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Packed object moved center of mass


jonas.borgman

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Hey, i need to export animated objects via FBX after simulating them with rbd.

And one pickle i came across was that if i have all my pieces of debris all split up and all of them has one joint each put at the point of the packed primitive.

But as soon as the dop node kicks in (since it doesn't start on frame 0), the center of the objects gets moved.

 

I guess this has to do with the "Compute center of mass"

Can i force the center of mass to be the previous point position, and just not move it around?

It seems as though if i simply uncheck the tickbox all objects jumps down to origo, and i cant get any variables to work in the "pivot" attributes.

Or is there another way to pre calculate it to have the same position on the chunks before the dop node?

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not sure which version you are using, but this may be related

 

Tuesday, October 13, 2015
Houdini 14.0.485: Added an option to the RBD Packed Object DOP (enabled by default) to initialize the pivot with the packed primitive's point position. This is a more sensible initial state for the object, and makes initial angular velocities work as expected for typical workflows.

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