When rendering smoke/fire simulations with cycles I sometimes get some random lines/artifacts on my render. Do you have any idea what might be causing this?

There are also some issues with transparency, but luckily they are not too noticeable.

Fire Artifacts

Here are my rendering settings:

Render Settings

I'm using 2.77 rc2 and tried both CPU/CUDA. I've had similar artifacts with previous versions and CPU rendering.


I've discovered that the issue is caused by Smoke High Res:

no highres


  • $\begingroup$ Not using any compositing effects, are you? $\endgroup$
    – Cubit
    Mar 11, 2016 at 14:27
  • $\begingroup$ Compositor is disabled here. Of course I found the culprit directly after posting :/ $\endgroup$
    – DeinFreund
    Mar 11, 2016 at 14:36

1 Answer 1


The issue is caused by Smoke High Res. It was fixed by applying the scale of the smoke domain (Ctrl+A)


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