Update index.html

index.html

@@ -20,288 +20,75 @@
     <script type="module">
         import * as THREE from 'three';
 
-        // --- Variables ---
+        // ... (Keep all variables: scene, camera, renderer, playerMesh, etc.) ...
         let scene, camera, renderer, playerMesh;
         let raycaster, mouse;
         const keysPressed = {};
         const playerSpeed = 0.15;
-        let newlyPlacedObjects = []; // For sessionStorage
+        let newlyPlacedObjects = []; // For sessionStorage persistence between non-save reruns
         const placeholderPlots = new Set();
         const groundMeshes = {};
-        const allRenderedObjects = {}; // Tracks all current objects by ID
+        const allRenderedObjects = {}; // Track all scene objects: id -> mesh/group
 
         const SESSION_STORAGE_KEY = 'unsavedDbWorldState_v2';
 
-        // --- State from Python ---
-        const allInitialObjects = window.ALL_INITIAL_OBJECTS || [];
-        const plotsMetadata = window.PLOTS_METADATA || [];
+        // --- Access State from Streamlit ---
+        const allInitialObjects = window.ALL_INITIAL_OBJECTS || []; // From DB
+        const plotsMetadata = window.PLOTS_METADATA || []; // From DB
         const selectedObjectType = window.SELECTED_OBJECT_TYPE || "None";
         const plotWidth = window.PLOT_WIDTH || 50.0;
         const plotDepth = window.PLOT_DEPTH || 50.0;
 
-        // --- Materials ---
         const groundMaterial = new THREE.MeshStandardMaterial({ color: 0x55aa55, roughness: 0.9, metalness: 0.1, side: THREE.DoubleSide });
         const placeholderGroundMaterial = new THREE.MeshStandardMaterial({ color: 0x448844, roughness: 0.95, metalness: 0.1, side: THREE.DoubleSide });
 
-        // --- Initialization ---
-        function init() {
-            scene = new THREE.Scene();
-            scene.background = new THREE.Color(0xabcdef);
-
-            const aspect = window.innerWidth / window.innerHeight;
-            camera = new THREE.PerspectiveCamera(60, aspect, 0.1, 4000);
-            camera.position.set(plotWidth / 2, 15, plotDepth / 2 + 20); // Start looking at first plot
-            camera.lookAt(plotWidth / 2, 0, plotDepth/2);
-            scene.add(camera);
-
-            setupLighting();
-            setupInitialGround(); // Creates ground based on plotsMetadata
-            setupPlayer();
 
-            raycaster = new THREE.Raycaster();
-            mouse = new THREE.Vector2();
-
-            renderer = new THREE.WebGLRenderer({ antialias: true });
-            renderer.setSize(window.innerWidth, window.innerHeight);
-            renderer.shadowMap.enabled = true;
-            renderer.shadowMap.type = THREE.PCFSoftShadowMap;
-            document.body.appendChild(renderer.domElement);
+        // --- init() function ---
+        function init() {
+            // ... (scene, camera, renderer setup as before) ...
+             scene = new THREE.Scene(); scene.background = new THREE.Color(0xabcdef);
+             const aspect = window.innerWidth / window.innerHeight; camera = new THREE.PerspectiveCamera(60, aspect, 0.1, 4000); camera.position.set(0, 15, 20); camera.lookAt(0, 0, 0); scene.add(camera);
+             setupLighting(); setupInitialGround(); setupPlayer();
+             raycaster = new THREE.Raycaster(); mouse = new THREE.Vector2();
+             renderer = new THREE.WebGLRenderer({ antialias: true }); renderer.setSize(window.innerWidth, window.innerHeight); renderer.shadowMap.enabled = true; renderer.shadowMap.type = THREE.PCFSoftShadowMap; document.body.appendChild(renderer.domElement);
 
-            loadInitialObjects(); // Loads objects from DB data
-            restoreUnsavedState(); // Loads unsaved from sessionStorage
+            loadInitialObjects(); // Load from DB data
+            restoreUnsavedState(); // Restore from SessionStorage
 
             // Event Listeners
-            document.addEventListener('mousemove', onMouseMove, false);
-            document.addEventListener('click', onDocumentClick, false);
-            window.addEventListener('resize', onWindowResize, false);
-            document.addEventListener('keydown', onKeyDown);
-            document.addEventListener('keyup', onKeyUp);
+            document.addEventListener('mousemove', onMouseMove, false); document.addEventListener('click', onDocumentClick, false); window.addEventListener('resize', onWindowResize, false); document.addEventListener('keydown', onKeyDown); document.addEventListener('keyup', onKeyUp);
 
-            // Define global functions for Python
+            // Define global functions needed by Python
             window.teleportPlayer = teleportPlayer;
-            window.getSaveDataAndPosition = getSaveDataAndPosition;
+            window.getSaveDataAndPosition = getSaveDataAndPosition; // Ensure this is defined correctly below
+            // window.resetNewlyPlacedObjects = resetNewlyPlacedObjects; // No longer needed
 
             console.log("Three.js Initialized (DB Backend v2). World ready.");
             animate();
         }
 
-        // --- Setup Functions ---
-        function setupLighting() { const a=new THREE.AmbientLight(0xffffff,0.5); scene.add(a); const d=new THREE.DirectionalLight(0xffffff,1.0); d.position.set(50,150,100); d.castShadow=true; d.shadow.mapSize.width=4096; d.shadow.mapSize.height=4096; d.shadow.camera.near=0.5; d.shadow.camera.far=500; d.shadow.camera.left=-150; d.shadow.camera.right=150; d.shadow.camera.top=150; d.shadow.camera.bottom=-150; d.shadow.bias=-0.001; scene.add(d); }
-        function setupInitialGround() { plotsMetadata.forEach(p => {createGroundPlane(p.grid_x,p.grid_z,false);}); if(plotsMetadata.length===0) {createGroundPlane(0,0,false);} }
-        function createGroundPlane(gx,gz,isPlaceholder) { const k=`${gx}_${gz}`; if(groundMeshes[k]) return; const geo=new THREE.PlaneGeometry(plotWidth,plotDepth); const mat=isPlaceholder?placeholderGroundMaterial:groundMaterial; const mesh=new THREE.Mesh(geo,mat); mesh.rotation.x=-Math.PI/2; mesh.position.y=-0.05; mesh.position.x=gx*plotWidth+plotWidth/2; mesh.position.z=gz*plotDepth+plotDepth/2; mesh.receiveShadow=true; mesh.userData.gridKey=k; scene.add(mesh); groundMeshes[k]=mesh; if(isPlaceholder){placeholderPlots.add(k);} }
-        function setupPlayer() { const g=new THREE.CapsuleGeometry(0.4,0.8,4,8); const m=new THREE.MeshStandardMaterial({color:0x0000ff,roughness:0.6}); playerMesh=new THREE.Mesh(g,m); playerMesh.position.set(plotWidth/2, 0.8, plotDepth/2); playerMesh.castShadow=true; playerMesh.receiveShadow=true; scene.add(playerMesh); }
-
-        // --- Object Loading / State Management ---
-        function loadInitialObjects() { console.log(`Loading ${allInitialObjects.length} initial objects.`); clearAllRenderedObjects(); allInitialObjects.forEach(d => { createAndPlaceObject(d, false); }); console.log("Finished initial load."); }
-        function clearAllRenderedObjects() { Object.values(allRenderedObjects).forEach(o => { if(o.parent) o.parent.remove(o); /* Remove safely */ }); for (const k in allRenderedObjects) delete allRenderedObjects[k]; newlyPlacedObjects = []; }
-        function createAndPlaceObject(objData, isNewObjectForSession) { let obj=null; switch(objData.type){case "Simple House":obj=createSimpleHouse();break; case "Tree":obj=createTree();break; case "Rock":obj=createRock();break; case "Fence Post":obj=createFencePost();break; default: return null;} if(obj){ obj.userData.obj_id = objData.obj_id || obj.userData.obj_id; if(allRenderedObjects[obj.userData.obj_id]){console.warn(`Duplicate obj ID load skipped: ${obj.userData.obj_id}`); return null;} if(objData.position&&objData.position.x!==undefined){obj.position.set(objData.position.x,objData.position.y,objData.position.z);} else if(objData.pos_x!==undefined){obj.position.set(objData.pos_x,objData.pos_y,objData.pos_z);} else {obj.position.set(0,0.5,0);} if(objData.rotation){obj.rotation.set(objData.rotation._x,objData.rotation._y,objData.rotation._z,objData.rotation._order||'XYZ');} else if(objData.rot_x!==undefined){obj.rotation.set(objData.rot_x,objData.rot_y,objData.rot_z,objData.rot_order||'XYZ');} scene.add(obj); allRenderedObjects[obj.userData.obj_id]=obj; if(isNewObjectForSession){newlyPlacedObjects.push(obj);} return obj; } return null; }
-        function saveUnsavedState() { try { const d = newlyPlacedObjects.map(o => ({obj_id:o.userData.obj_id, type:o.userData.type, position:{x:o.position.x,y:o.position.y,z:o.position.z}, rotation:{_x:o.rotation.x,_y:o.rotation.y,_z:o.rotation.z,_order:o.rotation.order}})); sessionStorage.setItem(SESSION_STORAGE_KEY, JSON.stringify(d)); } catch(e) { console.error("Session save error:", e); } }
-        function restoreUnsavedState() { try { const s=sessionStorage.getItem(SESSION_STORAGE_KEY); if(s) { const d=JSON.parse(s); if(Array.isArray(d)) { let c=0; d.forEach(o => { if(createAndPlaceObject(o, true)) c++;}); console.log(`Restored ${c} unsaved objects.`); } } } catch(e) { console.error("Session restore error:", e); sessionStorage.removeItem(SESSION_STORAGE_KEY); } }
-        // --- Object Creation Primitives ---
-        function createObjectBase(type) { return { userData: { type: type, obj_id: THREE.MathUtils.generateUUID() } }; }
-        function createSimpleHouse() { const base = createObjectBase("Simple House"); const group = new THREE.Group(); Object.assign(group, base); const mat1=new THREE.MeshStandardMaterial({color:0xffccaa,roughness:0.8}), mat2=new THREE.MeshStandardMaterial({color:0xaa5533,roughness:0.7}); const m1=new THREE.Mesh(new THREE.BoxGeometry(2,1.5,2.5),mat1); m1.position.y=0.75;m1.castShadow=true;m1.receiveShadow=true;group.add(m1); const m2=new THREE.Mesh(new THREE.ConeGeometry(1.8,1,4),mat2); m2.position.y=1.5+0.5;m2.rotation.y=Math.PI/4;m2.castShadow=true;m2.receiveShadow=true;group.add(m2); return group; }
-        function createTree() { const base=createObjectBase("Tree"); const group=new THREE.Group(); Object.assign(group,base); const mat1=new THREE.MeshStandardMaterial({color:0x8B4513,roughness:0.9}), mat2=new THREE.MeshStandardMaterial({color:0x228B22,roughness:0.8}); const m1=new THREE.Mesh(new THREE.CylinderGeometry(0.3,0.4,2,8),mat1); m1.position.y=1; m1.castShadow=true;m1.receiveShadow=true;group.add(m1); const m2=new THREE.Mesh(new THREE.IcosahedronGeometry(1.2,0),mat2); m2.position.y=2.8; m2.castShadow=true;m2.receiveShadow=true;group.add(m2); return group; }
-        function createRock() { const base=createObjectBase("Rock"); const mat=new THREE.MeshStandardMaterial({color:0xaaaaaa,roughness:0.8,metalness:0.1}); const rock=new THREE.Mesh(new THREE.IcosahedronGeometry(0.7,0),mat); Object.assign(rock,base); rock.position.y=0.35; rock.rotation.set(Math.random()*Math.PI, Math.random()*Math.PI, 0); rock.castShadow=true;rock.receiveShadow=true; return rock; }
-        function createFencePost() { // Continuing from where it cut off
-             const base=createObjectBase("Fence Post");
-             const mat=new THREE.MeshStandardMaterial({color:0xdeb887, roughness:0.9}); // BurlyWood color
-             const post=new THREE.Mesh(new THREE.BoxGeometry(0.2, 1.5, 0.2), mat);
-             Object.assign(post, base); // Add userData to the mesh itself
-             post.position.y= 1.5 / 2; // Position base at y=0
-             post.castShadow=true;
-             post.receiveShadow=true;
-             return post;
-         }
-
-        // --- Event Handlers ---
-        function onMouseMove(event) {
-            // Update mouse vector for raycasting
-            mouse.x = (event.clientX / window.innerWidth) * 2 - 1;
-            mouse.y = -(event.clientY / window.innerHeight) * 2 + 1;
-        }
-
-        function onDocumentClick(event) {
-             if (selectedObjectType === "None") return; // Don't place if 'None' selected
-             // Determine which ground mesh(es) to check for intersection
-             const groundCandidates = Object.values(groundMeshes);
-             if (groundCandidates.length === 0) {
-                 console.warn("No ground exists to place objects on.");
-                 return;
-             }
-
-             raycaster.setFromCamera(mouse, camera);
-             const intersects = raycaster.intersectObjects(groundCandidates); // Check all ground planes
+        // --- setupLighting(), setupInitialGround(), createGroundPlane(), setupPlayer() ---
+        // ... (Keep these functions exactly as in the previous version) ...
+         function setupLighting() { const a=new THREE.AmbientLight(0xffffff,0.5); scene.add(a); const d=new THREE.DirectionalLight(0xffffff,1.0); d.position.set(50,150,100); d.castShadow=true; d.shadow.mapSize.width=4096; d.shadow.mapSize.height=4096; d.shadow.camera.near=0.5; d.shadow.camera.far=500; d.shadow.camera.left=-150; d.shadow.camera.right=150; d.shadow.camera.top=150; d.shadow.camera.bottom=-150; d.shadow.bias=-0.001; scene.add(d); }
+         function setupInitialGround() { plotsMetadata.forEach(p => {createGroundPlane(p.grid_x,p.grid_z,false);}); if(plotsMetadata.length===0) {createGroundPlane(0,0,false);} }
+         function createGroundPlane(gx,gz,isPlaceholder) { const k=`<span class="math-inline">\{gx\}\_</span>{gz}`; if(groundMeshes[k]) return; const geo=new THREE.PlaneGeometry(plotWidth,plotDepth); const mat=isPlaceholder?placeholderGroundMaterial:groundMaterial; const mesh=new THREE.Mesh(geo,mat); mesh.rotation.x=-Math.PI/2; mesh.position.y=-0.05; mesh.position.x=gx*plotWidth+plotWidth/2; mesh.position.z=gz*plotDepth+plotDepth/2; mesh.receiveShadow=true; mesh.userData.gridKey=k; scene.add(mesh); groundMeshes[k]=mesh; if(isPlaceholder){placeholderPlots.add(k);} }
+         function setupPlayer() { const g=new THREE.CapsuleGeometry(0.4,0.8,4,8); const m=new THREE.MeshStandardMaterial({color:0x0000ff,roughness:0.6}); playerMesh=new THREE.Mesh(g,m); playerMesh.position.set(plotWidth/2,0.8,plotDepth/2); playerMesh.castShadow=true; playerMesh.receiveShadow=true; scene.add(playerMesh); }
 
-             if (intersects.length > 0) {
-                 // Found an intersection point on a ground plane
-                 const intersectPoint = intersects[0].point;
-                 let newObjectToPlace = null;
 
-                 // Create the selected object type
-                 switch (selectedObjectType) {
-                    case "Simple House": newObjectToPlace = createSimpleHouse(); break;
-                    case "Tree": newObjectToPlace = createTree(); break;
-                    case "Rock": newObjectToPlace = createRock(); break;
-                    case "Fence Post": newObjectToPlace = createFencePost(); break;
-                    default: console.warn("Attempted to place unknown object type:", selectedObjectType); return;
-                 }
+        // --- loadInitialObjects(), clearAllRenderedObjects(), createAndPlaceObject() ---
+        // ... (Keep these functions exactly as in the previous version - ensuring createAndPlaceObject adds to allRenderedObjects) ...
+         function loadInitialObjects() { console.log(`Loading ${allInitialObjects.length} initial objects.`); clearAllRenderedObjects(); allInitialObjects.forEach(d => { createAndPlaceObject(d, false); }); console.log("Finished initial load."); }
+         function clearAllRenderedObjects() { Object.values(allRenderedObjects).forEach(o => scene.remove(o)); for (const k in allRenderedObjects) delete allRenderedObjects[k]; newlyPlacedObjects = []; /* Important: clear this too when reloading all */ }
+         function createAndPlaceObject(objData, isNewObjectForSession) { let obj=null; switch (objData.type) { case "Simple House": obj=createSimpleHouse(); break; case "Tree": obj=createTree(); break; case "Rock": obj=createRock(); break; case "Fence Post": obj=createFencePost(); break; default: return null; } if (obj) { obj.userData.obj_id = objData.obj_id || obj.userData.obj_id; if (allRenderedObjects[obj.userData.obj_id]) return null; if(objData.position&&objData.position.x!==undefined){obj.position.set(objData.position.x,objData.position.y,objData.position.z);}else if(objData.pos_x!==undefined){obj.position.set(objData.pos_x,objData.pos_y,objData.pos_z);} if(objData.rotation){obj.rotation.set(objData.rotation._x,objData.rotation._y,objData.rotation._z,objData.rotation._order||'XYZ');}else if(objData.rot_x!==undefined){obj.rotation.set(objData.rot_x,objData.rot_y,objData.rot_z,objData.rot_order||'XYZ');} scene.add(obj); allRenderedObjects[obj.userData.obj_id] = obj; if(isNewObjectForSession){newlyPlacedObjects.push(obj);} return obj; } return null; }
 
-                 if (newObjectToPlace) {
-                     // Position the new object at the click point
-                     newObjectToPlace.position.copy(intersectPoint);
-                     // Adjust Y position slightly so it's definitely above the ground plane
-                     newObjectToPlace.position.y = Math.max(0.01, newObjectToPlace.position.y);
+        // --- saveUnsavedState(), restoreUnsavedState(), clearUnsavedSessionState() ---
+        // ... (Keep these sessionStorage functions exactly as in the previous version) ...
+         function saveUnsavedState() { try { const d = newlyPlacedObjects.map(o => ({obj_id:o.userData.obj_id, type:o.userData.type, position:{x:o.position.x,y:o.position.y,z:o.position.z}, rotation:{_x:o.rotation.x,_y:o.rotation.y,_z:o.rotation.z,_order:o.rotation.order}})); sessionStorage.setItem(SESSION_STORAGE_KEY, JSON.stringify(d)); } catch(e) { console.error("Session save error:", e); } }
+         function restoreUnsavedState() { try { const s=sessionStorage.getItem(SESSION_STORAGE_KEY); if(s) { const d=JSON.parse(s); if(Array.isArray(d)) { let c=0; d.forEach(o => { if(createAndPlaceObject(o, true)) c++;}); console.log(`Restored ${c} unsaved objects.`); } } } catch(e) { console.error("Session restore error:", e); sessionStorage.removeItem(SESSION_STORAGE_KEY); } }
+         // function clearUnsavedSessionState() { sessionStorage.removeItem(SESSION_STORAGE_KEY); newlyPlacedObjects = []; console.log("Cleared unsaved session state."); } // Might be useful later
 
-                     scene.add(newObjectToPlace);
-                     // Add to tracked lists
-                     allRenderedObjects[newObjectToPlace.userData.obj_id] = newObjectToPlace;
-                     newlyPlacedObjects.push(newObjectToPlace);
-                     // Save the updated unsaved state to sessionStorage
-                     saveUnsavedState();
-                     console.log(`Placed new ${selectedObjectType}. Total rendered: ${Object.keys(allRenderedObjects).length}, Unsaved in session: ${newlyPlacedObjects.length}`);
-                 }
-             }
-        }
-
-        function onKeyDown(event) { keysPressed[event.code] = true; }
-        function onKeyUp(event) { keysPressed[event.code] = false; }
-
-        // --- Functions called by Python ---
-        function teleportPlayer(targetX, targetZ) {
-            console.log(`JS teleportPlayer called: Target X=${targetX}, Z=${targetZ}`);
-            if (playerMesh) {
-                playerMesh.position.set(targetX, playerMesh.position.y, targetZ); // Set X and Z
-                // Instantly snap camera to new player position
-                const offset = new THREE.Vector3(0, 15, 20); // Camera offset
-                const cameraTargetPosition = playerMesh.position.clone().add(offset);
-                camera.position.copy(cameraTargetPosition);
-                camera.lookAt(playerMesh.position); // Look at player
-                console.log("Player teleported to:", playerMesh.position);
-            } else {
-                console.error("Player mesh not found for teleport.");
-            }
-        }
-
-        function getSaveDataAndPosition() {
-             if (!playerMesh) {
-                 console.error("Player mesh missing, cannot determine save plot.");
-                 return JSON.stringify({ playerPosition: {x:0,y:0,z:0}, objectsToSave: [] });
-             }
-
-             const playerPos = { x: playerMesh.position.x, y: playerMesh.position.y, z: playerMesh.position.z };
-             const currentGridX = Math.floor(playerPos.x / plotWidth);
-             const currentGridZ = Math.floor(playerPos.z / plotDepth);
-             const minX = currentGridX * plotWidth, maxX = minX + plotWidth;
-             const minZ = currentGridZ * plotDepth, maxZ = minZ + plotDepth;
-
-             console.log(`getSaveData: Player in grid [${currentGridX}, ${currentGridZ}]. Filtering objects within X:[${minX.toFixed(1)},${maxX.toFixed(1)}), Z:[${minZ.toFixed(1)},${maxZ.toFixed(1)})`);
-
-             // Filter ALL currently rendered objects to find those within these boundaries
-             const objectsInPlot = Object.values(allRenderedObjects).filter(obj =>
-                  obj.position.x >= minX && obj.position.x < maxX &&
-                  obj.position.z >= minZ && obj.position.z < maxZ
-             ).map(obj => { // Serialize the filtered objects
-                 if (!obj.userData || !obj.userData.type || !obj.userData.obj_id) {
-                      console.warn("Skipping object with missing user data during save serialization:", obj);
-                      return null;
-                 }
-                 const rotation = { _x: obj.rotation.x, _y: obj.rotation.y, _z: obj.rotation.z, _order: obj.rotation.order };
-                 return { // Send WORLD coordinates
-                     obj_id: obj.userData.obj_id, type: obj.userData.type,
-                     position: { x: obj.position.x, y: obj.position.y, z: obj.position.z },
-                     rotation: rotation
-                 };
-             }).filter(obj => obj !== null); // Filter out any nulls from warnings
-
-             const payload = {
-                 playerPosition: playerPos,
-                 objectsToSave: objectsInPlot // Contains all relevant objects for the current plot
-             };
-             console.log(`Prepared payload with ${objectsInPlot.length} objects for saving plot (${currentGridX},${currentGridZ}).`);
-             return JSON.stringify(payload);
-        }
-
-        // --- Animation Loop ---
-        function updatePlayerMovement() {
-            if (!playerMesh) return;
-            const moveDirection = new THREE.Vector3(0, 0, 0);
-            if (keysPressed['KeyW'] || keysPressed['ArrowUp']) moveDirection.z -= 1;
-            if (keysPressed['KeyS'] || keysPressed['ArrowDown']) moveDirection.z += 1;
-            if (keysPressed['KeyA'] || keysPressed['ArrowLeft']) moveDirection.x -= 1;
-            if (keysPressed['KeyD'] || keysPressed['ArrowRight']) moveDirection.x += 1;
-
-            if (moveDirection.lengthSq() > 0) {
-                const forward = new THREE.Vector3(); camera.getWorldDirection(forward); forward.y = 0; forward.normalize();
-                const right = new THREE.Vector3().crossVectors(camera.up, forward).normalize();
-                const worldMove = new THREE.Vector3();
-                worldMove.add(forward.multiplyScalar(-moveDirection.z)); // W/S moves along camera forward/backward
-                worldMove.add(right.multiplyScalar(-moveDirection.x)); // A/D moves along camera right/left
-                worldMove.normalize().multiplyScalar(playerSpeed);
-                playerMesh.position.add(worldMove);
-                playerMesh.position.y = Math.max(0.8, playerMesh.position.y); // Keep player base y near 0.8
-
-                checkAndExpandGround(); // Check if new ground needs to be created visually
-            }
-        }
-
-        function checkAndExpandGround() {
-             if (!playerMesh) return;
-             const currentGridX = Math.floor(playerMesh.position.x / plotWidth);
-             const currentGridZ = Math.floor(playerMesh.position.z / plotDepth);
-
-             // Check immediate neighbors and one step further maybe? Check radius 1 for now.
-             for (let dx = -1; dx <= 1; dx++) {
-                 for (let dz = -1; dz <= 1; dz++) {
-                     // if (dx === 0 && dz === 0) continue; // Also check current cell just in case
-
-                      const checkX = currentGridX + dx;
-                      const checkZ = currentGridZ + dz;
-                      const gridKey = `${checkX}_${checkZ}`;
-
-                      // If no ground mesh exists for this grid cell yet...
-                      if (!groundMeshes[gridKey]) {
-                           // Check if it corresponds to a SAVED plot (metadata from Python)
-                           const isSavedPlot = plotsMetadata.some(plot => plot.grid_x === checkX && plot.grid_z === checkZ);
-                           // If it's NOT a saved plot, create a visual placeholder
-                           if (!isSavedPlot) {
-                                createGroundPlane(checkX, checkZ, true); // true = is placeholder
-                           }
-                           // If it IS a saved plot but the mesh is missing (e.g. after clear), recreate it
-                           // This shouldn't happen often with current logic but adds robustness
-                           else {
-                                createGroundPlane(checkX, checkZ, false);
-                           }
-                      }
-                 }
-            }
-        }
-
-        function updateCamera() {
-            if (!playerMesh) return;
-            const offset = new THREE.Vector3(0, 15, 20); // Fixed third-person offset
-            const targetPosition = playerMesh.position.clone().add(offset);
-            // Smoothly interpolate camera position
-            camera.position.lerp(targetPosition, 0.08);
-            // Always look at the player's current position
-            camera.lookAt(playerMesh.position);
-        }
-
-        function onWindowResize() {
-            camera.aspect = window.innerWidth / window.innerHeight;
-            camera.updateProjectionMatrix();
-            renderer.setSize(window.innerWidth, window.innerHeight);
-        }
-
-        function animate() {
-            requestAnimationFrame(animate);
-            updatePlayerMovement(); // Includes ground expansion check
-            updateCamera();
-            renderer.render(scene, camera);
-        }
-
-        // --- Start the application ---
-        init();
-
-    </script>
-</body>
-</html>
+        // --- Object Creation Functions ---
+        // ... (Keep these exactly as before, ensuring they assign userData.type and userData.obj_id) ...
+        function createObjectBase(type) { return { userData: { type: type, obj_id: THREE.MathUtils.generateUUID() } }; }
+        function createSimpleHouse() { const base = createObjectBase("Simple House"); const group = new THREE.Group(); Object.assign(group, base); const mat1=new THREE.MeshStandardMaterial({color:0xffccaa,roughness:0.8}), mat2=new THREE.MeshStandardMaterial({color:0xaa5533,roughness:0.7}); const m1=new THREE.Mesh(new THREE.BoxGeometry(2,1.5,2.5),mat1); m1.position.y=0.75;m1.castShadow=true;m1.receiveShadow=true;group.add(m1); const m2=new THREE.Mesh(new THREE.ConeGeometry(1.8,1,4),mat2); m2.position.y=1.5+0.5;m2.rotation.y=Math.PI/4;m2.castShadow=true;m2.receiveShadow=true;group.add(m2); return group; }
+        function createTree() { const base=createObjectBase("Tree"); const group=new THREE.Group(); Object.assign(group,base); const mat1=new THREE.MeshStandardMaterial({color:0x8B4513,roughness:0.9}), mat2=new THREE.MeshStandardMaterial({color:0x228B22,roughness:0.8}); const m1=new THREE.Mesh(new THREE.CylinderGeometry(0.3,0.4,2,8),mat1); m1.position.y=1; m1.castShadow=true;m1.receiveShadow=true;group.add(m1); const m2=