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Odd Pixelated Highlights... Why?

I’m having this odd issue when importing a texture from Substance Painter into UE4 and applying to my environment mesh. I thought it was a lighting issue, but I don’t think it is. It doesn’t appear with stationary point lights but does with every other light. I checked lightmaps and everything but that didn’t fix it. I think it may be an issue with importing the textures. The artifacts aren’t on the texture maps themselves, but they appear with the Base Color and AO maps when they’re plugged into an Unreal material. It doesn’t appear with the Normal maps at all.

I can’t figure it out. Does anyone have a clue what the issue might be?