Vellum Grain: kill particles below height?

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olivierth: Member; 1177 posts; Joined: April 2017; Offline

Sept. 25, 2024 3:03 p.m.

Hi!

I'm starting to learn Vellum Grain and I would like to know how to kill or freeze partciles that goes below a certain height. My collision ground is not very wide causing many particles to spill to the sides (out of camera view).

-Olviier


Tanto: Member; 542 posts; Joined: Nov. 2016; Offline

Sept. 25, 2024 3:42 p.m.

Hello! You can create a pop kill and plug it in the source output inside the Vellum solver. Then either use the bounding tab or the rule tab with

dead = @P.y < 0

or whatever your height is.


olivierth: Member; 1177 posts; Joined: April 2017; Offline

Sept. 25, 2024 4:40 p.m.

Hi Tanto!

hmm... when I dive inside the Vellum Solver, I can't create a "pop kill" node. In fact, I almost have not nodes I can create. Could it be because I'm using Houdini Core?

-Olivier


Tanto: Member; 542 posts; Joined: Nov. 2016; Offline

Sept. 25, 2024 5:14 p.m.

Yes, that is the reason unfortunately. To be honest I'm not too sure how you would do it in Core.


olivierth: Member; 1177 posts; Joined: April 2017; Offline

Sept. 26, 2024 4:34 p.m.

Ok, thanks for the info!

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