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Wavy-Pixelated Shading

Hi, I have made a hard surface knife model. I have made two versions, low poly and high poly. I used subdivision smoothing on high poly, basically standard hard surface modeling workflow. However, I got wavy-pixelated shading in Unity 3D and Marmoset. This shading problem does not appear in Substance Painter. Then I tried to do the same thing for a simple cube. Basically, I beveled corners of this cube and used subdivision smoothing. 

I want to tell what I have tried: 

I tried to export as 16 bit as png and tiff. No change. 
I tried to exclude smoothing groups in fbx support, no change.

IMPORTANT: This distortions(whatever you call it) get more noticeable as I decrease roughness and increase metalicnes. If it is kind of wood material, this lines-pixels-waves are not noticeable. 


This is my UV. I harden UV seam edges as it should be and islands seperated. 


This is taken in Substance Painter, and there is no problem here.


This is taken in Unity. As you can see, there is pixelated shading. In some models, this seems like wavy-pixelated. In here shading looks pixelated. I thought, there maybe a problem in Unity 3d so I tried it in Marmoset.



This is taken in Marmoset. As you can see, these weird lines still exist.


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