I'm doing the Blender course from Polygon Runway, and in my second attempt I ran into some odd artifacts that I can't pin down. They are only visible when rendering in cycles, and I'm quite sure there's an issue with my geometry, but I don't understand what it is. I've also uploaded the file in question here:


  • There don't seem to be any overlapping things, as far as I can see
  • The face appears to be flat
  • I tried merging duplicate vertices and the like, to no avail
  • I deleted the face to see if anything else showed, but also negative

It's probably something obvious, so I hope someone here can point me to the issue :)

cycles visual artifacts example

  • 1
    $\begingroup$ you are dealing with non-planar geometry. Maybe these links can help you: blender.stackexchange.com/questions/119874/… and blender.stackexchange.com/questions/56755/… $\endgroup$
    – susu
    Apr 23, 2020 at 21:55
  • $\begingroup$ Thanks :D If you post it as an answer I can also accept it. Also is there a way to see this outside of cycles? $\endgroup$
    – fresskoma
    Apr 23, 2020 at 22:00
  • 2
    $\begingroup$ All 3D programs will suffer from this. You cannot "bend" faces. You need to subdivide them to have curvature. $\endgroup$
    – susu
    Apr 23, 2020 at 22:03
  • $\begingroup$ Oh now I get it. I didn't look at it from the top. I was under the impression that they were all aligned, but they are slightly shifted. Thanks! $\endgroup$
    – fresskoma
    Apr 23, 2020 at 22:40


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