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I encountered a problem with emission light and shadow I get after rendering. Namely, I create the cell light as you can see in screenshot, and gave them emission material as light source. Also, I create reflection background plate.

I tried everything in Cycles mode of rendering...without Denoising (I get really grainy render), with Denoising default setup (grainy effect just get blurred but it's still visible)...increasing the Radius value to max (I get combination of grainy and blurry render).

enter image description here

Any suggestion, what to change to get clear photo realistic image?

Thanks.

Igor
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    Hello :). Please add the number of samples you used, and your Blender version. Just to narrow down possible problems. Thank you. – jachym michal Feb 01 '20 at 16:58
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    Up your samples to a minimum of 400 (which is still pretty low) and try intel's denoiser: Can't Get New Intel Denoiser to Work on Projects – brockmann Feb 01 '20 at 17:03
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    Does this answer your question? How to avoid noisy renders in Cycles? – brockmann Feb 01 '20 at 17:07
  • Thank you for suggestions...I tried with 512 render samples but I didn't get much better render. Blender version is 2.81a. Also, with denoiser I get those blurry artifacts... – Igor Feb 01 '20 at 17:33
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    By using intel's denoiser? @Igor Really? Should work. Otherwise I suggest upload a simplified file (without the furniture) to https://blend-exchange.giantcowfilms.com/ and I'll give it a shot... – brockmann Feb 01 '20 at 17:36
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    2min, 512 samples, area lights, intel denoiser: https://i.stack.imgur.com/TJdOj.jpg – brockmann Feb 01 '20 at 18:05
  • Hm, well...I'm not sure it's a Intel's denoiser, but some denoiser is :). It's denoising option in View layer properties...

    I'll appreciate if you can help me with this....here is the file:

    – Igor Feb 01 '20 at 18:11
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    Wrong one... how the intel denoiser looks like: https://i.stack.imgur.com/ErAlu.png at 512 samples (and missing textures), Have a look into my file: https://blend-exchange.giantcowfilms.com/b/jj2smmpy – brockmann Feb 01 '20 at 18:32
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    To answer your question: the artefacts are coming from the denoiser in combination with a too low sample count (32, you would need 800+) as explained in the answers of the linked duplicate, again here: https://blender.stackexchange.com/questions/4980/how-to-avoid-noisy-renders-in-cycles BTW: You might want to add a Portal Light for the window to optimize render times. – brockmann Feb 01 '20 at 18:36
  • Thank you so much!!! I'm new in Blender but I've use some other 3D modeling app (Solidworks, Modo)...anyhow, I'ts always better to ask than to loose couple of hours to figure out how things works.... :) – Igor Feb 01 '20 at 18:57

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