Using Raw WebGL Textures with Three.js

The issue you're experiencing with infinite repeating of your scene as a texture is likely due to how you're handling the texture initialization and assignment. When working with raw WebGL textures in Three.js, there are a few important considerations.

Better Approach

Instead of the method you're using, Three.js provides a cleaner way to use external WebGL textures through the THREE.DataTexture class:

JAVASCRIPTCopied
// Create a Three.js texture that references your WebGL texture
const texture = new THREE.Texture();

// Set necessary properties
texture.image = {width: yourTextureWidth, height: yourTextureHeight};
texture.format = THREE.RGBAFormat; // Or the appropriate format
texture.type = THREE.UnsignedByteType; // Or the appropriate type
texture.minFilter = THREE.LinearFilter; // Adjust filtering as needed
texture.magFilter = THREE.LinearFilter;
texture.needsUpdate = false; // Important: don't trigger internal texture creation

// Get the texture properties and assign your WebGL texture
const texProps = renderer.properties.get(texture);
texProps.__webglTexture = myWebGLTexture;
texProps.__webglInit = true;

// Now you can use the texture in your material
myMaterial.map = texture;
myMaterial.needsUpdate = true;

Key Issues with Your Current Approach

1. The forceTextureInitialization function is causing your scene to be rendered to the texture, which explains the infinite recursion effect.

2. You need to properly set the texture dimensions and format to match your WebGL texture.

3. Setting needsUpdate = false is crucial to prevent Three.js from overwriting your texture.

4. Make sure to set __webglInit = true to tell Three.js the texture is already initialized.

If you're still having issues, you might want to consider using Three.js's WebGLRenderTarget for more complex texture generation scenarios, or the newer ExternalTexture API if you're using a recent version of Three.js.