[RESOLVED] Deleting every points that never moved in a point cache

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Hi !
I'm currently working on a vellum grain simulation for snow. I need to export it to Maya for the rendering process! (our light rig and texturing is made on Maya)
So my idea was to separate my meshing in two parts:
• one will be particules that moved at least one time (the real “grains”) aka a dense meshing to get grains almost individually
• the other will be the particles that didnt move/are less important aka lighter meshing to get the shape of the grains.
in these way, for big scenes, I'll have a two alembic low & high, instead of one very heavy alembic file.
Problem is : I can't seems to find a way to separate the two of them.
I saved my simulation (cache) with P and V , and wanted to create a group that'll update at every frames to put the new points that moved in it. Unfortunately: Houdini is overiding the group, like it's creating a new one for every frame.
Any idea what I can do ?
Thank you so much,
Marine

Edited by Marinc - June 1, 2020 16:50:57

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POURHOUDINI.JPG (261.6 KB)

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Resolved !
I have two timeshift on freeze (first & last frame of the simulation) and we compare p value of the two via a point wrangle (with a threeshold to get a better falloff! ) Working like a charm !
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