Update viewer.js

viewer.js

@@ -1,6 +1,4 @@
-// viewer.js
-// ==============================
-
+let pc;
 export let app = null;
 let cameraEntity = null;
 let modelEntity = null;
@@ -12,289 +10,359 @@ let minZoom, maxZoom, minAngle, maxAngle, minAzimuth, maxAzimuth, minPivotY, min
 let modelX, modelY, modelZ, modelScale, modelRotationX, modelRotationY, modelRotationZ;
 let sogsUrl, glbUrl, canvasBg;
 
-function getDeviceTypes() {
-    const ua = navigator.userAgent;
-    if (/iPad|iPhone|iPod/.test(ua) || (ua.includes("Macintosh") && "ontouchend" in document)) {
-        return ['webgl2', 'webgl1']; // Try both on iOS
-    }
-    return ['webgl2', 'webgl1'];
+function hexToRgbaArray(hex) {
+  try {
+    hex = hex.replace("#", "");
+    if (hex.length === 6) hex += "FF";
+    if (hex.length !== 8) return [1, 1, 1, 1];
+    const num = parseInt(hex, 16);
+    return [
+      ((num >> 24) & 0xFF) / 255,
+      ((num >> 16) & 0xFF) / 255,
+      ((num >> 8)  & 0xFF) / 255,
+      (num & 0xFF) / 255
+    ];
+  } catch (e) {
+    alert("hexToRgbaArray error: " + e);
+    return [1, 1, 1, 1];
+  }
 }
 
 export async function initializeViewer(config, instanceId) {
-    try {
-        alert("initializeViewer: start");
-        if (viewerInitialized) return;
-
-        const isIOS = /iPad|iPhone|iPod/.test(navigator.userAgent);
-        const isMobile = isIOS || /Android/i.test(navigator.userAgent);
-
-        // Parse config fields
-        sogsUrl   = config.sogs_json_url;
-        glbUrl    = config.glb_url;
-        canvasBg  = config.canvas_background || "#ffffff";
-        minZoom   = parseFloat(config.minZoom || "1");
-        maxZoom   = parseFloat(config.maxZoom || "20");
-        minAngle  = parseFloat(config.minAngle || "-45");
-        maxAngle  = parseFloat(config.maxAngle || "90");
-        minAzimuth= (config.minAzimuth !== undefined) ? parseFloat(config.minAzimuth) : -360;
-        maxAzimuth= (config.maxAzimuth !== undefined) ? parseFloat(config.maxAzimuth) : 360;
-        minPivotY = parseFloat(config.minPivotY || "0");
-        minY      = (config.minY !== undefined) ? parseFloat(config.minY) : 0;
-
-        modelX          = (config.modelX !== undefined) ? parseFloat(config.modelX) : 0;
-        modelY          = (config.modelY !== undefined) ? parseFloat(config.modelY) : 0;
-        modelZ          = (config.modelZ !== undefined) ? parseFloat(config.modelZ) : 0;
-        modelScale      = (config.modelScale !== undefined) ? parseFloat(config.modelScale) : 1;
-        modelRotationX  = (config.modelRotationX !== undefined) ? parseFloat(config.modelRotationX) : 0;
-        modelRotationY  = (config.modelRotationY !== undefined) ? parseFloat(config.modelRotationY) : 0;
-        modelRotationZ  = (config.modelRotationZ !== undefined) ? parseFloat(config.modelRotationZ) : 0;
-
-        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;
-        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);
-
-        chosenCameraX = isMobile ? cameraXPhone : cameraX;
-        chosenCameraY = isMobile ? cameraYPhone : cameraY;
-        chosenCameraZ = isMobile ? cameraZPhone : cameraZ;
-
-        const canvasId         = 'canvas-' + instanceId;
-        const progressDialog   = document.getElementById('progress-dialog-' + instanceId);
-        const viewerContainer  = document.getElementById('viewer-container-' + instanceId);
-
-        let oldCanvas = document.getElementById(canvasId);
-        if (oldCanvas) oldCanvas.remove();
-
-        const canvas = document.createElement('canvas');
-        canvas.id = canvasId;
-        canvas.className = 'ply-canvas';
-        canvas.style.width = "100%";
-        canvas.style.height = "100%";
-        canvas.setAttribute('tabindex', '0');
-        viewerContainer.insertBefore(canvas, progressDialog);
-
-        canvas.style.background = canvasBg;
-        canvas.style.touchAction = "none";
-        canvas.style.webkitTouchCallout = "none";
-        canvas.addEventListener('gesturestart', e => e.preventDefault());
-        canvas.addEventListener('gesturechange', e => e.preventDefault());
-        canvas.addEventListener('gestureend', e => e.preventDefault());
-        canvas.addEventListener('dblclick', e => e.preventDefault());
-        canvas.addEventListener('touchstart', e => { if (e.touches.length > 1) e.preventDefault(); }, { passive: false });
-        canvas.addEventListener('wheel', (e) => { e.preventDefault(); }, { passive: false });
-
-        progressDialog.style.display = 'block';
-        alert("Canvas created. Loading PlayCanvas...");
-
-        // 1. Import PlayCanvas
-        const pcMod = await import("https://cdn.jsdelivr.net/npm/playcanvas@2.8.0/+esm");
-        alert("PlayCanvas imported.");
-        window.pc = pcMod; // ensures global for script-based scripts
-        // 2. Now all use window.pc from here
-        const pc = window.pc;
-
-        // 3. Graphics Device
-        const gfxOptions = {
-            deviceTypes: getDeviceTypes(),
-            glslangUrl: "https://mikafil-viewer-sgos.static.hf.space/static/lib/glslang/glslang.js",
-            twgslUrl:   "https://mikafil-viewer-sgos.static.hf.space/static/lib/twgsl/twgsl.js",
-            antialias: false
-        };
-        const device = await pc.createGraphicsDevice(canvas, gfxOptions);
-        device.maxPixelRatio = Math.min(window.devicePixelRatio, 2);
-        alert("Graphics device created.");
-
-        // 4. App creation (Application, not AppBase for max compatibility)
-        app = new pc.Application(canvas, {
-            graphicsDevice: device,
-            mouse: new pc.Mouse(canvas),
-            touch: new pc.TouchDevice(canvas),
-            componentSystems: [
-                pc.RenderComponentSystem,
-                pc.CameraComponentSystem,
-                pc.LightComponentSystem,
-                pc.ScriptComponentSystem,
-                pc.GSplatComponentSystem,
-                pc.CollisionComponentSystem,
-                pc.RigidbodyComponentSystem
-            ],
-            resourceHandlers: [
-                pc.TextureHandler,
-                pc.ContainerHandler,
-                pc.ScriptHandler,
-                pc.GSplatHandler
-            ]
-        });
-        alert("App created.");
+  alert("initializeViewer: start");
+
+  if (viewerInitialized) {
+    alert("Already initialized!");
+    return;
+  }
+
+  const isIOS = /iPad|iPhone|iPod/.test(navigator.userAgent) && !window.MSStream;
+  const isMobile = isIOS || /Android/i.test(navigator.userAgent);
+
+  try {
+    // Parse config
+    sogsUrl   = config.sogs_json_url;
+    glbUrl    = config.glb_url;
+    canvasBg  = config.canvas_background || "#ffffff";
+    minZoom   = parseFloat(config.minZoom || "1");
+    maxZoom   = parseFloat(config.maxZoom || "20");
+    minAngle  = parseFloat(config.minAngle || "-45");
+    maxAngle  = parseFloat(config.maxAngle || "90");
+    minAzimuth= (config.minAzimuth !== undefined) ? parseFloat(config.minAzimuth) : -360;
+    maxAzimuth= (config.maxAzimuth !== undefined) ? parseFloat(config.maxAzimuth) : 360;
+    minPivotY = parseFloat(config.minPivotY || "0");
+    minY      = (config.minY !== undefined) ? parseFloat(config.minY) : 0;
+
+    modelX          = (config.modelX !== undefined) ? parseFloat(config.modelX) : 0;
+    modelY          = (config.modelY !== undefined) ? parseFloat(config.modelY) : 0;
+    modelZ          = (config.modelZ !== undefined) ? parseFloat(config.modelZ) : 0;
+    modelScale      = (config.modelScale !== undefined) ? parseFloat(config.modelScale) : 1;
+    modelRotationX  = (config.modelRotationX !== undefined) ? parseFloat(config.modelRotationX) : 0;
+    modelRotationY  = (config.modelRotationY !== undefined) ? parseFloat(config.modelRotationY) : 0;
+    modelRotationZ  = (config.modelRotationZ !== undefined) ? parseFloat(config.modelRotationZ) : 0;
+
+    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;
+    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);
+
+    chosenCameraX = isMobile ? cameraXPhone : cameraX;
+    chosenCameraY = isMobile ? cameraYPhone : cameraY;
+    chosenCameraZ = isMobile ? cameraZPhone : cameraZ;
+
+    const canvasId         = 'canvas-' + instanceId;
+    const progressDialog   = document.getElementById('progress-dialog-' + instanceId);
+    const progressIndicator= document.getElementById('progress-indicator-' + instanceId);
+    const viewerContainer  = document.getElementById('viewer-container-' + instanceId);
+
+    let oldCanvas = document.getElementById(canvasId);
+    if (oldCanvas) oldCanvas.remove();
+
+    const canvas = document.createElement('canvas');
+    canvas.id = canvasId;
+    canvas.className = 'ply-canvas';
+    canvas.style.width = "100%";
+    canvas.style.height = "100%";
+    canvas.setAttribute('tabindex', '0');
+    viewerContainer.insertBefore(canvas, progressDialog);
+
+    // Apply background color from config if present
+    canvas.style.background = canvasBg;
+
+    canvas.style.touchAction = "none";
+    canvas.style.webkitTouchCallout = "none";
+    canvas.addEventListener('gesturestart', e => e.preventDefault());
+    canvas.addEventListener('gesturechange', e => e.preventDefault());
+    canvas.addEventListener('gestureend', e => e.preventDefault());
+    canvas.addEventListener('dblclick', e => e.preventDefault());
+    canvas.addEventListener('touchstart', e => { if (e.touches.length > 1) e.preventDefault(); }, { passive: false });
+
+    // --- Mouse wheel suppression
+    canvas.addEventListener('wheel', (e) => {
+      e.preventDefault(); // Only block page scroll if mouse is over viewer
+    }, { passive: false });
+
+    if (progressDialog) progressDialog.style.display = 'block';
+
+    alert("Canvas created. Loading PlayCanvas...");
+
+    if (!pc) {
+      pc = await import("https://cdn.jsdelivr.net/npm/playcanvas@latest/+esm");
+      window.pc = pc;
+      alert("PlayCanvas imported.");
+    }
 
-        app.setCanvasFillMode(pc.FILLMODE_NONE);
-        app.setCanvasResolution(pc.RESOLUTION_AUTO);
+    // Create app and graphics device
+    let device;
+    try {
+      device = await pc.createGraphicsDevice(canvas, {
+        deviceTypes: ["webgl2", "webgl1"],
+        glslangUrl: "https://mikafil-viewer-sgos.static.hf.space/static/lib/glslang/glslang.js",
+        twgslUrl:   "https://mikafil-viewer-sgos.static.hf.space/static/lib/twgsl/twgsl.js",
+        antialias: false
+      });
+      device.maxPixelRatio = Math.min(window.devicePixelRatio, 2);
+      alert("Graphics device created.");
+    } catch (e) {
+      alert("Graphics device error: " + e);
+      throw e;
+    }
 
-        // Resize observer logic
-        resizeObserver = new ResizeObserver(entries => {
-            entries.forEach(entry => {
-                app.resizeCanvas(entry.contentRect.width, entry.contentRect.height);
-            });
+    const opts = new pc.AppOptions();
+    opts.graphicsDevice = device;
+    opts.mouse = new pc.Mouse(canvas);
+    opts.touch = new pc.TouchDevice(canvas);
+    opts.componentSystems = [
+      pc.RenderComponentSystem,
+      pc.CameraComponentSystem,
+      pc.LightComponentSystem,
+      pc.ScriptComponentSystem,
+      pc.GSplatComponentSystem,
+      pc.CollisionComponentSystem,
+      pc.RigidbodyComponentSystem
+    ];
+    opts.resourceHandlers = [
+      pc.TextureHandler,
+      pc.ContainerHandler,
+      pc.ScriptHandler,
+      pc.GSplatHandler
+    ];
+
+    app = new pc.Application(canvas, opts);
+    app.setCanvasFillMode(pc.FILLMODE_NONE);
+    app.setCanvasResolution(pc.RESOLUTION_AUTO);
+
+    alert("App created.");
+
+    // Resizing
+    resizeObserver = new ResizeObserver(entries => {
+      entries.forEach(entry => {
+        try {
+          app.resizeCanvas(entry.contentRect.width, entry.contentRect.height);
+        } catch (e) { alert("resizeCanvas error: " + e); }
+      });
+    });
+    resizeObserver.observe(viewerContainer);
+
+    window.addEventListener('resize', () => {
+      try {
+        app.resizeCanvas(viewerContainer.clientWidth, viewerContainer.clientHeight);
+      } catch (e) { alert("resizeCanvas error: " + e); }
+    });
+    app.on('destroy', () => resizeObserver.disconnect());
+
+    // Prepare asset loading (SOGS as 'gsplat')
+    const assets = {
+      sogs: new pc.Asset('gsplat', 'gsplat', { url: sogsUrl }),
+      orbit: new pc.Asset('script', 'script', { url: "https://mikafil-viewer-sgos.static.hf.space/orbit-camera.js" }),
+      glb: new pc.Asset('glb', 'container', { url: glbUrl }),
+    };
+    for (const key in assets) app.assets.add(assets[key]);
+
+    // Individual asset error listeners
+    assets.sogs.on('error', (err) => { alert("SOGS asset error: " + err); });
+    assets.orbit.on('error', (err) => { alert("Orbit-camera.js asset error: " + err); });
+    if (assets.glb) assets.glb.on('error', (err) => { alert("GLB asset error: " + err); });
+
+    assets.sogs.ready(() => { alert("SOGS asset ready."); });
+    assets.orbit.ready(() => { alert("orbit-camera.js asset ready."); });
+    if (assets.glb) assets.glb.ready(() => { alert("GLB asset ready."); });
+
+    const loader = new pc.AssetListLoader(Object.values(assets), app.assets);
+
+    loader.on('error', (err) => { alert("Asset loader error: " + err); });
+
+    loader.load(() => {
+      alert("All assets loaded. Starting app...");
+
+      try {
+        app.start();
+      } catch (e) {
+        alert("app.start() error: " + e);
+        throw e;
+      }
+
+      if (progressDialog) progressDialog.style.display = 'none';
+
+      // Add SOGS model
+      try {
+        modelEntity = new pc.Entity('model');
+        modelEntity.addComponent('gsplat', { asset: assets.sogs });
+        modelEntity.setLocalPosition(modelX, modelY, modelZ);
+        modelEntity.setLocalEulerAngles(modelRotationX, modelRotationY, modelRotationZ);
+        modelEntity.setLocalScale(modelScale, modelScale, modelScale);
+        app.root.addChild(modelEntity);
+        alert("Model entity added!");
+      } catch (e) {
+        alert("Model entity error: " + e);
+        throw e;
+      }
+
+      // Add the GLB entity if provided
+      try {
+        if (assets.glb && assets.glb.resource && assets.glb.resource.instantiateRenderEntity) {
+          const glbEntity = assets.glb.resource.instantiateRenderEntity();
+          app.root.addChild(glbEntity);
+          alert("GLB entity added.");
+        }
+      } catch (e) {
+        alert("GLB entity error: " + e);
+      }
+
+      // CAMERA
+      try {
+        cameraEntity = new pc.Entity('camera');
+        // Support background color
+        let bg = [1, 1, 1, 1];
+        if (canvasBg && /^#?[0-9a-f]{6,8}$/i.test(canvasBg.replace("#", ""))) {
+          bg = hexToRgbaArray(canvasBg);
+        }
+        cameraEntity.addComponent('camera', { clearColor: new pc.Color(bg[0], bg[1], bg[2], bg[3]) });
+        cameraEntity.setPosition(chosenCameraX, chosenCameraY, chosenCameraZ);
+        cameraEntity.lookAt(modelEntity.getPosition());
+        cameraEntity.addComponent('script');
+
+        // Pass all attributes to Orbit Camera script
+        cameraEntity.script.create('orbitCamera', {
+          attributes: {
+            focusEntity: modelEntity,
+            inertiaFactor: 0.2,
+            distanceMax: maxZoom,
+            distanceMin: minZoom,
+            pitchAngleMax: maxAngle,
+            pitchAngleMin: minAngle,
+            yawAngleMax: maxAzimuth,
+            yawAngleMin: minAzimuth,
+            minY: minY,
+            frameOnStart: false
+          }
         });
-        resizeObserver.observe(viewerContainer);
-        window.addEventListener('resize', () => app.resizeCanvas(viewerContainer.clientWidth, viewerContainer.clientHeight));
-        app.on('destroy', () => resizeObserver.disconnect());
-
-        // Asset loading
-        const assets = {
-            sogs: new pc.Asset('gsplat', 'gsplat', { url: sogsUrl }),
-            orbit: new pc.Asset('script', 'script', { url: "https://mikafil-viewer-sgos.static.hf.space/orbit-camera.js" }),
-            glb: new pc.Asset('glb', 'container', { url: glbUrl }),
-        };
-        for (const key in assets) app.assets.add(assets[key]);
-
-        const assetList = Object.values(assets).filter(asset => asset.url);
-        const assetListLoader = new pc.AssetListLoader(assetList, app.assets);
-
-        assetListLoader.load(() => {
-            alert("Asset loader started.");
-            if (!assets.sogs.resource) {
-                alert("SOGS asset failed to load.");
-                return;
-            }
-            modelEntity = new pc.Entity('model');
-            modelEntity.addComponent('gsplat', { asset: assets.sogs });
-            modelEntity.setLocalPosition(modelX, modelY, modelZ);
-            modelEntity.setLocalEulerAngles(modelRotationX, modelRotationY, modelRotationZ);
-            modelEntity.setLocalScale(modelScale, modelScale, modelScale);
-            app.root.addChild(modelEntity);
-
-            if (!assets.orbit.resource) {
-                alert("orbit-camera.js asset failed to load!");
-                return;
-            }
-            alert("orbit-camera.js asset ready.");
-
-            if (assets.glb && assets.glb.resource && assets.glb.resource.instantiateRenderEntity) {
-                const glbEntity = assets.glb.resource.instantiateRenderEntity();
-                app.root.addChild(glbEntity);
-                alert("GLB asset ready.");
-            } else {
-                alert("GLB not provided or failed to load.");
-            }
-
-            cameraEntity = new pc.Entity('camera');
-            // Parse and apply background color
-            let bg = [1, 1, 1, 1];
-            if (canvasBg && /^#?[0-9a-f]{6,8}$/i.test(canvasBg.replace("#", ""))) {
-                let hex = canvasBg.replace("#", "");
-                if (hex.length === 6) hex += "FF";
-                const num = parseInt(hex, 16);
-                bg = [
-                    ((num >> 24) & 0xFF) / 255,
-                    ((num >> 16) & 0xFF) / 255,
-                    ((num >> 8)  & 0xFF) / 255,
-                    (num & 0xFF) / 255
-                ];
-            }
-            cameraEntity.addComponent('camera', { clearColor: new pc.Color(bg[0], bg[1], bg[2], bg[3]) });
-            cameraEntity.setPosition(chosenCameraX, chosenCameraY, chosenCameraZ);
-            cameraEntity.lookAt(modelEntity.getPosition());
-            cameraEntity.addComponent('script');
-
-            cameraEntity.script.create('orbitCamera', {
-                attributes: {
-                    focusEntity: modelEntity,
-                    inertiaFactor: 0.2,
-                    distanceMax: maxZoom,
-                    distanceMin: minZoom,
-                    pitchAngleMax: maxAngle,
-                    pitchAngleMin: minAngle,
-                    yawAngleMax: maxAzimuth,
-                    yawAngleMin: minAzimuth,
-                    minY: minY,
-                    frameOnStart: false
-                }
+        cameraEntity.script.create('orbitCameraInputMouse');
+        cameraEntity.script.create('orbitCameraInputTouch');
+        app.root.addChild(cameraEntity);
+
+        alert("Camera added.");
+      } catch (e) {
+        alert("Camera error: " + e);
+      }
+
+      try {
+        app.resizeCanvas(viewerContainer.clientWidth, viewerContainer.clientHeight);
+        alert("resizeCanvas called.");
+      } catch (e) {
+        alert("resizeCanvas error: " + e);
+      }
+
+      try {
+        app.once('update', () => resetViewerCamera());
+        alert("resetViewerCamera scheduled.");
+      } catch (e) {
+        alert("resetViewerCamera schedule error: " + e);
+      }
+
+      // Tooltips support (optional)
+      try {
+        if (config.tooltips_url) {
+          import('https://mikafil-viewer-sgos.static.hf.space/tooltips.js').then(tooltipsModule => {
+            tooltipsModule.initializeTooltips({
+              app,
+              cameraEntity,
+              modelEntity,
+              tooltipsUrl: config.tooltips_url,
+              defaultVisible: !!config.showTooltipsDefault,
+              moveDuration: config.tooltipMoveDuration || 0.6
             });
-            cameraEntity.script.create('orbitCameraInputMouse');
-            cameraEntity.script.create('orbitCameraInputTouch');
-            app.root.addChild(cameraEntity);
-
-            app.setCanvasFillMode(pc.FILLMODE_NONE);
-            app.setCanvasResolution(pc.RESOLUTION_AUTO);
-            app.resizeCanvas(viewerContainer.clientWidth, viewerContainer.clientHeight);
-
-            app.once('update', () => resetViewerCamera());
-
-            // Tooltips support (optional)
-            try {
-                if (config.tooltips_url) {
-                    import('https://mikafil-viewer-sgos.static.hf.space/tooltips.js').then(tooltipsModule => {
-                        tooltipsModule.initializeTooltips({
-                            app,
-                            cameraEntity,
-                            modelEntity,
-                            tooltipsUrl: config.tooltips_url,
-                            defaultVisible: !!config.showTooltipsDefault,
-                            moveDuration: config.tooltipMoveDuration || 0.6
-                        });
-                    }).catch(e => {
-                        alert("Tooltips import failed: " + e);
-                    });
-                }
-            } catch (e) {
-                alert("Tooltips error: " + e);
-            }
-
-            progressDialog.style.display = 'none';
-            alert("App finished initializing. (Last alert)");
-            viewerInitialized = true;
-        });
-
-    } catch (e) {
-        alert("viewer.js error: " + e);
-    }
+            alert("Tooltips loaded.");
+          }).catch(e => { alert("Tooltips module error: " + e); });
+        }
+      } catch (e) {
+        alert("Tooltips try-catch error: " + e);
+      }
+
+      viewerInitialized = true;
+      alert("Viewer initialized success!");
+    });
+
+    alert("Asset loader started.");
+  } catch (e) {
+    alert("Main try-catch error: " + e);
+    throw e;
+  }
 }
 
+// Resets the viewer camera (as in your PLY example)
 export function resetViewerCamera() {
-    try {
-        if (!cameraEntity || !modelEntity || !app) return;
-        const orbitCam = cameraEntity.script.orbitCamera;
-        if (!orbitCam) return;
-
-        const modelPos = modelEntity.getPosition();
-        const tempEnt = new window.pc.Entity();
-        tempEnt.setPosition(chosenCameraX, chosenCameraY, chosenCameraZ);
-        tempEnt.lookAt(modelPos);
-
-        const dist = new window.pc.Vec3().sub2(
-            new window.pc.Vec3(chosenCameraX, chosenCameraY, chosenCameraZ),
-            modelPos
-        ).length();
-
-        cameraEntity.setPosition(chosenCameraX, chosenCameraY, chosenCameraZ);
-        cameraEntity.lookAt(modelPos);
-
-        orbitCam.pivotPoint = modelPos.clone();
-        orbitCam._targetDistance = dist;
-        orbitCam._distance       = dist;
-
-        const rot = tempEnt.getRotation();
-        const fwd = new window.pc.Vec3();
-        rot.transformVector(window.pc.Vec3.FORWARD, fwd);
-
-        const yaw = Math.atan2(-fwd.x, -fwd.z) * window.pc.math.RAD_TO_DEG;
-        const yawQuat = new window.pc.Quat().setFromEulerAngles(0, -yaw, 0);
-        const rotNoYaw = new window.pc.Quat().mul2(yawQuat, rot);
-        const fNoYaw = new window.pc.Vec3();
-        rotNoYaw.transformVector(window.pc.Vec3.FORWARD, fNoYaw);
-        const pitch = Math.atan2(fNoYaw.y, -fNoYaw.z) * window.pc.math.RAD_TO_DEG;
-
-        orbitCam._targetYaw   = yaw;
-        orbitCam._yaw         = yaw;
-        orbitCam._targetPitch = pitch;
-        orbitCam._pitch       = pitch;
-        if (orbitCam._updatePosition) orbitCam._updatePosition();
-
-        tempEnt.destroy();
-    } catch (e) {
-        alert("resetViewerCamera error: " + e);
+  alert("resetViewerCamera called.");
+  try {
+    if (!cameraEntity || !modelEntity || !app) {
+      alert("resetViewerCamera: cameraEntity/modelEntity/app not ready");
+      return;
     }
+    const orbitCam = cameraEntity.script.orbitCamera;
+    if (!orbitCam) {
+      alert("resetViewerCamera: orbitCam missing");
+      return;
+    }
+
+    const modelPos = modelEntity.getPosition();
+    const tempEnt = new pc.Entity();
+    tempEnt.setPosition(chosenCameraX, chosenCameraY, chosenCameraZ);
+    tempEnt.lookAt(modelPos);
+
+    const dist = new pc.Vec3().sub2(
+      new pc.Vec3(chosenCameraX, chosenCameraY, chosenCameraZ),
+      modelPos
+    ).length();
+
+    cameraEntity.setPosition(chosenCameraX, chosenCameraY, chosenCameraZ);
+    cameraEntity.lookAt(modelPos);
+
+    orbitCam.pivotPoint = modelPos.clone();
+    orbitCam._targetDistance = dist;
+    orbitCam._distance       = dist;
+
+    const rot = tempEnt.getRotation();
+    const fwd = new pc.Vec3();
+    rot.transformVector(pc.Vec3.FORWARD, fwd);
+
+    const yaw = Math.atan2(-fwd.x, -fwd.z) * pc.math.RAD_TO_DEG;
+    const yawQuat = new pc.Quat().setFromEulerAngles(0, -yaw, 0);
+    const rotNoYaw = new pc.Quat().mul2(yawQuat, rot);
+    const fNoYaw = new pc.Vec3();
+    rotNoYaw.transformVector(pc.Vec3.FORWARD, fNoYaw);
+    const pitch = Math.atan2(fNoYaw.y, -fNoYaw.z) * pc.math.RAD_TO_DEG;
+
+    orbitCam._targetYaw   = yaw;
+    orbitCam._yaw         = yaw;
+    orbitCam._targetPitch = pitch;
+    orbitCam._pitch       = pitch;
+    if (orbitCam._updatePosition) orbitCam._updatePosition();
+
+    tempEnt.destroy();
+    alert("resetViewerCamera: success");
+  } catch (e) {
+    alert("resetViewerCamera: error: " + e);
+  }
 }