Static Object Collision Side

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I need to have a static collision object to only have collisions on the backface.

I have a solid object that I need flip particles to enter, bit not be able to leave.

Any ideas?
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Odforce, the 2nd home for Houdini users recently had an interesting thread about this. under effects.
Flip pouring into closed container.

[forums.odforce.net]
Edited by EZiniT - 2024年6月24日 17:01:56
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Found it, thanks.

Looks like the only project posted that works uses a bit of a hack, using time to change the emitters.
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