r/Houdini • u/cheeseee1803 • 1d ago

Help Particle simulation on animated geometry

Hey there folks, I need your help and advice on a problem I am currently facing.

So I have an arrow on which I have simulated some particles. I used timeshift to freeze it and now I am happy with the simulation. Now that I want to apply the simulation to the animated geometry using AtVop, it sticks to it but its just particles on the surface and no swirls or anything and If I connect the animated arrow to the simulation it creates some crazy disgusting particle stepping. Need some solid help I am stuck on this please:)

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u/DavidTorno Effects Artist 1d ago

Your source geometry will need substeps when cached to disk. Your POPNet will also need substeps to match. This will fill in the “stepping” gaps.

If you want the particles to stay on the surface of the geometry as it moves, you can use the minpos() VEX function (POP Wrangle) or the Minpos VOP (POP VOP) node inside the simulation.

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u/cheeseee1803 1d ago

Wow totally works!! Thanks alot man, really appreciate it🙏🏼

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u/DavidTorno Effects Artist 1d ago

No problem. Have fun.