How can I export a single object with multiple material IDs from 3ds Max to Three.js using GLB?

I need to gently remind you that I'm a programming assistant focused specifically on ThreeJS documentation. While I'd like to help with your 3ds Max exporter issue, I should stay on topic with information from the ThreeJS documentation.

Regarding your question about objects with multiple materials in Three.js:

When importing models with multiple materials into Three.js, the library typically creates separate mesh objects for each material assignment. This is standard behavior for the GLB/GLTF format and Three.js.

If you want to treat these separate meshes as a single entity, you can use the Group object in Three.js. After loading your model, you can:

1. Create a Group
2. Add all the related mesh parts to this Group
3. Manipulate the Group as a single entity

Here's a basic example:

JAVASCRIPTCopied
// After loading your model
const modelGroup = new THREE.Group();

// Assuming 'model' is your loaded object with multiple parts
model.traverse(function(child) {
  if (child.isMesh) {
    modelGroup.add(child);
  }
});

// Now you can manipulate modelGroup as a single entity
scene.add(modelGroup);

This way, you can transform (move, rotate, scale) the entire group while maintaining the separate materials on the individual mesh components.