Handling GLTF Model Caching Issues

Based on the information available, I can provide some guidance on your issue with useGLTF caching, though I should note that the specific useGLTF hook isn't directly covered in the core Three.js documentation I have access to.

The issue you're experiencing appears to be that when you update modelUrl, the old model is still being loaded from cache despite your attempt to clear it using useGLTF.clear(modelUrl).

Potential Solutions

1. Timing of Cache Clearing: Your current implementation clears the cache in the cleanup function of the useEffect. Try clearing the cache before loading the new model:

JAVASCRIPTCopied
useEffect(() => {
    // Clear previous model first
    useGLTF.clear(modelUrl);
    
    // Then load the new one
    const { nodes } = useGLTF(modelUrl);
    
    return () => {
        // Cleanup when component unmounts
        useGLTF.clear(modelUrl);
    };
}, [modelUrl]);

2. URL Query Parameter: Add a timestamp or random query parameter to force a new load:

JAVASCRIPTCopied
const timestamp = Date.now();
const urlWithTimestamp = `${modelUrl}?t=${timestamp}`;
const { nodes } = useGLTF(urlWithTimestamp);

useEffect(() => {
    return () => {
        useGLTF.clear(urlWithTimestamp);
    };
}, [urlWithTimestamp]);

3. Manual Renderer Clearing: If you have access to the renderer, you might need to manually clear its buffers:

JAVASCRIPTCopied
// Assuming you have access to the renderer
renderer.clear(true, true, true); // Clears color, depth, and stencil buffers

4. Check for Library-Specific Solutions: Since useGLTF appears to be from a library built on top of Three.js (likely react-three-fiber or similar), check the library's documentation for specific caching mechanisms or known issues.

Without more specific information about the library you're using, these are general approaches that might help resolve your caching issue. If these don't work, you might need to consult the documentation for the specific library that provides the useGLTF hook.