This is ridiculous, 3ds Max when exporting gbl does not support the hierarchy of objects, does not support mipmap (textures flicker), incorrectly displays transparency (alpha channel), renames texture maps in the gbl file. See how wonderful Babylon exporter plugin does it. Even the free blender does it all perfectly!
And you can't choose a color by colormap - gbl does not support it!
The funniest thing is, 3ds max does not know how to import .glb format, while the free blender can do it. Bravo Autodesk!