Where can I set or modify sol_params for contacts?

[gleitn96]

Hi team,

While inspecting the contact handling in the Genesis codebase, I noticed that each contact has associated sol_params, which seem to influence the contact force calculation (e.g., stiffness, damping, restitution, etc.).
Currently, it looks like the sol_params for each geometry are averaged when a contact is created:

impact.sol_params = 0.5 * (ga_info.sol_params + gb_info.sol_params)

However, I wasn't able to find where ga_info.sol_params and gb_info.sol_params are initially set.
Could you please point me to:

Where the default sol_params values are assigned for geometries?

Whether there is a way to customize sol_params per object or material?

If not, what would be the best place to modify them before simulation starts?

My goal is to study how different stiffness and damping values affect the contact forces during simulation.

Thanks a lot in advance!

[lankoestee]

Hello, have you found how to set these sol_params respectively?

Thanks!

[gleitn96]

Unfortunately, I haven’t found a solution yet. I closed this discussion because a similar topic is already open where I asked the same question again hoping to get an answer.