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I have a short 120 frame animation that contains a smoke simulation which uses 2 collision objects. It has a large bake file so I want to render just the smoke on my pc while the animation without the smoke is rendering on a render farm, then be able to just composite the smoke back on top of the animation afterwards. What kind of layers or render passes should I set up for the smoke render? Thanks for any help!

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    $\begingroup$ I don't think this is possible. The main reason is that smoke is a volumetric object, meaning that light can enter it and scatter around before bouncing out. That means in order for it to look correct you need to render it with the rest of the scene so the lighting is accurate. $\endgroup$ – Eric Xue Jul 29 '20 at 17:29

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