Wrong material (wrong color) renderer bug?

[trusktr]

@Mugen87 I wonder if the issue here is related to this:

[r139 BUG?] `raycaster.intersectObject` fails because groupMaterial index is -1 in imported FBX model

The reality is a major program (Cinema4d) exports FBX files with a large number of problems, not just this one. While working on the FBXLoader I did try to take a pragmatic approach and it already does handle many cases like this even though they are technically incorrect. However, towards the end nearly all the remaining problems were coming from models exported by the buggy Cinema4d exporter and I was finding that fixing one model often resulted in breaking other (correct) models and I was ha…

So far, now that I think about this, I have only experienced this issue in scenes that use FBXLoader.