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This height texture is made out from a photo, but it leave circle looking thing on the render result. How can I fix this problem? Thanks!

enter image description here

enter image description here

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The problem has resolved. It is because of the texture image is 1k 8bit. So I used a 32bit 3K image to make the texture for rendering. During this problem, I also discovered Photoshop 3D filter makes pretty good bump and normal textures.

These two articles explained it very well.

How to get rid of the odd lines shown in the image?

Why does my displacement look jagged - Cycles?

Keep blending, be safe and peace.

enter image description here

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