For those who are or will make new 3D models for Kicad:
In order to raise awareness, I created two tutorials that
works as a reference and guide to understand and how to set proper
materials to 3D models to be used in KiCad 3D-Viewer (or any other render)
The main scope are electronic components, VRML files, KiCad 3D-Viewer (current or any future version)
I’ve placed the documents in my cloud:
Let me know if I can assist you or help with any clarification!