z] = scale;
+  const isUniform = Math.abs(x - y) < 0.001 && Math.abs(x - z) < 0.001;
+  return isUniform ? scale : [x, x, x];
+}
diff --git a/src/utils/three/optimizeGLTFScene.ts b/src/utils/three/optimizeGLTFScene.ts
new file mode 100644
index 0000000..710ebbb
--- /dev/null
+++ b/src/utils/three/optimizeGLTFScene.ts
@@ -0,0 +1,68 @@
+import * as THREE from "three";
+
+const TEXTURE_KEYS = [
+  "map",
+  "alphaMap",
+  "aoMap",
+  "bumpMap",
+  "displacementMap",
+  "emissiveMap",
+  "envMap",
+  "lightMap",
+  "metalnessMap",
+  "normalMap",
+  "roughnessMap",
+] as const;
+
+type TextureKey = (typeof TEXTURE_KEYS)[number];
+type TexturedMaterial = THREE.Material &
+  Partial<Record<TextureKey, THREE.Texture>>;
+
+const optimizedTextures = new WeakSet<THREE.Texture>();
+
+function optimizeTexture(texture: THREE.Texture, maxAnisotropy: number): void {
+  if (optimizedTextures.has(texture)) return;
+
+  optimizedTextures.add(texture);
+  texture.anisotropy = Math.min(4, Math.max(1, maxAnisotropy));
+
+  if (!(texture instanceof THREE.CompressedTexture)) {
+    texture.generateMipmaps = true;
+    texture.minFilter = THREE.LinearMipmapLinearFilter;
+    texture.magFilter = THREE.LinearFilter;
+  }
+
+  texture.needsUpdate = true;
+}
+
+function optimizeMaterialTextures(
+  material: THREE.Material,
+  maxAnisotropy: number,
+): void {
+  const texturedMaterial = material as TexturedMaterial;
+
+  for (const key of TEXTURE_KEYS) {
+    const texture = texturedMaterial[key];
+    if (texture instanceof THREE.Texture) {
+      optimizeTexture(texture, maxAnisotropy);
+    }
+  }
+}
+
+export function optimizeGLTFSceneTextures(
+  scene: THREE.Object3D,
+  maxAnisotropy: number,
+): void {
+  scene.traverse((child) => {
+    if (!(child instanceof THREE.Mesh)) return;
+
+    if (Array.isArray(child.material)) {
+      for (const material of child.material) {
+        optimizeMaterialTextures(material, maxAnisotropy);
+      }
+      return;
+    }
+
+    optimizeMaterialTextures(child.material, maxAnisotropy);
+  });
+}
diff --git a/src/world/GameMap.tsx b/src/world/GameMap.tsx
index 03c842c..de446e2 100644
--- a/src/world/GameMap.tsx
+++ b/src/world/GameMap.tsx
@@ -10,6 +10,10 @@ import {
 import * as THREE from "three";
 import { useClonedObject } from "@/hooks/three/useClonedObject";
 import { useLoggedGLTF } from "@/hooks/three/useLoggedGLTF";
+import {
+  normalizeMapScale,
+  useTerrainSnappedPosition,
+} from "@/hooks/three/useTerrainHeight";
 import { TerrainModel } from "@/components/three/world/TerrainModel";
 import {
   isMapModelVisible,
@@ -33,7 +37,7 @@ interface LoadedMapNode {
   modelUrl: string | null;
 }
 
-const MAP_STRUCTURE_NODE_NAMES = new Set(["Scene", "blocking"]);
+const MAP_STRUCTURE_NODE_NAMES = new Set(["Scene", "blocking", "terrain"]);
 const LITE_MAP_SKIPPED_NODE_NAMES = new Set([
   "arbre",
   "buisson",
@@ -333,11 +337,13 @@ function ModelInstance({
   onLoaded: () => void;
 }): React.JSX.Element {
   const { position, rotation, scale } = node;
+  const snappedPosition = useTerrainSnappedPosition(position);
+  const normalizedScale = normalizeMapScale(scale);
   const { scene } = useLoggedGLTF(modelUrl, {
     scope: "GameMap.ModelInstance",
-    position,
+    position: snappedPosition,
     rotation,
-    scale,
+    scale: normalizedScale,
   });
   const sceneInstance = useClonedObject(scene);
 
@@ -354,18 +360,19 @@ function ModelInstance({
   return (
     <primitive
       object={sceneInstance}
-      position={position}
+      position={snappedPosition}
       rotation={rotation}
-      scale={scale}
+      scale={normalizedScale}
     />
   );
 }
 
 function FallbackMapNode({ node }: { node: MapNode }): React.JSX.Element {
   const { position, rotation, scale } = node;
+  const normalizedScale = normalizeMapScale(scale);
 
   return (
-    <mesh position={position} rotation={rotation} scale={scale}>
+    <mesh position={position} rotation={rotation} scale={normalizedScale}>
       <boxGeometry args={[1, 1, 1]} />
       <meshStandardMaterial color="#64748b" wireframe />
     </mesh>
diff --git a/src/world/map-generated/GeneratedMapNodeInstance.tsx b/src/world/map-generated/GeneratedMapNodeInstance.tsx
index bf87b21..5f1e5bb 100644
--- a/src/world/map-generated/GeneratedMapNodeInstance.tsx
+++ b/src/world/map-generated/GeneratedMapNodeInstance.tsx
@@ -1,4 +1,11 @@
-import { EcoleModel } from "@/components/three/models/generated/EcoleModel";
+import { EcoleModel } from "@/components/three/world/EcoleModel";
+import { FermeVerticaleModel } from "@/components/three/world/FermeVerticaleModel";
+import { GenerateurModel } from "@/components/three/world/GenerateurModel";
+import { LafabrikModel } from "@/components/three/world/LafabrikModel";
+import {
+  normalizeMapScale,
+  useTerrainSnappedPosition,
+} from "@/hooks/three/useTerrainHeight";
 import type { MapNode } from "@/types/editor/editor";
 
 interface GeneratedMapNodeInstanceProps {
@@ -10,12 +17,48 @@ export function GeneratedMapNodeInstance({
   node,
   onLoaded,
 }: GeneratedMapNodeInstanceProps): React.JSX.Element | null {
+  const position = useTerrainSnappedPosition(node.position);
+  const scale = normalizeMapScale(node.scale);
+
   if (node.name === "ecole") {
     return (
       <EcoleModel
-        position={node.position}
+        position={position}
         rotation={node.rotation}
-        scale={node.scale}
+        scale={scale}
+        onLoaded={onLoaded}
+      />
+    );
+  }
+
+  if (node.name === "fermeverticale") {
+    return (
+      <FermeVerticaleModel
+        position={position}
+        rotation={node.rotation}
+        scale={scale}
+        onLoaded={onLoaded}
+      />
+    );
+  }
+
+  if (node.name === "generateur") {
+    return (
+      <GenerateurModel
+        position={position}
+        rotation={node.rotation}
+        scale={scale}
+        onLoaded={onLoaded}
+      />
+    );
+  }
+
+  if (node.name === "lafabrik") {
+    return (
+      <LafabrikModel
+        position={position}
+        rotation={node.rotation}
+        scale={scale}
         onLoaded={onLoaded}
       />
     );
diff --git a/src/world/map-generated/generatedMapModelConfig.ts b/src/world/map-generated/generatedMapModelConfig.ts
index 686d295..878daa1 100644
--- a/src/world/map-generated/generatedMapModelConfig.ts
+++ b/src/world/map-generated/generatedMapModelConfig.ts
@@ -1,4 +1,9 @@
-const GENERATED_MAP_MODEL_NAMES = new Set(["ecole"]);
+const GENERATED_MAP_MODEL_NAMES = new Set([
+  "ecole",
+  "fermeverticale",
+  "generateur",
+  "lafabrik",
+]);
 
 export function isGeneratedMapModelName(name: string): boolean {
   return GENERATED_MAP_MODEL_NAMES.has(name);
diff --git a/src/world/map-instancing/InstancedMapAsset.tsx b/src/world/map-instancing/InstancedMapAsset.tsx
index dfd695f..38dd5c6 100644
--- a/src/world/map-instancing/InstancedMapAsset.tsx
+++ b/src/world/map-instancing/InstancedMapAsset.tsx
@@ -1,7 +1,13 @@
-import { useEffect, useRef } from "react";
+import { useEffect, useMemo, useRef } from "react";
 import * as THREE from "three";
 import { useGLTF } from "@react-three/drei";
+import { useThree } from "@react-three/fiber";
 import { mergeGeometries } from "three/addons/utils/BufferGeometryUtils.js";
+import {
+  normalizeMapScale,
+  useTerrainHeightSampler,
+} from "@/hooks/three/useTerrainHeight";
+import { optimizeGLTFSceneTextures } from "@/utils/three/optimizeGLTFScene";
 import type { MapAssetInstance } from "@/world/map-instancing/useMapInstancingData";
 
 interface InstancedMapAssetProps {
@@ -153,21 +159,40 @@ export function InstancedMapAsset({
   receiveShadow,
 }: InstancedMapAssetProps): React.JSX.Element | null {
   const { scene } = useGLTF(modelPath);
+  const terrainHeight = useTerrainHeightSampler();
+  const maxAnisotropy = useThree((state) =>
+    state.gl.capabilities.getMaxAnisotropy(),
+  );
   const groupRef = useRef<THREE.Group>(null);
+  const groundedInstances = useMemo(
+    () =>
+      instances.map((instance) => {
+        const [x, y, z] = instance.position;
+        const height = terrainHeight.getHeight(x, z);
+
+        return {
+          ...instance,
+          position: [x, height ?? y, z] as MapAssetInstance["position"],
+          scale: normalizeMapScale(instance.scale),
+        };
+      }),
+    [instances, terrainHeight],
+  );
 
   useEffect(() => {
     const group = groupRef.current;
-    if (!group || instances.length === 0) return;
+    if (!group || groundedInstances.length === 0) return;
 
+    optimizeGLTFSceneTextures(scene, maxAnisotropy);
     const meshDataList = extractMeshes(scene);
     const instancedMeshes = meshDataList.map((meshData, index) => {
       const instancedMesh = new THREE.InstancedMesh(
         meshData.geometry,
         meshData.material,
-        instances.length,
+        groundedInstances.length,
       );
 
-      setInstanceMatrices(instancedMesh, instances);
+      setInstanceMatrices(instancedMesh, groundedInstances);
       instancedMesh.castShadow = castShadow;
       instancedMesh.receiveShadow = receiveShadow;
       instancedMesh.name = `instanced-map-asset-${index}`;
@@ -187,7 +212,7 @@ export function InstancedMapAsset({
         disposeInstancedMapMesh(mesh);
       }
     };
-  }, [castShadow, instances, receiveShadow, scene]);
+  }, [castShadow, groundedInstances, maxAnisotropy, receiveShadow, scene]);
 
   if (instances.length === 0) {
     return null;
diff --git a/src/world/map-instancing/mapInstancingConfig.ts b/src/world/map-instancing/mapInstancingConfig.ts
index 0b8b02b..77aa728 100644
--- a/src/world/map-instancing/mapInstancingConfig.ts
+++ b/src/world/map-instancing/mapInstancingConfig.ts
@@ -1,25 +1,4 @@
 export const MAP_INSTANCING_ASSETS = {
-  generateur: {
-    mapName: "generateur",
-    modelPath: "/models/generateur/model.gltf",
-    castShadow: true,
-    receiveShadow: true,
-    enabled: true,
-  },
-  lafabrik: {
-    mapName: "lafabrik",
-    modelPath: "/models/lafabrik/model.gltf",
-    castShadow: true,
-    receiveShadow: true,
-    enabled: true,
-  },
-  fermeverticale: {
-    mapName: "fermeverticale",
-    modelPath: "/models/fermeverticale/model.gltf",
-    castShadow: true,
-    receiveShadow: true,
-    enabled: true,
-  },
   boiteauxlettres: {
     mapName: "boiteauxlettres",
     modelPath: "/models/boiteauxlettres/model.gltf",
diff --git a/src/world/vegetation/InstancedVegetation.tsx b/src/world/vegetation/InstancedVegetation.tsx
index 847ebfc..ff8598a 100644
--- a/src/world/vegetation/InstancedVegetation.tsx
+++ b/src/world/vegetation/InstancedVegetation.tsx
@@ -1,12 +1,16 @@
 import { useEffect, useMemo, useRef } from "react";
 import * as THREE from "three";
 import { useGLTF } from "@react-three/drei";
+import { useThree } from "@react-three/fiber";
 import { mergeGeometries } from "three/addons/utils/BufferGeometryUtils.js";
+import { useTerrainHeightSampler } from "@/hooks/three/useTerrainHeight";
+import { optimizeGLTFSceneTextures } from "@/utils/three/optimizeGLTFScene";
 import type { VegetationInstance } from "@/world/vegetation/useVegetationData";
 
 interface InstancedVegetationProps {
   modelPath: string;
   instances: VegetationInstance[];
+  scaleMultiplier: number;
   castShadow: boolean;
   receiveShadow: boolean;
 }
@@ -70,12 +74,17 @@ function extractMeshes(scene: THREE.Group): MeshData[] {
 
 function createInstanceMatrices(
   instances: VegetationInstance[],
+  scaleMultiplier: number,
 ): THREE.Matrix4[] {
   const matrices: THREE.Matrix4[] = [];
   const position = new THREE.Vector3();
   const rotation = new THREE.Euler();
   const quaternion = new THREE.Quaternion();
-  const scale = new THREE.Vector3(1, 1, 1);
+  const scale = new THREE.Vector3(
+    scaleMultiplier,
+    scaleMultiplier,
+    scaleMultiplier,
+  );
 
   for (const instance of instances) {
     const matrix = new THREE.Matrix4();
@@ -93,16 +102,36 @@ function createInstanceMatrices(
 export function InstancedVegetation({
   modelPath,
   instances,
+  scaleMultiplier,
   castShadow,
   receiveShadow,
 }: InstancedVegetationProps): React.JSX.Element | null {
   const { scene } = useGLTF(modelPath);
+  const terrainHeight = useTerrainHeightSampler();
+  const maxAnisotropy = useThree((state) =>
+    state.gl.capabilities.getMaxAnisotropy(),
+  );
   const groupRef = useRef<THREE.Group>(null);
 
-  const meshDataList = useMemo(() => extractMeshes(scene), [scene]);
+  const meshDataList = useMemo(() => {
+    optimizeGLTFSceneTextures(scene, maxAnisotropy);
+    return extractMeshes(scene);
+  }, [maxAnisotropy, scene]);
+  const groundedInstances = useMemo(
+    () =>
+      instances.map((instance) => {
+        const [x, y, z] = instance.position;
+        const height = terrainHeight.getHeight(x, z);
+        return {
+          ...instance,
+          position: [x, height ?? y, z] as VegetationInstance["position"],
+        };
+      }),
+    [instances, terrainHeight],
+  );
   const matrices = useMemo(
-    () => createInstanceMatrices(instances),
-    [instances],
+    () => createInstanceMatrices(groundedInstances, scaleMultiplier),
+    [groundedInstances, scaleMultiplier],
   );
 
   const instancedMeshes = useMemo(() => {
@@ -110,7 +139,7 @@ export function InstancedVegetation({
       const instancedMesh = new THREE.InstancedMesh(
         meshData.geometry,
         meshData.material,
-        instances.length,
+        groundedInstances.length,
       );
 
       for (let i = 0; i < matrices.length; i++) {
@@ -129,7 +158,13 @@ export function InstancedVegetation({
 
       return instancedMesh;
     });
-  }, [meshDataList, matrices, instances.length, castShadow, receiveShadow]);
+  }, [
+    meshDataList,
+    matrices,
+    groundedInstances.length,
+    castShadow,
+    receiveShadow,
+  ]);
 
   useEffect(() => {
     const group = groupRef.current;
@@ -162,7 +197,7 @@ export function InstancedVegetation({
     };
   }, [meshDataList]);
 
-  if (instances.length === 0) {
+  if (groundedInstances.length === 0) {
     return null;
   }
 
diff --git a/src/world/vegetation/VegetationSystem.tsx b/src/world/vegetation/VegetationSystem.tsx
index 1684a96..cb84d67 100644
--- a/src/world/vegetation/VegetationSystem.tsx
+++ b/src/world/vegetation/VegetationSystem.tsx
@@ -21,6 +21,7 @@ interface VegetationChunk {
   key: string;
   type: VegetationType;
   modelPath: string;
+  scaleMultiplier: number;
   castShadow: boolean;
   receiveShadow: boolean;
   centerX: number;
@@ -66,6 +67,7 @@ function createVegetationChunks(
       key: `${type}:${chunkKey}`,
       type,
       modelPath: config.modelPath,
+      scaleMultiplier: config.scaleMultiplier,
       castShadow: config.castShadow,
       receiveShadow: config.receiveShadow,
       centerX: center.x / chunkInstances.length,
@@ -103,6 +105,10 @@ export function VegetationSystem(): React.JSX.Element | null {
     });
   }, [data, groups, models]);
 
+  const visibleChunks = streamingEnabled
+    ? chunks.filter((chunk) => activeChunkKeys.has(chunk.key))
+    : chunks;
+
   useFrame(({ clock }) => {
     if (!streamingEnabled) return;
 
@@ -143,10 +149,6 @@ export function VegetationSystem(): React.JSX.Element | null {
     return null;
   }
 
-  const visibleChunks = streamingEnabled
-    ? chunks.filter((chunk) => activeChunkKeys.has(chunk.key))
-    : chunks;
-
   return (
     <group name="vegetation-system">
       {visibleChunks.map((chunk) => (
@@ -154,6 +156,7 @@ export function VegetationSystem(): React.JSX.Element | null {
           <InstancedVegetation
             modelPath={chunk.modelPath}
             instances={chunk.instances}
+            scaleMultiplier={chunk.scaleMultiplier}
             castShadow={chunk.castShadow}
             receiveShadow={chunk.receiveShadow}
           />
diff --git a/src/world/vegetation/vegetationConfig.ts b/src/world/vegetation/vegetationConfig.ts
index b279fea..a49fcec 100644
--- a/src/world/vegetation/vegetationConfig.ts
+++ b/src/world/vegetation/vegetationConfig.ts
@@ -8,6 +8,7 @@ export const VEGETATION_TYPES = {
   buissons: {
     mapName: "buisson",
     modelPath: "/models/buisson/model.gltf",
+    scaleMultiplier: 2,
     castShadow: true,
     receiveShadow: true,
     enabled: true,
@@ -15,6 +16,7 @@ export const VEGETATION_TYPES = {
   sapin: {
     mapName: "sapin",
     modelPath: "/models/sapin/model.gltf",
+    scaleMultiplier: 2,
     castShadow: true,
     receiveShadow: true,
     enabled: true,
@@ -22,6 +24,7 @@ export const VEGETATION_TYPES = {
   arbre: {
     mapName: "arbre",
     modelPath: "/models/arbre/model.gltf",
+    scaleMultiplier: 1,
     castShadow: true,
     receiveShadow: true,
     enabled: true,
@@ -29,6 +32,7 @@ export const VEGETATION_TYPES = {
   champdeble: {
     mapName: "champdeble",
     modelPath: "/models/champdeble/model.gltf",
+    scaleMultiplier: 1,
     castShadow: true,
     receiveShadow: true,
     enabled: true,
@@ -36,6 +40,7 @@ export const VEGETATION_TYPES = {
   champdesoja: {
     mapName: "champdesoja",
     modelPath: "/models/champdesoja/model.gltf",
+    scaleMultiplier: 1,
     castShadow: true,
     receiveShadow: true,
     enabled: true,
@@ -43,6 +48,7 @@ export const VEGETATION_TYPES = {
   champsdetournesol: {
     mapName: "champsdetournesol",
     modelPath: "/models/champsdetournesol/model.gltf",
+    scaleMultiplier: 1,
     castShadow: true,
     receiveShadow: true,
     enabled: true,