More specifically, it has to do with Mat1.
I removed both and it worked.
I removed Mat and left Mat1 and it didn’t work.
I removed Mat1 and left Mat and it worked.
Something about that texture. Also, not sure why you have 2 textures. Both are set to UVW
EDIT: if you turn the color channel on for Mat1 it works as well.
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Tim Shetz
c4dtraining.com