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art3mis

Strange Bullet Solver Motion

Hi

Encountering some strange Bullet Solver motion in a simulation.

Using the RBD Fractured Object shelf tool and a GroundPlane for collision. So the only force should be gravity. But after the fractured pieces hit the ground many of them continue to swim around as if affected by some sort of turbulence. And if I look under the ground plane I can see they actually pass right through creating a sort of debris cloud. Very strange

 

Can anyone suggest what might be happening?

strange_bulletSolver motion.gif

dopNetwork.png

thruP_groundPlane.gif

Edited by art3mis

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look at your substeps, increase them to default at least. (which is 10), Also make everything to the default, then start tweaking from there. 

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Thanks guys. Setting defaults helped a bit but the main problem was I needed to enable "Create Convex Hull..." on RBDPackedObject node. However there is still some type of collision issue. Almost as if the ground plane was water and the smaller fractured pieces are bobbin in the water.

bullet solver.gif

RBD_packedObject.png

Edited by art3mis

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so is substeps a bit higher than 1 now ? also do you HAVE to use parallel constraint solver ? my (pure) guess is you're using parallel constraint solver....with artificially high gravity + substeps 1....leads to artifacts/swimming

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That definitely looks suspect. Can you upload the file or even a simplified version with the problem?

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