Another question of FDK

In FDK template of Hip. The F is calculated according to stiffness of spring element. I am confused that how to define the stiffness of different materials.
For example, if i want to use metal cup to metal head, how to define the stiffness? And what’s the meaning of InverseDynamics.ForceDepKin.Perturbation and InverseDynamics.ForceDepKin.LocalSearchOnOff ? Thanks a lot!:slight_smile:

The force is calculated using the surface contact, not a spring.

please also look at the Reference Manual at: