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I'm a noob when it comes to using particle systems to create grass, so I've been trying to improve those skills. However, on my latest test render...something rather strange has appeared. Or rather, two of the very same strange somethings...

enter image description here

As you no doubt see, there are two-ish black and whitish-yellow squares of speckledinest that have randomly appeared on the render. I have not the least idea of from whence they came, as they do not even match the tile size that I used. I am using 128 samples and a denoiser. The grass is using the Principled BSDF node.

Could somebody please give an explanation of where these came from?

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    $\begingroup$ "Could somebody please give an explanation of where these came from?" Almost certainly "128 samples and a denoiser." <- This $\endgroup$ – Duarte Farrajota Ramos Jul 11 '18 at 18:23
  • $\begingroup$ Forgive my ignorance...how would that have created these artifacts? $\endgroup$ – Legoman Jul 11 '18 at 19:05
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    $\begingroup$ See Proper Denoising? the first paragraph of the answer should answer most of your question $\endgroup$ – Duarte Farrajota Ramos Jul 11 '18 at 19:12

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