Hey @gold_fish, I've been testing out your script and compared it to The Hero's:     Left:Right: Goldfish/The hero's imports. Red colors are painted by me, the blue bit is a bug in the importer script though. The top row is those models exported and re-imported back into 3ds Max     It will help to have some documentation about this:   Would it be possible to add a tooltip to this to indicate that, when ticked, this option disables light