Forums Technical Discussion Animating Vellum weld constraints breakthreshold

Animating Vellum weld constraints breakthreshold

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Emil Rasmussen
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4 posts
Joined: 9月 2019
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Hi, does anyone know why this wont work?

I want to animate the breakthreshold of my vellum weld constraints, so that the balloon pops at a specified frame.

So i thought, easy, lets dive inside the solver and animate the constraint, but it doesnt seem to work at all.

I animated the threshold to go from 100 to 0.001 on frame 25, but it doesnt seem affected by it. Only seems to be affected by whatever breakthreshold i set in the vellum constraint SOP

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Screenshot 2025-10-16 165301.png (824.2 KB)
Screenshot 2025-10-16 165530.png (48.2 KB)
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Screenshot 2025-10-16 165555.png (49.2 KB)

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FedorK_FX
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Joined: 1月 2016
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Vellum Welds that attach points together aren't true constraint primitives, it's just a bunch of attributes on the Vellum Geometry, so break threshold should be modified on the Geometry data, not ConstraintGeometry.
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Emil Rasmussen
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4 posts
Joined: 9月 2019
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Thank you.

I was wondering why i wasn't seeing any breakthreshold attribute on the constraintgeo.
So it's actually just a regular point attribute on the geo..
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tamte
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Joined: 7月 2007
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you can also set @weld to -1 in case you want to un-weld some points immediately or in a specific art-directed way
Edited by tamte - 2025年10月16日 14:10:23
Tomas Slancik
CG Supervisor
Framestore, NY
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