I checked the car model and i see at least one limitation
There are 2 textures for the smiling face, one for the diffuse ( the color) and one for the alpha the transparency mask. we only support one for the 2 now .
I can also predict that the decal effect won’t look correct because i don’t think we support that correctly
It s a good test, i ll add this model to my list of to dos. for that aspect.
Regarding the trasnparency behind the windshield, i m not surprised, we don;t have a good solution yet and yes transparency are pretty broken. hopefully we ll tackle this one soon…