Rendering app doesn't load: diagnose and fix initialization #120
Description
The 3D modeling app fails to load, remaining stuck at the loading state. Immediate action is needed to diagnose and resolve the initialization and rendering issue.
Issue
- App is stuck at "Loading..." and does not display the 3D scene.
Suspected Causes
- Missing or misconfigured dependencies (e.g., Three.js, OrbitControls).
- JavaScript runtime errors preventing initialization.
- Browser compatibility issues or CORS errors with module imports.
- Problems with how the rendering loop is started.
Solution Steps
- Refactor the initialization code to use stable, non-module Three.js CDN links for maximum compatibility.
- Add robust error handling and visible debug messages to the app interface.
- Test loading all dependencies and ensure the scene renders a simple cube and grid.
- Remove unnecessary extras (like OrbitControls) until basic rendering works.
- Add step-by-step status updates so any failure point is visible to the end user.
- Test across multiple browsers for compatibility.
Next Actions
- Fix and simplify the index.html with correct Three.js script loading, error handling, and minimal scene setup.
- Ensure status updates are shown during each initialization step and errors are logged to the console.
- Report back with the fixed code and any residual error details if problems persist.
If you have an existing index.html, replace it with the following simplified version and test if it loads. If errors persist, share the exact error message from the browser console.
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>3D Modeling App - Debug Version</title>
<style>
body { overflow: hidden; background: #f0f0f0; }
#status { position: fixed; top: 50%; left: 50%; transform: translate(-50%, -50%); background: white; padding: 20px; border-radius: 8px; font-family: Arial, sans-serif; z-index: 1000; }
#canvas-container { position: fixed; top: 0; left: 0; width: 100%; height: 100%; }
</style>
</head>
<body>
<div id="status">Initializing...</div>
<div id="canvas-container"></div>
<script>
const status = document.getElementById('status');
function updateStatus(msg) { status.textContent = msg; console.log(msg); }
function handleError(error) { updateStatus('Error: ' + error.message); console.error(error); }
async function init() {
try {
updateStatus('Loading Three.js...');
const script = document.createElement('script');
script.src = 'https://cdnjs.cloudflare.com/ajax/libs/three.js/r128/three.min.js';
await new Promise((res, rej) => { script.onload = res; script.onerror = () => rej(new Error('Three.js failed to load')); document.head.appendChild(script); });
updateStatus('Setting up scene...');
const scene = new THREE.Scene();
scene.background = new THREE.Color(0xf0f0f0);
const camera = new THREE.PerspectiveCamera(75, window.innerWidth/window.innerHeight, 0.1, 1000);
camera.position.set(0,5,10);
const renderer = new THREE.WebGLRenderer({antialias:true});
renderer.setSize(window.innerWidth, window.innerHeight);
document.getElementById('canvas-container').appendChild(renderer.domElement);
const grid = new THREE.GridHelper(20,20); scene.add(grid);
const geometry = new THREE.BoxGeometry(2,2,2);
const material = new THREE.MeshBasicMaterial({color:0x00ff00, wireframe:true});
const cube = new THREE.Mesh(geometry, material); cube.position.y = 1; scene.add(cube);
function animate() { requestAnimationFrame(animate); cube.rotation.y += 0.01; renderer.render(scene, camera); }
window.addEventListener('resize', () => { camera.aspect = window.innerWidth/window.innerHeight; camera.updateProjectionMatrix(); renderer.setSize(window.innerWidth, window.innerHeight); });
animate();
setTimeout(() => { status.style.display = 'none'; }, 1000);
} catch (error) { handleError(error); }
}
window.addEventListener('load', () => { updateStatus('Starting initialization...'); init().catch(handleError); });
</script>
</body>
</html>