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I have a questions about smoke:
1) Is it possible to make smoke from a certain smoke flow invisible, i.e. not rendering it at all?
2) Is it possible to get smoke data per smoke flow, not entire domain?

wasd wrote: ↑Tue May 14, 2019 7:23 am I have a questions about smoke:
1) Is it possible to make smoke from a certain smoke flow invisible, i.e. not rendering it at all?

What is exactly the mean of "smoke flow" ?

You can make it totally transparent: 0.0 scattering and absorption.

wasd wrote: ↑Tue May 14, 2019 7:23 am 2) Is it possible to get smoke data per smoke flow, not entire domain?

See the question above.

This would require some kind of ID grid (which does not exist). Or it would be necessary to save the smoke of different flows to different grids, but I think this is not possible in Blender - everything is baked into the same grid.

What you could try is using a distinct color channel for each flow (R, G or B) and mask them by using the new "split RGB" texture in the latest daily builds.

@Dade: A smoke flow in Blender is an object that emits/generates smoke.

Dade wrote: ↑Tue May 14, 2019 10:20 am

wasd wrote: ↑Tue May 14, 2019 7:23 am I have a questions about smoke:
1) Is it possible to make smoke from a certain smoke flow invisible, i.e. not rendering it at all?

What is exactly the mean of "smoke flow" ?

You can make it totally transparent: 0.0 scattering and absorption.

Yep, I did something like that, though it's 1.0 for no absorption. It's not very convinient, hence the question.

B.Y.O.B. wrote: ↑Tue May 14, 2019 10:53 am This would require some kind of ID grid (which does not exist). Or it would be necessary to save the smoke of different flows to different grids, but I think this is not possible in Blender - everything is baked into the same grid.

What you could try is using a distinct color channel for each flow (R, G or B) and mask them by using the new "split RGB" texture in the latest daily builds.

It's not very nice of blender, then.
I'd try this split rgb. For now I colored "invisible" smoke black, and visible – white.
Also, there's "Use modifier during render" switch, but it seems it does nothing with smoke flow.

With a setup like this, you can create masks for up to three smoke flow objects: