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I am having a problem with my shading when using displacement. enter image description here

This is what it should look like from the tutorial I am following (https://www.youtube.com/watch?app=desktop&v=urQT2tDV1qw)

enter image description here

Here are my nodes (the group just sets up generated color coordinates)

enter image description here if anyone could help it would be greatly appreciated.

edit: here is it without adaptive subdivision: enter image description here

Meh Meh
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  • Hi! do you have enough geometry? Did you add the subdivision surface modifier? – Nand 27 Jun 15 '21 at 12:03
  • Add a blend file or try to analyze the tutorial step by step. Also try applying transformations (ctrl+A) if you have scaled it in middle. – Nand 27 Jun 15 '21 at 12:12
  • so I just tried redoing the whole scene and I'm getting the same problem. The screenshot above is using adaptive subdivision but the problem still exists when using a basic subdivision modifier. When not using experimental subdivision I am getting an odd creasing where the edges would be – Meh Meh Jun 15 '21 at 12:27
  • try to add your blend file here: https://blend-exchange.com/

    It would easy to look into the issue that way :D

     – Nand 27 Jun 15 '21 at 12:29
  • – Meh Meh Jun 15 '21 at 12:36
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    You're missing the displacement node, my friend. – Allen Simpson Jun 15 '21 at 13:33
  • This look to me as if it might have a 'Shadow Terminator' problem. See here – Robin Betts Jun 15 '21 at 14:55

2 Answers2

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You have chosen Displacement and bump in the displacement settings, which is resulting in a bump at the edges.

Try changing it to displacement only.

enter image description here

Nand 27
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You need to plug your calculation into the Height input of a Displacement node before the Material Output.

enter image description here

Allen Simpson
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  • Have you tried this? When I try adding the displacement node to the set up it deforms the object! I don't think you should need it since, the coordinates are already manipulated. (sorry I don't know the exact terminology) – Nand 27 Jun 15 '21 at 13:57
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    What Default Cube is trying to set up is a displacement to make a perfect sphere from a primitive, so he normalizes to displace out 1m in all directions and subtracts out the original mesh position. It's not necessary and sometimes he does weird stuff at the beginning of his tuts. (Afaik) – Allen Simpson Jun 15 '21 at 14:05