art3mis Posted August 13, 2017 Share Posted August 13, 2017 (edited) 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? Edited August 13, 2017 by art3mis Quote Link to comment Share on other sites More sharing options...
Sepu Posted August 13, 2017 Share Posted August 13, 2017 look at your substeps, increase them to default at least. (which is 10), Also make everything to the default, then start tweaking from there. Quote Link to comment Share on other sites More sharing options...
Noobini Posted August 13, 2017 Share Posted August 13, 2017 (edited) I'd say Scale/Pivot issues....here's how I 'imitated' it... Edited August 13, 2017 by Noobini Quote Link to comment Share on other sites More sharing options...
art3mis Posted August 13, 2017 Author Share Posted August 13, 2017 (edited) 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. Edited August 13, 2017 by art3mis Quote Link to comment Share on other sites More sharing options...
Noobini Posted August 13, 2017 Share Posted August 13, 2017 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 Quote Link to comment Share on other sites More sharing options...
rbowden Posted August 13, 2017 Share Posted August 13, 2017 That definitely looks suspect. Can you upload the file or even a simplified version with the problem? Quote Link to comment Share on other sites More sharing options...
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