Material Rendering Issues with Maya GLB Export

When exporting from Maya to GLB format for use in Three.js, you're encountering a common issue with material conversion. Maya's Blinn and Lambert materials don't directly translate to glTF/GLB standard materials.

Possible Solutions

1. Use PBR Materials in Maya: The glTF format works best with Physically Based Rendering (PBR) materials. Try converting your Blinn and Lambert materials to Arnold Standard Surface or other PBR-compatible materials before export.

2. Manual Material Assignment in Three.js: You may need to assign appropriate materials in Three.js after loading the model:

JAVASCRIPTCopied
const loader = new THREE.GLTFLoader();
loader.load('your-model.glb', (gltf) => {
    gltf.scene.traverse((node) => {
        if (node.isMesh) {
            // Create a new material
            node.material = new THREE.MeshStandardMaterial({
                color: 0x00ff00,  // Adjust color as needed
                roughness: 0.5,
                metalness: 0.5
            });
        }
    });
    scene.add(gltf.scene);
});

3. Check Lighting: Ensure your Three.js scene has appropriate lighting to see the materials:

JAVASCRIPTCopied
const ambientLight = new THREE.AmbientLight(0xffffff, 0.5);
scene.add(ambientLight);

const directionalLight = new THREE.DirectionalLight(0xffffff, 1);
directionalLight.position.set(5, 10, 7.5);
scene.add(directionalLight);

4. Try Different Export Settings: If using the Verge3D exporter, check if there are options to better preserve material properties.

Three.js offers several material types that might better match what you're trying to achieve:

• MeshStandardMaterial (PBR-based)
• MeshPhongMaterial (similar to Blinn)
• MeshLambertMaterial (similar to Lambert)

If you need more specific help, consider sharing your code for loading and rendering the model in Three.js.