Update js_scripts/index.js

js_scripts/index.js

@@ -1,36 +1,6 @@
-// Store the current script reference before the async function runs
-const currentScriptTag = document.currentScript;
-
 (async function() {
-  // Import PlayCanvas
-  const pc = await import("https://cdn.skypack.dev/[email protected]");
-  window.pc = pc;
-  
-  // Find the script tag using a more reliable method
-  let scriptTag = currentScriptTag;
-  
-  // Fallback method if currentScriptTag is null
-  if (!scriptTag) {
-    const scripts = document.getElementsByTagName('script');
-    for (let i = 0; i < scripts.length; i++) {
-      if (scripts[i].src.includes('index.js') && scripts[i].hasAttribute('data-config')) {
-        scriptTag = scripts[i];
-        break;
-      }
-    }
-    
-    // If still not found, try the last script on the page
-    if (!scriptTag && scripts.length > 0) {
-      scriptTag = scripts[scripts.length - 1];
-    }
-  }
-  
-  // Check if we found a script tag
-  if (!scriptTag) {
-    console.error("Could not find the script tag with data-config attribute.");
-    return;
-  }
-  
+  // Retrieve the current script tag and load the JSON configuration file from the data-config attribute.
+  const scriptTag = document.currentScript;
   const configUrl = scriptTag.getAttribute("data-config");
   let config = {};
   if (configUrl) {
@@ -54,14 +24,9 @@ const currentScriptTag = document.currentScript;
     document.head.appendChild(linkEl);
   }
 
-  // --- Outer scope variables ---
-  let cameraEntity = null;
-  let app = null;
-  let modelEntity = null;
-  let viewerInitialized = false;
-  let wheelHandlers = [];
-  let resizeHandler = null;
-  let progressChecker = null;
+  // --- Outer scope variables for viewer state ---
+  let SPLAT = null;
+  let viewerActive = false;
   
   // Generate a unique identifier for this widget instance.
   const instanceId = Math.random().toString(36).substr(2, 8);
@@ -69,45 +34,31 @@ const currentScriptTag = document.currentScript;
   // Read configuration values from the JSON file.
   const gifUrl = config.gif_url;
   const plyUrl = config.ply_url;
-  
-  // Camera constraint parameters
-  const minZoom = parseFloat(config.minZoom || "1");
+  const minZoom = parseFloat(config.minZoom || "0");
   const maxZoom = parseFloat(config.maxZoom || "20");
-  const minAngle = parseFloat(config.minAngle || "-45");
-  const maxAngle = parseFloat(config.maxAngle || "90");
-  const minAzimuth = config.minAzimuth !== undefined ? parseFloat(config.minAzimuth) : -360;
-  const maxAzimuth = config.maxAzimuth !== undefined ? parseFloat(config.maxAzimuth) : 360;
-  
-  // Model position, scale, and rotation parameters
-  const modelX = config.modelX !== undefined ? parseFloat(config.modelX) : 0;
-  const modelY = config.modelY !== undefined ? parseFloat(config.modelY) : 0;
-  const modelZ = config.modelZ !== undefined ? parseFloat(config.modelZ) : 0;
-  
-  const modelScale = config.modelScale !== undefined ? parseFloat(config.modelScale) : 1;
-  
-  const modelRotationX = config.modelRotationX !== undefined ? parseFloat(config.modelRotationX) : 0;
-  const modelRotationY = config.modelRotationY !== undefined ? parseFloat(config.modelRotationY) : 0;
-  const modelRotationZ = config.modelRotationZ !== undefined ? parseFloat(config.modelRotationZ) : 0;
-  
-  // Direct camera coordinates
-  const cameraX = config.cameraX !== undefined ? parseFloat(config.cameraX) : 0;
-  const cameraY = config.cameraY !== undefined ? parseFloat(config.cameraY) : 2;
-  const cameraZ = config.cameraZ !== undefined ? parseFloat(config.cameraZ) : 5;
-  
-  // Camera coordinates for mobile devices
-  const cameraXPhone = config.cameraXPhone !== undefined ? parseFloat(config.cameraXPhone) : cameraX;
-  const cameraYPhone = config.cameraYPhone !== undefined ? parseFloat(config.cameraYPhone) : cameraY;
-  const cameraZPhone = config.cameraZPhone !== undefined ? parseFloat(config.cameraZPhone) : cameraZ * 1.5;
+  const minAngle = parseFloat(config.minAngle || "0");
+  const maxAngle = parseFloat(config.maxAngle || "360");
+  const minAzimuth = config.minAzimuth !== undefined ? parseFloat(config.minAzimuth) : -Infinity;
+  const maxAzimuth = config.maxAzimuth !== undefined ? parseFloat(config.maxAzimuth) : Infinity;
+  
+  // Read initial orbit parameters for desktop.
+  const initAlphaDesktop = config.initAlpha !== undefined ? parseFloat(config.initAlpha) : 0.5;
+  const initBetaDesktop  = config.initBeta  !== undefined ? parseFloat(config.initBeta)  : 0.5;
+  const initRadiusDesktop = config.initRadius !== undefined ? parseFloat(config.initRadius) : 5;
+  // Read initial orbit parameters for phone.
+  const initAlphaPhone = config.initAlphaPhone !== undefined ? parseFloat(config.initAlphaPhone) : initAlphaDesktop;
+  const initBetaPhone  = config.initBetaPhone  !== undefined ? parseFloat(config.initBetaPhone)  : initBetaDesktop;
+  const initRadiusPhone = config.initRadiusPhone !== undefined ? parseFloat(config.initRadiusPhone) : initRadiusDesktop;
 
   // Detect if the device is iOS.
   const isIOS = /iPad|iPhone|iPod/.test(navigator.userAgent) && !window.MSStream;
   // Also detect Android devices.
   const isMobile = isIOS || /Android/i.test(navigator.userAgent);
   
-  // Choose the appropriate coordinates based on device type
-  const chosenCameraX = isMobile ? cameraXPhone : cameraX;
-  const chosenCameraY = isMobile ? cameraYPhone : cameraY;
-  const chosenCameraZ = isMobile ? cameraZPhone : cameraZ;
+  // Choose the appropriate initial orbit values based on device type.
+  const chosenInitAlpha = isMobile ? initAlphaPhone : initAlphaDesktop;
+  const chosenInitBeta  = isMobile ? initBetaPhone  : initBetaDesktop;
+  const chosenInitRadius = isMobile ? initRadiusPhone : initRadiusDesktop;
   
   // Determine the aspect ratio.
   let aspectPercent = "100%";
@@ -181,18 +132,6 @@ const currentScriptTag = document.currentScript;
   const progressDialog = document.getElementById('progress-dialog-' + instanceId);
   const progressIndicator = document.getElementById('progress-indicator-' + instanceId);
   
-  // Flag to track if mouse is over the viewer
-  let isMouseOverViewer = false;
-  
-  // Add mouse hover tracking for the viewer container
-  viewerContainer.addEventListener('mouseenter', function() {
-    isMouseOverViewer = true;
-  });
-  
-  viewerContainer.addEventListener('mouseleave', function() {
-    isMouseOverViewer = false;
-  });
-  
   // Set help instructions based on device type.
   if (isMobile) {
     menuContent.innerHTML = `
@@ -208,7 +147,9 @@ const currentScriptTag = document.currentScript;
     `;
   }
   
-  // Handle GIF configuration
+  // If a gif_url is provided, set the preview image.
+  // Otherwise, hide the preview container, show the viewer immediately,
+  // and hide the "close" button since there's no preview to return to.
   if (gifUrl) {
     previewImage.src = gifUrl;
     gifPreview.style.display = 'block';
@@ -217,83 +158,22 @@ const currentScriptTag = document.currentScript;
     gifPreview.style.display = 'none';
     viewerContainer.style.display = 'block';
     closeBtn.style.display = 'none';
-    // Initialize the viewer only when needed
+    // Need to load the PLY without a GIF preview
     setTimeout(() => {
-      initializeViewer();
+      loadAndStartViewer();
     }, 100);
   }
   
   // --- Button Event Handlers ---
   if (gifUrl) {
-    // Add click event to the GIF container
     gifPreview.addEventListener('click', function() {
       console.log("GIF preview clicked, showing 3D viewer");
       gifPreview.style.display = 'none';
       viewerContainer.style.display = 'block';
-      
-      // Make sure we're not initializing again if already done
-      if (!viewerInitialized) {
-        initializeViewer();
-      }
+      loadAndStartViewer();
     });
   }
   
-  // Function to clean up the viewer completely
-  function cleanupViewer() {
-    console.log("Starting viewer cleanup...");
-    
-    // Clear any running intervals
-    if (progressChecker) {
-      clearInterval(progressChecker);
-      progressChecker = null;
-    }
-    
-    // Remove wheel event listeners
-    for (const handler of wheelHandlers) {
-      const [element, func] = handler;
-      element.removeEventListener('wheel', func, { passive: false });
-    }
-    wheelHandlers = [];
-    
-    // Remove resize handler if it exists
-    if (resizeHandler) {
-      window.removeEventListener('resize', resizeHandler);
-      resizeHandler = null;
-    }
-    
-    // Reset the canvas context
-    if (canvas) {
-      const ctx = canvas.getContext('webgl2') || canvas.getContext('webgl');
-      if (ctx && ctx.getExtension('WEBGL_lose_context')) {
-        try {
-          ctx.getExtension('WEBGL_lose_context').loseContext();
-        } catch (e) {
-          console.error("Error releasing WebGL context:", e);
-        }
-      }
-    }
-    
-    // Destroy PlayCanvas app if it exists
-    if (app) {
-      try {
-        app.destroy();
-      } catch (e) {
-        console.error("Error destroying PlayCanvas app:", e);
-      }
-      app = null;
-    }
-    
-    // Reset entities
-    cameraEntity = null;
-    modelEntity = null;
-    
-    // Mark the viewer as not initialized
-    viewerInitialized = false;
-    
-    console.log("Viewer cleanup complete");
-  }
-  
-  // Close button event handler
   closeBtn.addEventListener('click', function() {
     console.log("Close button clicked");
     
@@ -308,22 +188,20 @@ const currentScriptTag = document.currentScript;
       fullscreenToggle.textContent = '⇱';
     }
     
-    // Clean up the viewer
-    cleanupViewer();
+    // Stop the viewer
+    stopViewer();
     
-    // Hide viewer and show GIF
+    // Show GIF and hide viewer
     viewerContainer.style.display = 'none';
     gifPreview.style.display = 'block';
   });
   
-  // Fullscreen toggle handler
   fullscreenToggle.addEventListener('click', function() {
     if (isIOS) {
       if (!widgetContainer.classList.contains('fake-fullscreen')) {
         widgetContainer.classList.add('fake-fullscreen');
       } else {
         widgetContainer.classList.remove('fake-fullscreen');
-        resetCamera();
       }
       fullscreenToggle.textContent = widgetContainer.classList.contains('fake-fullscreen') ? '⇲' : '⇱';
     } else {
@@ -351,102 +229,25 @@ const currentScriptTag = document.currentScript;
       fullscreenToggle.textContent = '⇲';
       widgetContainer.style.height = '100%';
       widgetContainer.style.paddingBottom = '0';
-      resetCamera();
     } else {
       fullscreenToggle.textContent = '⇱';
       widgetContainer.style.height = '0';
       widgetContainer.style.paddingBottom = aspectPercent;
-      resetCamera();
     }
   });
   
-  // Help toggle button
   helpToggle.addEventListener('click', function(e) {
     e.stopPropagation();
     menuContent.style.display = (menuContent.style.display === 'block') ? 'none' : 'block';
   });
   
-  // --- Camera Reset Function ---
-  function resetCamera() {
-    if (!cameraEntity || !modelEntity || !app) {
-      console.log("Cannot reset camera - missing entities or app");
-      return;
-    }
-    
-    try {
-      // Get the orbit camera script
-      const orbitCam = cameraEntity.script.orbitCamera;
-      if (!orbitCam) {
-        console.log("Cannot reset camera - missing orbit camera script");
-        return;
-      }
-      
-      // Store model position
-      const modelPos = modelEntity.getPosition();
-      
-      // 1. Create a temporary entity to help calculate new values
-      const tempEntity = new pc.Entity();
-      tempEntity.setPosition(chosenCameraX, chosenCameraY, chosenCameraZ);
-      tempEntity.lookAt(modelPos);
-      
-      // 2. Calculate the distance between camera and model
-      const distance = new pc.Vec3().sub2(
-        new pc.Vec3(chosenCameraX, chosenCameraY, chosenCameraZ),
-        modelPos
-      ).length();
-      
-      // 3. Set camera position
-      cameraEntity.setPosition(chosenCameraX, chosenCameraY, chosenCameraZ);
-      cameraEntity.lookAt(modelPos);
-      
-      // 4. Update the orbit camera's pivot point
-      orbitCam.pivotPoint = new pc.Vec3(modelPos.x, modelPos.y, modelPos.z);
-      
-      // 5. Set the distance
-      orbitCam._targetDistance = distance;
-      orbitCam._distance = distance;
-      
-      // 6. Calculate and set yaw and pitch from the camera's rotation
-      const rotation = tempEntity.getRotation();
-      const tempForward = new pc.Vec3();
-      rotation.transformVector(pc.Vec3.FORWARD, tempForward);
-      
-      const yaw = Math.atan2(-tempForward.x, -tempForward.z) * pc.math.RAD_TO_DEG;
-      
-      const yawQuat = new pc.Quat().setFromEulerAngles(0, -yaw, 0);
-      const rotWithoutYaw = new pc.Quat().mul2(yawQuat, rotation);
-      const forwardWithoutYaw = new pc.Vec3();
-      rotWithoutYaw.transformVector(pc.Vec3.FORWARD, forwardWithoutYaw);
-      const pitch = Math.atan2(forwardWithoutYaw.y, -forwardWithoutYaw.z) * pc.math.RAD_TO_DEG;
-      
-      // Set yaw and pitch directly on internal variables
-      orbitCam._targetYaw = yaw;
-      orbitCam._yaw = yaw;
-      orbitCam._targetPitch = pitch;
-      orbitCam._pitch = pitch;
-      
-      // Force update
-      if (typeof orbitCam._updatePosition === 'function') {
-        orbitCam._updatePosition();
-      }
-      
-      // Clean up
-      tempEntity.destroy();
-      
-      console.log("Camera reset complete");
-      
-    } catch (error) {
-      console.error("Error resetting camera:", error);
-    }
-  }
-  
-  // Reset camera button event handler
   resetCameraBtn.addEventListener('click', function() {
-    console.log("Reset camera button clicked");
-    resetCamera();
+    console.log("Reset camera button clicked.");
+    if (window.viewer && typeof window.viewer.resetCamera === 'function') {
+      window.viewer.resetCamera();
+    }
   });
   
-  // Escape key handler for fullscreen exit
   document.addEventListener('keydown', function(e) {
     if (e.key === 'Escape' || e.key === 'Esc') {
       let wasFullscreen = false;
@@ -461,64 +262,14 @@ const currentScriptTag = document.currentScript;
         widgetContainer.classList.remove('fake-fullscreen');
         fullscreenToggle.textContent = '⇱';
       }
-      if (wasFullscreen) {
-        resetCamera();
-      }
     }
   });
   
-  // --- Prevent app from hijacking all wheel events ---
-  function setupWheelHandlers() {
-    // First remove any existing handlers
-    for (const handler of wheelHandlers) {
-      const [element, func] = handler;
-      element.removeEventListener('wheel', func, { passive: false });
-    }
-    wheelHandlers = [];
-    
-    // Create new wheel handler
-    const handleWheel = function(event) {
-      // Check if mouse is over the viewer
-      if (!isMouseOverViewer) {
-        // Allow normal page scrolling
-        return true;
-      }
-      
-      // Otherwise apply zooming, but prevent default only for viewer area
-      event.stopPropagation();
-      
-      if (cameraEntity && cameraEntity.script && cameraEntity.script.orbitCamera) {
-        const camera = cameraEntity.camera;
-        const orbitCamera = cameraEntity.script.orbitCamera;
-        const sensitivity = cameraEntity.script.orbitCameraInputMouse ? 
-                            cameraEntity.script.orbitCameraInputMouse.distanceSensitivity || 0.4 : 0.4;
-        
-        if (camera.projection === pc.PROJECTION_PERSPECTIVE) {
-          orbitCamera.distance -= event.deltaY * 0.01 * sensitivity * (orbitCamera.distance * 0.1);
-        } else {
-          orbitCamera.orthoHeight -= event.deltaY * 0.01 * sensitivity * (orbitCamera.orthoHeight * 0.1);
-        }
-        
-        event.preventDefault();
-      }
-    };
-    
-    // Add wheel handlers and store references for cleanup
-    viewerContainer.addEventListener('wheel', handleWheel, { passive: false });
-    canvas.addEventListener('wheel', handleWheel, { passive: false });
-    
-    // Store handlers for later cleanup
-    wheelHandlers.push([viewerContainer, handleWheel]);
-    wheelHandlers.push([canvas, handleWheel]);
-    
-    console.log("Wheel handlers set up");
-  }
-  
-  // --- Initialize the 3D PLY Viewer using PlayCanvas ---
-  async function initializeViewer() {
-    // Skip initialization if already initialized
-    if (viewerInitialized || app) {
-      console.log("Viewer already initialized or app exists, skipping initialization");
+  // --- Load SPLAT Library and Initialize the 3D PLY Viewer ---
+  async function loadAndStartViewer() {
+    // Don't reinitialize if already active
+    if (viewerActive) {
+      console.log("Viewer already active, skipping initialization");
       return;
     }
     
@@ -526,232 +277,260 @@ const currentScriptTag = document.currentScript;
     progressDialog.style.display = 'block';
     progressIndicator.value = 0;
     
-    // Initialize PlayCanvas
-    const deviceType = "webgl2";
-    const gfxOptions = {
-      deviceTypes: [deviceType],
-      glslangUrl: `https://playcanvas.vercel.app/static/lib/glslang/glslang.js`,
-      twgslUrl: `https://playcanvas.vercel.app/static/lib/twgsl/twgsl.js`,
-      antialias: false
-    };
-    
     try {
-      // Create graphics device
-      const device = await pc.createGraphicsDevice(canvas, gfxOptions);
-      device.maxPixelRatio = Math.min(window.devicePixelRatio, 2);
-      
-      // Create app
-      const createOptions = new pc.AppOptions();
-      createOptions.graphicsDevice = device;
-      createOptions.mouse = new pc.Mouse(canvas);
-      createOptions.touch = new pc.TouchDevice(canvas);
-      createOptions.componentSystems = [
-        pc.RenderComponentSystem,
-        pc.CameraComponentSystem,
-        pc.LightComponentSystem,
-        pc.ScriptComponentSystem,
-        pc.GSplatComponentSystem
-      ];
-      createOptions.resourceHandlers = [
-        pc.TextureHandler,
-        pc.ContainerHandler,
-        pc.ScriptHandler,
-        pc.GSplatHandler
-      ];
-      
-      app = new pc.AppBase(canvas);
-      app.init(createOptions);
-      
-      // Set canvas fill mode to match the container
-      app.setCanvasFillMode(pc.FILLMODE_NONE);
-      app.setCanvasResolution(pc.RESOLUTION_AUTO);
-      
-      // Set scene options
-      app.scene.exposure = 0.8;
-      app.scene.toneMapping = pc.TONEMAP_ACES;
-      
-      // Handle window resizing
-      const resize = () => {
-        if (app) {
-          app.resizeCanvas(canvas.clientWidth, canvas.clientHeight);
-        }
-      };
-      
-      // Store resize handler for cleanup
-      resizeHandler = resize;
-      window.addEventListener('resize', resizeHandler);
-      
-      // Add cleanup when app is destroyed
-      app.on('destroy', () => {
-        if (resizeHandler) {
-          window.removeEventListener('resize', resizeHandler);
-          resizeHandler = null;
-        }
-        if (progressChecker) {
-          clearInterval(progressChecker);
-          progressChecker = null;
-        }
-      });
-      
-      // Load required assets
-      const assets = {
-        model: new pc.Asset('gsplat', 'gsplat', { url: plyUrl }),
-        orbit: new pc.Asset('script', 'script', { url: `https://bilca-visionneur-play-canva-2.static.hf.space/orbit-camera.js` })
-      };
-      
-      // Create asset loader with progress tracking
-      const assetListLoader = new pc.AssetListLoader(Object.values(assets), app.assets);
-      
-      // Handle asset loading progress
-      let lastProgress = 0;
-      assets.model.on('load', (asset) => {
-        progressDialog.style.display = 'none';
-        console.log("Model loaded successfully");
-      });
-      
-      assets.model.on('error', (err) => {
-        console.error("Error loading PLY file:", err);
-        progressDialog.innerHTML = `<p style="color: red">Error loading model: ${err}</p>`;
-        viewerInitialized = false;
-      });
-      
-      // Set up progress monitoring
-      const checkProgress = () => {
-        if (!app) {
-          clearInterval(progressChecker);
-          progressChecker = null;
-          return;
-        }
-        
-        if (app && assets.model.resource) {
-          progressIndicator.value = 100;
-          clearInterval(progressChecker);
-          progressChecker = null;
-          progressDialog.style.display = 'none';
-        } else if (assets.model.loading) {
-          // Increment progress for visual feedback
-          lastProgress += 2;
-          if (lastProgress > 90) lastProgress = 90; // Cap at 90% until fully loaded
-          progressIndicator.value = lastProgress;
-        }
-      };
-      
-      progressChecker = setInterval(checkProgress, 100);
+      // Only load the SPLAT library once
+      if (!SPLAT) {
+        SPLAT = await import("https://bilca-gsplat-library.static.hf.space/dist/index.js");
+      }
       
-      // Load assets and set up scene
-      assetListLoader.load(() => {
-        if (!app) {
-          console.log("App was destroyed during asset loading");
-          return;
-        }
-        
-        app.start();
-        
-        // Create model entity
-        modelEntity = new pc.Entity('model');
-        modelEntity.addComponent('gsplat', {
-          asset: assets.model
-        });
-        
-        // Position the model using JSON parameters
-        modelEntity.setLocalPosition(modelX, modelY, modelZ);
-        modelEntity.setLocalEulerAngles(modelRotationX, modelRotationY, modelRotationZ);
-        modelEntity.setLocalScale(modelScale, modelScale, modelScale);
-        
-        app.root.addChild(modelEntity);
-        
-        // Create camera entity
-        cameraEntity = new pc.Entity('camera');
-        cameraEntity.addComponent('camera', {
-          clearColor: new pc.Color(
-            config.canvas_background ? parseInt(config.canvas_background.substr(1, 2), 16) / 255 : 0,
-            config.canvas_background ? parseInt(config.canvas_background.substr(3, 2), 16) / 255 : 0,
-            config.canvas_background ? parseInt(config.canvas_background.substr(5, 2), 16) / 255 : 0
-          ),
-          toneMapping: pc.TONEMAP_ACES
-        });
-        
-        // Set camera position directly using X, Y, Z coordinates from config
-        cameraEntity.setPosition(chosenCameraX, chosenCameraY, chosenCameraZ);
-        cameraEntity.lookAt(modelEntity.getPosition());
+      // Create a fresh viewer instance
+      window.viewer = {
+        // Properties
+        renderer: null,
+        scene: null,
+        camera: null,
+        controls: null,
+        animFrameId: null,
+        resizeObserver: null,
+        initialCameraPosition: null,
+        initialCameraRotation: null,
         
-        // Add orbit camera script for interactive navigation
-        cameraEntity.addComponent('script');
-        cameraEntity.script.create('orbitCamera', {
-          attributes: {
-            inertiaFactor: 0.2,
-            focusEntity: modelEntity,
-            distanceMax: maxZoom,
-            distanceMin: minZoom,
-            pitchAngleMax: maxAngle,
-            pitchAngleMin: minAngle,
-            yawAngleMax: maxAzimuth,
-            yawAngleMin: minAzimuth,
-            frameOnStart: false // Don't auto-frame since we're setting position directly
+        // Initialize the viewer
+        async init() {
+          // Create renderer and scene
+          this.renderer = new SPLAT.WebGLRenderer(canvas);
+          this.scene = new SPLAT.Scene();
+          
+          // Create camera
+          this.camera = new SPLAT.Camera();
+          
+          // Store initial camera state
+          this.initialCameraPosition = this.camera.position.clone();
+          this.initialCameraRotation = this.camera.rotation.clone();
+          
+          // Create controls
+          this.controls = new SPLAT.OrbitControls(
+            this.camera,
+            canvas,
+            0.5,
+            0.5,
+            5,
+            true,
+            new SPLAT.Vector3(),
+            chosenInitAlpha,
+            chosenInitBeta,
+            chosenInitRadius
+          );
+          
+          // Set control constraints
+          this.controls.maxZoom = maxZoom;
+          this.controls.minZoom = minZoom;
+          this.controls.minAngle = minAngle;
+          this.controls.maxAngle = maxAngle;
+          this.controls.minAzimuth = minAzimuth;
+          this.controls.maxAzimuth = maxAzimuth;
+          this.controls.panSpeed = isMobile ? 0.5 : 1.2;
+          
+          // Set canvas background
+          canvas.style.background = config.canvas_background || "#FEFEFD";
+          
+          // Handle resize
+          this.handleResize();
+          
+          // Set up resize observer
+          this.resizeObserver = new ResizeObserver(() => {
+            this.handleResize();
+          });
+          this.resizeObserver.observe(canvas);
+          
+          // Update controls
+          this.controls.update();
+          
+          // Load the PLY file
+          try {
+            await SPLAT.PLYLoader.LoadAsync(
+              plyUrl,
+              this.scene,
+              (progress) => {
+                progressIndicator.value = progress * 100;
+              }
+            );
+            progressDialog.style.display = 'none';
+          } catch (error) {
+            console.error("Error loading PLY file:", error);
+            progressDialog.innerHTML = `<p style="color: red">Error loading model: ${error.message}</p>`;
+            return false;
           }
-        });
+          
+          // Start rendering
+          this.startRenderLoop();
+          return true;
+        },
         
-        // Create input controllers but don't add mouse wheel handling - we handle that separately
-        cameraEntity.script.create('orbitCameraInputMouse', {
-          attributes: {
-            orbitSensitivity: isMobile ? 0.6 : 0.3,
-            distanceSensitivity: isMobile ? 0.5 : 0.4
+        // Handle resize
+        handleResize() {
+          if (this.renderer) {
+            this.renderer.setSize(canvas.clientWidth, canvas.clientHeight);
           }
-        });
+        },
         
-        // Disable wheel event in the orbit camera input
-        if (cameraEntity.script.orbitCameraInputMouse) {
-          // Override mouse wheel to do nothing - we handle wheel events separately
-          cameraEntity.script.orbitCameraInputMouse.onMouseWheel = function() {};
-        }
+        // Start the render loop
+        startRenderLoop() {
+          // Animation frame loop
+          const renderFrame = () => {
+            if (this.controls && this.scene && this.camera && this.renderer) {
+              this.controls.update();
+              this.renderer.render(this.scene, this.camera);
+              this.animFrameId = requestAnimationFrame(renderFrame);
+            }
+          };
+          
+          this.animFrameId = requestAnimationFrame(renderFrame);
+        },
         
-        // Add touch input controller
-        cameraEntity.script.create('orbitCameraInputTouch', {
-          attributes: {
-            orbitSensitivity: 0.6,
-            distanceSensitivity: 0.5
+        // Reset camera to initial position
+        resetCamera() {
+          if (!this.camera || !this.initialCameraPosition || !this.initialCameraRotation) {
+            console.log("Cannot reset camera - missing camera instance or initial positions");
+            return;
           }
-        });
-        
-        // Initialize the orbit controller
-        setTimeout(() => {
-          if (cameraEntity && cameraEntity.script && cameraEntity.script.orbitCamera) {
-            // Calculate distance from camera to model
-            const modelPos = modelEntity.getPosition();
-            const camPos = cameraEntity.getPosition();
-            const distanceVec = new pc.Vec3();
-            distanceVec.sub2(camPos, modelPos);
-            const distance = distanceVec.length();
+          
+          try {
+            // Dispose previous controls if they exist
+            if (this.controls && typeof this.controls.dispose === 'function') {
+              this.controls.dispose();
+            }
+            
+            // Set camera back to initial position
+            this.camera.position = this.initialCameraPosition.clone();
+            this.camera.rotation = this.initialCameraRotation.clone();
+            
+            // Create new controls
+            this.controls = new SPLAT.OrbitControls(
+              this.camera,
+              canvas,
+              0.5,
+              0.5,
+              5,
+              true,
+              new SPLAT.Vector3(),
+              chosenInitAlpha,
+              chosenInitBeta,
+              chosenInitRadius
+            );
+            
+            // Set control constraints
+            this.controls.maxZoom = maxZoom;
+            this.controls.minZoom = minZoom;
+            this.controls.minAngle = minAngle;
+            this.controls.maxAngle = maxAngle;
+            this.controls.minAzimuth = minAzimuth;
+            this.controls.maxAzimuth = maxAzimuth;
+            this.controls.panSpeed = isMobile ? 0.5 : 1.2;
             
-            // Set up the orbit controller
-            cameraEntity.script.orbitCamera.pivotPoint.copy(modelPos);
-            cameraEntity.script.orbitCamera.distance = distance;
-            cameraEntity.script.orbitCamera._removeInertia();
+            // Update controls
+            this.controls.update();
+            
+            console.log("Camera reset successful");
+          } catch (error) {
+            console.error("Error resetting camera:", error);
           }
-        }, 100);
-        
-        app.root.addChild(cameraEntity);
-        
-        // Initial resize to match container
-        resize();
-        
-        // Set up wheel handlers
-        setupWheelHandlers();
-        
-        // Hide progress dialog when everything is set up
-        progressDialog.style.display = 'none';
+        },
         
-        // Mark viewer as initialized
-        viewerInitialized = true;
-        
-        console.log("PLY viewer initialization complete");
-      });
+        // Clean up resources
+        dispose() {
+          // Cancel animation frame
+          if (this.animFrameId) {
+            cancelAnimationFrame(this.animFrameId);
+            this.animFrameId = null;
+          }
+          
+          // Remove resize observer
+          if (this.resizeObserver) {
+            this.resizeObserver.disconnect();
+            this.resizeObserver = null;
+          }
+          
+          // Dispose controls
+          if (this.controls && typeof this.controls.dispose === 'function') {
+            try {
+              this.controls.dispose();
+            } catch (e) {
+              console.warn("Error disposing controls:", e);
+            }
+            this.controls = null;
+          }
+          
+          // Dispose renderer
+          if (this.renderer && typeof this.renderer.dispose === 'function') {
+            try {
+              this.renderer.dispose();
+            } catch (e) {
+              console.warn("Error disposing renderer:", e);
+            }
+            this.renderer = null;
+          }
+          
+          // Clear scene
+          if (this.scene) {
+            this.scene = null;
+          }
+          
+          // Clear camera
+          this.camera = null;
+          this.initialCameraPosition = null;
+          this.initialCameraRotation = null;
+          
+          console.log("Viewer resources disposed");
+        }
+      };
+      
+      // Initialize the viewer
+      const success = await window.viewer.init();
+      if (success) {
+        viewerActive = true;
+        console.log("PLY viewer started successfully");
+      } else {
+        viewerActive = false;
+        console.error("Failed to initialize PLY viewer");
+      }
       
     } catch (error) {
-      console.error("Error initializing PlayCanvas viewer:", error);
-      progressDialog.innerHTML = `<p style="color: red">Error loading viewer: ${error.message}</p>`;
-      viewerInitialized = false;
-      app = null;
+      console.error("Error in loadAndStartViewer:", error);
+      progressDialog.innerHTML = `<p style="color: red">Error initializing viewer: ${error.message}</p>`;
+      viewerActive = false;
+    }
+  }
+  
+  // Stop the viewer and clean up resources
+  function stopViewer() {
+    if (!viewerActive) {
+      console.log("Viewer not active, nothing to stop");
+      return;
     }
+    
+    console.log("Stopping viewer...");
+    
+    // Dispose viewer resources
+    if (window.viewer && typeof window.viewer.dispose === 'function') {
+      window.viewer.dispose();
+    }
+    
+    // Reset WebGL context if possible
+    if (canvas) {
+      const ctx = canvas.getContext('webgl') || canvas.getContext('webgl2');
+      if (ctx && ctx.getExtension('WEBGL_lose_context')) {
+        try {
+          ctx.getExtension('WEBGL_lose_context').loseContext();
+        } catch (e) {
+          console.warn("Error releasing WebGL context:", e);
+        }
+      }
+    }
+    
+    // Mark viewer as not active
+    viewerActive = false;
+    
+    console.log("Viewer stopped");
   }
 })();