GLTF Texture Rendering Issues

The issues you're experiencing with textures disappearing at certain angles and appearing through other textures are likely related to material rendering problems rather than the loader itself. GLTFLoader is indeed the recommended way to import GLTF files in Three.js.

Possible Causes and Solutions

1. Z-Fighting

When textures appear through other textures, this could be due to "z-fighting" - where two surfaces are positioned too close to each other. The GPU can't determine which one should be in front.

Solution:

• Adjust the near and far planes of your camera
• Ensure your model doesn't have overlapping geometry

2. Material Settings

Textures disappearing at certain angles might be related to material settings:

Solutions:

• Check if your materials have proper side settings:

  JAVASCRIPTCopied
  material.side = THREE.DoubleSide; // Renders both sides of faces

• Verify normal maps are correctly applied
• Ensure your lighting setup is appropriate

3. Transparency Issues

If some materials are transparent, they might need proper sorting:

Solution:

JAVASCRIPTCopied
material.transparent = true;
material.depthWrite = false; // For fully transparent parts
material.alphaTest = 0.5; // For semi-transparent textures

4. Manual Texture Application

While manually applying textures to each mesh is possible, it's generally not necessary when using GLTFLoader as it should handle this automatically. However, if you want to try:

JAVASCRIPTCopied
gltfLoader.load('model.gltf', (gltf) => {
  gltf.scene.traverse((child) => {
    if (child.isMesh) {
      // Access or modify materials
      if (child.material) {
        // Apply custom textures if needed
        const texture = new THREE.TextureLoader().load('path/to/texture.png');
        child.material.map = texture;
        child.material.needsUpdate = true;
      }
    }
  });
  scene.add(gltf.scene);
});

Before manually applying textures, I'd recommend first checking your model for the issues mentioned above, as GLTFLoader should handle texture assignment correctly in most cases.