We're a small studio using Blender for VFX work. I have a large simulation of a building on fire and noticed that the smoke is banding in the upper left corner as seen in the attached picture. The bake alone took 3 days, so I would like to avoid re-baking if possible. Does anyone know if there is a render setting that might fix this? banding


You can try the Cubic volume interpolation method and Distance sampling. Settings supported on CPU only:

enter image description here

Distance sampling: Best for dense volumes with lights far away.

Cubic: Smoothed high quality interpolation, but slower.

Linear vs Cubic:

enter image description here

GPU support for Cubic interpolation is added in 2.8 version:

Commit 2d92988f6bc4 & f61c340bc15e: CUDA and OpenCL rendering support for cubic interpolation with images and volumes.

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  • $\begingroup$ I just tried switch to CPU and making sure those settings were enabled. Unfortunately it's still doing the same thing. Would it have something to do with baking with the adaptive domain turned on? $\endgroup$ – Chris Tempel Aug 6 '18 at 22:42
  • $\begingroup$ @ChrisTempel no, adaptive is not the problem. Your simulation is low resolution and only the cubic interpolation will save you (it smoothes it). Try it in blank file on some low res dense smoke if it works. $\endgroup$ – Jaroslav Jerryno Novotny Aug 6 '18 at 23:52
  • $\begingroup$ @ChrisTempel it is weird that you don't see a render difference, can you upload 1 frame of the smoke for testing? $\endgroup$ – Jaroslav Jerryno Novotny Aug 7 '18 at 0:01
  • $\begingroup$ @ChrisTempel another thing to consider to achieve better quality in reasonable time is to buy a commercial simulation software that can simulate well multithreaded and with openCL acceleration. Depends how much 3 days are worth to you, but Houdini Indie is $270 (this can render up to 4k resolution). $\endgroup$ – Jaroslav Jerryno Novotny Aug 7 '18 at 0:08
  • $\begingroup$ Yeah, we're considering Houdini. Aside from this, Blender also has been deleting all our bake files, even if the sim isn't done baking. We have to back them up which sucks when they are averaging 1GB a frame. $\endgroup$ – Chris Tempel Aug 7 '18 at 22:13

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