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I have imported a Gltf file into blender. I setup a sun light and rendered it with eevee. it works absolutely fine when rendered with eevee, but in cycles some part of the plane becomes dull with a different intensity.

image thats rendered with black parts in between Image rendered with black parts.

This is the material that is applied Material configuration

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    $\begingroup$ maybe in the Object Data panel > Geometry Data > Clear Custom Split Normals Data? $\endgroup$
    – moonboots
    Nov 14, 2022 at 17:14
  • $\begingroup$ @moonboots it was not enabled. Sculpt Mask Data was enbable. I have cleared it, still the render has irregular texture pattern $\endgroup$ Nov 15, 2022 at 2:14

2 Answers 2

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A link to your GLTF file is not helping so much because we don't know what settings you used to import it. So I imported it with the default settings.

After that I saw the same pattern, I selected a front face and deleted it, there was another one and so on - the front side had 6 layers of faces overlapping in the same place as suspected.

To avoid this, you should enable the option Merge Vertices when importing the file. In this case Blender checks if there are multiple vertices/faces in the same location and merges them.

merge vertices

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  • $\begingroup$ Hi thank you very much its working now. with merge vertices while importing. I am very new to blender. Gltf was prepared from three js scene using Gltf exporter. I dont know why it created muliple faces while exporting. While creating three Geometry i have created only 2 faces per side of the cuboid. Thanks anyways. $\endgroup$ Nov 15, 2022 at 8:32
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Check if your mesh has faces overlaying on top of each other, some times duplicates causes render errors like that

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  • $\begingroup$ it was simple cube. and it did not had any over lapping meshes $\endgroup$ Nov 15, 2022 at 4:41
  • $\begingroup$ @BoyapatiRaviKumar First of all, your screenshot doesn't show a cube so what are we seeing there? And secondly, well that this pattern appears in Cycles but not in Eevee is a very strong indication that it's possibly overlapping. You said it's an imported GLTF file - why do you need to import a simple cube? Are you sure it was a simple cube? $\endgroup$ Nov 15, 2022 at 7:05
  • $\begingroup$ @GordonBrinkmann Below is the gltf content. The poroblem exists for some of other meshes as well. i have deleted and kept only one mesh for reference. link $\endgroup$ Nov 15, 2022 at 7:19
  • $\begingroup$ @GordonBrinkmann while checking i have created another cube with similar dimensions. it was looking fine in cycles as well $\endgroup$ Nov 15, 2022 at 7:26
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    $\begingroup$ @BoyapatiRaviKumar I checked your file (see my answer) and I don't know why you are so sure there are no overlapping faces - because there are. A lot. So downvoting Roger's answer just because you don't know it's correct is not a fair move. $\endgroup$ Nov 15, 2022 at 7:46

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