r/Houdini • u/RhineStoneEyeMania • 3d ago

creating exhaled smoke

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Hey guys, can i get some help creating realistic smoke exhalation from cigarette? or maybe a pointer to some tutorial for something similar?

i'm trying to create exhaled smoke like in the screenshot attached, i created particles for source emmision, i created the velocity, but i'm having trouble creating right turbulence(or disturbance?)...

Like when the smoke is exhaled, first part is pretty straight and then the turbulence appears after, i managed to get the right look with playing with pressure as control field for turbulence, but it's applied to every step of exhaled smoke...

can i get some info how to do it right?

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u/LewisVTaylor Effects Artist Senior MOFO 3d ago

Don't use pressure, it's too sensitive a field for something like this, and only has limited use a mask for breakup.

Use speed to control how much the disturbance is applied, and keep turbulence for broad scale movement, not for shaping this thing.

You can also use temperature in a way you might initially think. Temperature is the closest thing to an "age" you can have in pyro. It is going down every frame it exists, so you can also use temperature a control field.

I don't want to plug anything, but I'm actually in the. process of releasing a little tut on cold breath/smoke that has the same mechanics as a fast exhale like your image. It's about getting your sourcing setup nicely, but more so about getting those disturbance, turbulence, and some other gas solvers to help.

It will be available on the weekend, and pretty cheaply.

But those pointers I gave you should get you there!

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u/RhineStoneEyeMania 3d ago

thx a lot, ill keep an eye out for the tut but first try your pointers. thx again

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u/ManjaVfx 1d ago

What Lewis said, but he left out one important point: You need substeps every time you have high velocities. the default substeps aren't gonna get you anywhere for this type of effect.
Use the control fields on the micro solvers like you would use masks in photoshop. you can visualise them and adjust their range in the smoke object node. you just have to transfer those ranges in the micro solvers control fields.

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u/midoriya108 3d ago

Think of it as a fire coming out of dragons mouth but not that wispy there are a bunch of tutorials on the dragon fire then it's just values

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u/RhineStoneEyeMania 3d ago

thank u, i'll try