Hi Dimitar, Thanks for the reply. What I am trying to calculate is essentially a partial derivaties of MTU lengths over the unconstrained coordinates of the model. I've attached the code below where the getPointForceDirection() function is called. In the function iGenCoords is an array of indexes to...

Hi All, I'm trying to calculate a muscle Jacobian for an upper limb model and encountered an issue. In some states, certain muscles in the model would result in NaNs when calling getPointForceDirections() which in turn causes NaNs in my muscle Jacobian. Would someone be able to point me towards wher...

I'm trying to implement opensim for a real-time strength calculation and am currently stuck at trying to perform the inverse kinematics from the opensim api realtime. Would anyone have any idea as to what class or method that I could look into to perform this and what is required to be passed into t...