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ehsan parizi

fluid smoke dissipation?

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Hi,

Does anyone know how I can control the dissipation of the fluid smoke?

It looks like it never dies right now, the other thing is when an emitter disappears, seems like the density that has been created becomes a new emitter and it keeps emitting smoke(in the attached file).

smoke.hipnc

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Hi,

you could connect a gasDissipate node to the fourth input of your smokesolver and set the evaporationRate parameter to something like 0.9

Cheers,

Emanuele

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Thanks Emanuele :)

A little late but:

Gas Diffuse and Gas Calculate. Gas Diffuse will spread your gas around the container, eventually thinning it out to nothing. Gas Calculate will allow you to apply a multiplier to the density to fade the smoke out over time.

Both should be hooked up to the "sequel solvers" input (fourth) of your smoke solver - won't work otherwise. You can use a multisolver node to have both of them hooked up simultaneously.

Gas Calculate:

Set source/dest field to "density". Lower the "Post Mult" (many of the other mults will work, too) very slightly - say, 0.99.

Gas Diffuse:

Set the field to "density", give it a somewhat high (maybe 10) diffuse rate, so you can visualize its effect.

Edited by Nik S
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A little late but:

Gas Diffuse and Gas Calculate. Gas Diffuse will spread your gas around the container, eventually thinning it out to nothing. Gas Calculate will allow you to apply a multiplier to the density to fade the smoke out over time.

Both should be hooked up to the "sequel solvers" input (fourth) of your smoke solver - won't work otherwise. You can use a multisolver node to have both of them hooked up simultaneously.

Gas Calculate:

Set source/dest field to "density". Lower the "Post Mult" (many of the other mults will work, too) very slightly - say, 0.99.

Gas Diffuse:

Set the field to "density", give it a somewhat high (maybe 10) diffuse rate, so you can visualize its effect.

Thanks Nik,

:)

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when turn on diffuse,the blurred volume would loss some details,how to render motion blur for pyro or smoke?

Well yah, when the fluid diffuses (from a gas diffuse) around the container it loses detail because it is diffusing into the air... Want to keep detail in your simulation? Don't diffuse it... :blink:

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Like Emanuele said, try gasdissipate and evaporate by subtraction. It will remove a constant at each timestep. You can also use a gas field vop and do it manually and have finer control over what's happening.

Edited by Macha

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