1
$\begingroup$

Is it possible to render the fire and smoke (the same simulation), in Cycles, separately, for example as different passes?

$\endgroup$
1
$\begingroup$

Yes.

Just do it as you normally would. Select both the domain and the smoke emitter and change their "pass index".

(in the illustration, the sphere is your smoke domain. It also shows how to get it on another pass in the compositor.) enter image description here


Or you can change their layer, and render them on a different render layer.

$\endgroup$
  • 1
    $\begingroup$ Well, to the first part, no, they should have the same index. If you want the fire and smoke on different "layers", you put them on different passes. I believe that it goes by the domain, so you should only have to change the pass of the domain. However, if you have the smoke and fire both being input to the same domain object, there is no way I know of to render them on different layers. You must create two different domain objects, and change one of them to pass index one. $\endgroup$ – Uncle Snail Feb 17 '16 at 22:41
  • 1
    $\begingroup$ (the fire can be left at 0, because everything starts at 0, and the smoke is now at 1, but if you want it to be seperate from other stuff in scene, you need it to be 2.) $\endgroup$ – Uncle Snail Feb 17 '16 at 22:41
  • 1
    $\begingroup$ About your second comment, if you are simply rendering them out to images, you can input the image sequence to the compositor and then not bother with much of that. If you want the fire to affect the smoke (for example, light it up so that where the fire is, the light is shed on the smoke, and not simply ignored), you are better off not using the render layers method, but object indexes, as render layers interacting is impractical, and you must duplicate objects just to cast lights and shadows to get interactions without seeing the objects. $\endgroup$ – Uncle Snail Feb 17 '16 at 22:43
  • 1
    $\begingroup$ Also keep in mind that if you are using "fire and smoke" setting in one smoke domain, it will be more difficult to do this. You should create two domains, and use one as smoke, and another as fire. (and in the material for the "fire", remove all the smoke parts, because fire automatically comes with smoke in the smoke sim [who knew right, I thought that's what fire+smoke was for :P]) $\endgroup$ – Uncle Snail Feb 17 '16 at 22:45
  • 1
    $\begingroup$ Sure, you can ask another question here in comments, but if you want, you can create a new question. If it is very similar to this question, you should post it here, but if it is an entirely different question, you should create a new question, then comment here asking me to answer (if you want) (also give the link please). (So you can bookmark this page if you want, so you can get to it later [that's what I do]) $\endgroup$ – Uncle Snail Feb 17 '16 at 22:54

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.