Vellum Cloth: Un-intersect 2 surfaces?

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Hi!

I've got two leaves. One is animated to go downward through the other leaf. I would like to use vellum to avoid intersections. How?

I Tried using the Vellum Constraints set to Pin to Target so it matches the animation but the leaves still goes through each other as if there was no simulation at all...

EDIT: I would like to do the same as in this presentation:
https://youtu.be/k9i_PqjnQds?si=lpj5sdtdybkslVbw&t=1548 [youtu.be]
Edited by olivierth - May 7, 2026 11:11:51

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Houdini_Vellum_deIntersect_leaves_01.jpg (113.7 KB)

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you want to set Pin Type to Soft, not Permanent, since when all points are pinned as permanent they are not going to budge

and maybe decrease the pin stiffness a bit
depending on the look you are going for it may be better to keep roots of the leaves pinned with higher stiffness and tips with lower or none, so that the colliding parts don't try too hard to push past the collisions

Orientation Pin Type doesn't matter for the cloth
Edited by tamte - May 7, 2026 12:41:04
Tomas Slancik
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Thanks for the reply!

I was looking for the "pin stiffness" setting and could not find it. I'm guessing you meant the strech stiffness? I increased it and not it seems to work!

Thanks again, tamte!

-Olivier
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olivierth
I was looking for the "pin stiffness" setting and could not find it. I'm guessing you meant the strech stiffness? I increased it and not it seems to work!
yes, stretch stiffness for the Pin constraint, you don't want it too high, that's why I mentioned decreasing, but you still may want it reasonably high for areas that need to follow your animation fully, so usually controlling it with attribute works well

if you are just deintersecting you may want to also set Velocity Damping to 1 on the solver
Tomas Slancik
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Framestore, NY
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