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I have a problem here on my last project with noise. For some reason I have some white dots on this render, do you have any idea how can I fix it?

On my scene, I have bean used portal lights for each window, and HDRi image for the lights and this render is done with 20.000 samples, and still I have noise.

I've been searching a way to remove this so I've tried some advice from 7 Ways to Get Rid of Fireflies Once and For All and nothing works for me.

Afters this I found out that the responsible for these fireflies is my Substance Painter node, removing that node and putting just a simple node like Diffuse on his place and everything will be fine.

enter image description here

Do you have any idea what should I do to solve this problem? Thanks

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    $\begingroup$ Maybe this question is relevant. $\endgroup$
    – sambler
    Commented Feb 22, 2017 at 2:08
  • $\begingroup$ When you say that you rendered with 20.000 sampling, did you mean twenty (20) or twenty thousand (20,000) $\endgroup$
    – Tovin
    Commented Feb 22, 2017 at 14:26
  • $\begingroup$ What is your material setup on the windows? The Glass BDSF shader produces very noisy results for light passing through it. Try using a Transparent BDSF Shader instead. $\endgroup$
    – BlenderBro
    Commented Apr 4, 2017 at 9:41

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Really good question Duarte! This is a common problem that I have faced many times. There is a despekle node built into the Blender compositor, as well as other third party softwares that can help you with this. Try rendering with a higher sample count. 20 is very low. GIMP is a free image editing software that you can use to remove fireflies, as I have many times! Video tutorial on removing fireflies in blender - Remove noise in GIMP I have included an image below on how to get rid of fireflies in GIMP. Hope this helps you some! BeforeDuringAfter

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  • $\begingroup$ "Try rendering with a higher sample count. 20 is very low", I've render this scene with 20k not 20 xD $\endgroup$
    – Mircea
    Commented Feb 22, 2017 at 12:40
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    $\begingroup$ Ah. I see. You should probably say 20k or 20,000 instead of 20.000 $\endgroup$
    – Tovin
    Commented Feb 22, 2017 at 14:27

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