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I've carved out a minimal example of the poor performance we've been seeing in the contact modeling with the robotiq gripper. I thought it was specific to SAP, but i've included two models here: one with SAP + coupler constraints, and another with TAMSI + bushing elements. Both exhibit massive chattering in contact force directions. The problem persists even if the timestep is reduced considerably.
The reproduction is in this notebook. (I can't upload the ipynb directly)
It should be trivial to switch in the second model (the last cell of the notebook) if you want to look more closely at that one, too. I still recommend running this notebook first.
It seems to me that this is more of a model issue than a solver issue. The collision geometry of the finger tip is messed up. One of the finger tip is modeled as a matrix of tiny spheres for point collision and the other finger tip is modeled as a box, all using point contact. The jittering is likely caused by the well-known point contact issue between two box faces.
What happened?
I've carved out a minimal example of the poor performance we've been seeing in the contact modeling with the robotiq gripper. I thought it was specific to SAP, but i've included two models here: one with SAP + coupler constraints, and another with TAMSI + bushing elements. Both exhibit massive chattering in contact force directions. The problem persists even if the timestep is reduced considerably.
The reproduction is in this notebook. (I can't upload the ipynb directly)
You can view the behavior in this meshcat recording.
Version
master
What operating system are you using?
Ubuntu 22.04
What installation option are you using?
compiled from source code using Bazel
Relevant log output
No response
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