What is the status on Multiple Materials?

Question

I cannot find any documentation on multiple materials - i know MultiMaterial has been deprecated but how does it work now?

Does three.js support this and if so how does faceVertexUvs map to multiple material (i mean a practicle example please)

Answer 1

To apply multiple materials to an object, you are now able to assign them just as an array to the material property.

mesh.material = [material1, material2, material3];

See Migration Guide (r84 → r85):

MultiMaterial has been removed. Use an Array instead.

The faceVertexUvs is a multidimensional array, where the first index represents the material index.

geometry.faceVertexUvs[ materialIndex ][ faceIndex ][ vertexIndex ]

(Reference: three.js - geometry.faceVertexUvs[0][0][index] is not the same as geometry.vertices[index])

The Three.js Docs could be indeed a bit better in both cases.