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I've been encountering an issue when rendering a metallic object in Blender Cycles, where a strange pattern appears on the reflection of the model. I've tried using shade smooth, auto smooth, and adjusting normals, but these are making any difference. Here's a screenshot of the issue:

enter image description here

Here part of the mesh (the center is blurred because it is under NDA):

enter image description here

and here are my shader nodes:

enter image description here

Has anyone faced a similar problem with metallic materials, or can anyone offer any guidance on how to resolve this issue? Any help or suggestions would be greatly appreciated!

Thank you in advance.

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  • $\begingroup$ Hello could you please share your object or at least a part of it? $\endgroup$
    – moonboots
    Apr 23, 2023 at 19:38
  • $\begingroup$ I can show you the only part of the mesh $\endgroup$
    – denoise
    Apr 23, 2023 at 19:49
  • $\begingroup$ If you're using a Normal Map node, try decreasing the strength $\endgroup$ Apr 23, 2023 at 19:49
  • $\begingroup$ Just cut off a small part of the mesh and share it $\endgroup$
    – moonboots
    Apr 24, 2023 at 6:38
  • $\begingroup$ here is a cut: edgardberendsen.com/public/bottle_cap.001.fbx $\endgroup$
    – denoise
    Apr 24, 2023 at 6:47

1 Answer 1

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As said in comments, there is too much geometry which make creases, du to their geometry.

So decimating can be a way to do it. Won't be a perfect result, but it makes most of the issue disappear:

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In edit mode, select all (except a special part but see below) and use the menu "Mesh/Clean up/Decimate Geometry". Then in the operator panel bring the ratio down to 0.25 (or make some tests for other values).

enter image description here

Special part: I think you've cutted the top part (NDA, etc.). So there is a special case for the faces at the cut.

Before decimating, in face selection mode, use "Select Sharp Edges" from the "Select" menu (edit mode), invert the selection then decimate.

An example file but decimated twice at 0.25 as if not it was too big to upload here:

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