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velocity based on normal


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I'm trying to have my particle velocity follow the normal of a geometry.

like a hose or a water cannon. I'm creating a grid and emitting particles from it, but when I set the velocity in the popnetwork's source, the particle just shoot up and don't change if I rotate the grid.

I guess I need to connect the velocity with the normal, but no idea where or how to do it.

any help would be appreciated.




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