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macj89

Deleting Pyro sections after cache.

Hi there houdini masters!

Lets say Ive got a Pyro volume in .bgeo and I want to subtract sections of the volume, to be more specific, the center of the sim and keeping the borders, so a bounding box like the one made by Delete SOP would do the thing.

I've tried using Delete, Volume Mix (that only removes a portion of the volume), etc.

Is there any trick that could do the thing? Maybe something at render time?

Cheers and thank you in advance!!! 

 

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So you tried the volume mix and it does not work for you? Sounds exactly the way to go. At least it works fine with simple volumes.

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Yeah, im quite newbie in smoke things, what would be the approach for the volume mix? I did a cube, sourced a smoke from it, cached and tried to substract it from my sim with the volume mix subtract. Tried so many settings but still not working, I'll try it in a dummie simulation before going into my huge complex one! hahah Good to know that Volume Mix is the path, i wasnt that wrong!

 

Cheers!

Edited by macj89

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Gonna add some images, its a simpler main sim to iterate.

You can see the Cube, the mainSim and the mixed sims

 

cube.PNG

mainSim.PNG

mix.PNG

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I also tried converting both volumes into vdb and doing a vdb comine without any succes, i'll keep playing, let's see if i get with the solution! Thanks

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volume mix should work but in your smoke sim the density value may go above 1.0.

make sure your box has more density than your smoke sim.

you can use Post-Add/Mult in volume mix to add density to the box.

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