I was messing around a bit with Blender 2.79, and what i found was when i was doing smoke simulations, the renders turned out really grainy with a lot of noise (kind of like scattered pixels around the smoke) in the simulation its self. I never really came across this problem till now, maybe there's something that I'm missing? I attached an image below, I hope you know what I'm talking about. :)

Annoying noise enter image description here



Okay, so i found the problem i had if anyone interested... it had to do with my lighting. i guess for smoke simulations you cant use planes with a emmision node property. i had to use actual lamps or sun lights to avoid noise, but i still cant get it around my head how that works.


  • $\begingroup$ Lamps are generally much more efficient that using emission meshes, resulting in the need for much fewer samples to render the noise out of the scene. See blender.stackexchange.com/a/89665/29586 for a comparison - the same would be true for rendering a volume (smoke). $\endgroup$ Sep 29 '18 at 6:52
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    $\begingroup$ Thanks for the comment! you're right, once I dug a bit deeper emission meshes are really only at their full potential on scene lighting. Thanks! $\endgroup$ Oct 1 '18 at 6:29

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