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I have imported a model as obj. from rhino to blender. When i use the Cycles render, some faces are black no matter which material i choose. I have already tried to flip the normals but that didnt work. I also tried to delete a face when in edit mode and replace it with an extruded edge but that doesnt fix the prblem either. I can only delete the faces and replace them with planes in obj mode. Here are some pictures of the problem. enter image description hereenter image description here

Also in material preview mode some models appear with a gradient on them.enter image description here

iridijon
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  • overlapping faces? clear custom split normals data? – moonboots Sep 16 '21 at 15:50
  • no overlapping faces. i didnt know about the 2nd one but i found that button under geometry data and hit it but didnt fix the problem. Is that what you meant? – iridijon Sep 16 '21 at 16:01
  • yes that's what I meant, maybe share a part of your file where we can see the problem: https://pasteall.org/blend/ – moonboots Sep 16 '21 at 16:14
  • https://pasteall.org/blend/9a441f0b245348d3960ad5258dc6bff7 take a look if you can – iridijon Sep 16 '21 at 16:44
  • Those issues are caused by two things Z-fight https://blender.stackexchange.com/questions/21/how-do-i-avoid-rendering-glitches-from-overlapping-faces and wrong Face orientation https://blender.stackexchange.com/questions/12165/how-to-make-all-faces-flip-to-the-right-consistent-direction ... and because Face orientation is bigger issue here I voted as dupli of FO. – vklidu Feb 26 '22 at 19:27

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