Mobile Rendering Issues with Three.js Objects

Based on your description, you're experiencing a common issue with Three.js rendering on mobile devices. When some 3D objects appear as white while others render correctly, this often points to hardware limitations or WebGL compatibility issues on mobile devices.

Potential Causes

1. WebGL Limitations: Mobile devices typically have less powerful GPUs with stricter memory constraints than laptops.

2. Texture Size Limits: Some mobile GPUs have maximum texture size limitations.

3. Shader Complexity: Complex shaders might not compile properly on certain mobile GPUs.

4. Memory Constraints: Adding a new 3D object might have pushed your scene beyond what some mobile devices can handle.

Possible Solutions

1. Implement Level of Detail (LOD):

   JAVASCRIPTCopied
   import { LOD } from 'three'
   import { useRef, useEffect } from 'react'
   import { useThree } from '@react-three/fiber'
   
   function AdaptiveModel() {
     const { viewport } = useThree()
     const lod = useRef()
     
     useEffect(() => {
       // Add different detail levels based on device capabilities
       // Lower poly models for mobile
     }, [])
     
     return <primitive object={lod.current} />
   }

2. Check for WebGL Capabilities:

   JAVASCRIPTCopied
   import { useEffect, useState } from 'react'
   import { WEBGL } from 'three/examples/jsm/WebGL'
   
   function Scene() {
     const [supportsWebGL2, setSupportsWebGL2] = useState(true)
     
     useEffect(() => {
       const webgl2Support = WEBGL.isWebGL2Available()
       setSupportsWebGL2(webgl2Support)
       
       // Render appropriate version based on capability
     }, [])
     
     return supportsWebGL2 ? <FullScene /> : <SimplifiedScene />
   }

3. Optimize Material Usage:

   • Use simpler materials for mobile
   • Reduce texture sizes
   • Combine textures into texture atlases

4. Renderer Configuration:

   JAVASCRIPTCopied
   import { Canvas } from '@react-three/fiber'
   
   function App() {
     return (
       <Canvas
         gl={{
           powerPreference: "high-performance",
           antialias: false,
           stencil: false,
           depth: false
         }}
       >
         {/* Your scene */}
       </Canvas>
     )
   }

5. Progressive Loading:

   • Load simplified versions first
   • Replace with detailed models when/if device proves capable

I recommend implementing a device capability detection system and serving appropriate content based on the device's capabilities rather than assuming all devices can handle the same content.