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does anybody know why I get this final render in CUDA Cycles. I get this results when I try to render with CPU and GPU together, like they have set different number of samples or CPU try to catch up the GPU and don't render all samples: enter image description here

GPU or CPU only render doesn't leave those squares, but what is interesting is that number of sampling doesn't change anything...I get the same noisy render when I set 400 samples and 20000 samples and the render time doesn't change, in both samples cases time is the same and I couldn't achieve better results.

I use latest Blender version 2.92, CPU Intel i5, 16 GB of RAM, Nvidia GTX 1050 Ti...win 10.

Is it possible that some features of Octane render engine, which I try day before and uninstall afterwards, has left behind and messed up my cycles render?

I have just noticed that the number of render samples are somehow limited to 32???

Any Idea?

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    $\begingroup$ do a factory reset on your blender. you will not lose any file but any adjustment to blender will be lost like: startup scene and your costume themes, key shortcuts, favs etc $\endgroup$
    – Mobin
    Feb 26, 2021 at 9:44

2 Answers 2

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I have found out what cause the problem!!!

One of my area light which I have use to imitate lights of the wall lamp, has been partly inside of the object:

enter image description here

That cause the artefacts and lot of noise. Now, the image is crystal clear!

enter image description here

I hope this will help others with same problem ;)

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I found out why my render is limited to 32 samples:

enter image description here

At some point I wanted to override the material and I left 32 samples in Material override samples field.

But I still have those artefacts (tiles) which my CPU or GPU left behind :(, and had some strange line in the middle of render...

enter image description here

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  • $\begingroup$ Create a new scene and place some primitives around and then do a hybrid render. See if this problem is present in a new file $\endgroup$ Feb 26, 2021 at 21:32
  • $\begingroup$ I've already try that...and it works normally.... :( $\endgroup$
    – Igor
    Feb 27, 2021 at 22:46
  • $\begingroup$ Hmm... you know I've seen the 1050 give some strange behavior once or twice, maybe there's a certain driver version you should go for, but I'm not sure. $\endgroup$ Feb 27, 2021 at 23:37
  • $\begingroup$ Thanks for suggestion :) $\endgroup$
    – Igor
    Mar 1, 2021 at 6:33

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