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Why are contacts so unstable?

asked 2015-11-21 01:02:38 -0500

soshiant1992 gravatar image

updated 2015-11-30 03:01:37 -0500

SL Remy gravatar image

I use this gz topic to get contact data /gazebo/default/physics/contacts and I'm try to get a center of pressure, but it turns out like something in this pic sss.jpg

I also uploaded a vid for showing how contacts are shaky.

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Thats how contacts look for me as well under ODE. I think with bullet I used to get stable contacts, however other issues appeared, maybe it works for you.

AndreiHaidu gravatar imageAndreiHaidu ( 2015-11-25 08:43:41 -0500 )edit

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answered 2015-11-25 11:57:22 -0500

hsu gravatar image

updated 2015-11-25 14:06:34 -0500

There are a few parameters you can use to stabilize contacts. There are many factors that affect contact stability, some come from your robot controller and some from the physics engines.

See for example this world:

Or the drcsim example.

We can take this offline (by creating an issue). Best case scenario is that your model or some subset of your model that demonstrates the unstable-ness is added to our integration test suite as an example of how to create stable contacts for future simulation modelers to follow.


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Asked: 2015-11-21 01:02:38 -0500

Seen: 1,538 times

Last updated: Nov 30 '15