I was messing with UV unwrapping, and this is what happened:

The after

I reset the UV map, but to no result. For reference, I have older render of the same glass (the version which was unfortunately overwritten):

enter image description here

How to make it smooth again?

It looks like there are two faces in the same place oriented other ways. That's how face orientation view looks like: How to rotate these faces?

Face orientation

  • $\begingroup$ Could it be that your texture is using something other than the UV coordinates? Check your material nodes and disconnect the condensation texture to check if the issue is caused by the material. $\endgroup$ – Robert Gützkow Nov 30 '19 at 19:14
  • $\begingroup$ The problem is... that I don't use any texture. I only messed with UV unwrapping, nothing with textures. $\endgroup$ – P4wlos222 Nov 30 '19 at 19:17
  • $\begingroup$ It's strange, because the plate has same linked material as cup, but it is still intact. $\endgroup$ – P4wlos222 Nov 30 '19 at 19:22

Ok. The solution was to recalculate normals by using Shift + N . The problem was, that faces were facing wrong way. Blender renders fronts of faces in higher quality than backs, and mine were facing front and back in checkerboard, so that explains checkerboard thing. Recalculating normals rotated them the right way. I think that they rotated when I was messing with UV unwrapping.


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