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Do you have any idea what is causing these artifacts on my cycles render?

I'm using a sun light source to illuminate the scene. 128 samples.

I've pasted a screenshot of the material that the artifacts are happening on

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  • $\begingroup$ Denoising will introduce new artifacts, and is certainly not a substitute for a decent number of samples. Read: How to properly denoise renderings? $\endgroup$
    – user1853
    Feb 21 '19 at 16:37
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I solved the problem by raising the samples count to 400

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  • $\begingroup$ Looks as if you were using denoising on a extremely low sample count. $\endgroup$
    – Chris
    Feb 21 '19 at 14:19
  • $\begingroup$ I did use denoising, so it could definitely have been that. I have just never seen it before and I always use denoising. Even with low sample count $\endgroup$
    – Krellzar
    Feb 21 '19 at 14:23
  • $\begingroup$ The default denoiser of Blender has some issues especially with monotone and flat surfaces, which your case does fit perfectly. The results are those clouds that form. $\endgroup$
    – Chris
    Feb 21 '19 at 14:32

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