@lisyarus @breakin You can have material properties rather than just colour, these are explained in the reference https://github.com/ephtracy/voxel-model/blob/master/MagicaVoxel-file-format-vox-extension.txt though there are some gotchas so I would refer to https://github.com/jpaver/opengametools/blob/master/src/ogt_vox.h which has the material parameters decoded somewhat.
There's also some discussion in the issues, and I can help if you need.