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I’m not sure what the problem is you’re having with materials, the colors on the left show which colors are applied to the blocks on the right. Again, I’m not sure how this can be improved.
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I’ll take this as a feature request and consider adding more viewing options.
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Automatically generating UV maps is not a good process and wouldn’t recommend it even if the software allows for it. The next version of Asset Forge is getting support for color map UV’s, however the usual UV you will find on pre-made models is not planned because it simply is technically not possible to do with good results.