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object scale change, durring rbd sim

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Hello, Houdini folks!

I have a question about very essential thing durring the rbd simulation. (Im attaching the file here). What I have, I want to change the scale of the pighead, durring the simulation, but without this "strange jumping" behaviour. Any suggestions, how to solve?

Thank you so much.



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Hi Michal,
you are scaling the object, but at the same time, you are translating it (because of the pivot of the scale). This is the main reason for the unusual behavior. Set the translate in testgeometry_pighead1 to 0,0,0 and set the translate in transform1 to 0,5,0. Then you could also increase the substeps of the dopnet and/or the bullet solver.

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