Hello, I need a constraint that use two independent coordinates. According to the documentation, it is now only restricted to one coordinate. How can I extend this? If I wrote a child class that used two coordinates, how can I add it to the opensim GUI so that it is used in all analysis or optimisat...

In Millard2012EquilibriumMuscle, the FiberForceLengthCurve uses to strain factors to shape the passive force-length curve According to the documentation https://simtk.org/api_docs/opensim/api_docs/classOpenSim_1_1FiberForceLengthCurve.html#details strain = (l-l0)/l0, where l is the current fiber len...

Thanks a lot
It worked with the following lines together

realizePosition is not accessable from Model class

rjointCoordinateSet[1].setValue(si, convertDegreesToRadians(-32), true); cout << "Muscle Fiber Length at -32 Abduction" << endl; for (int i = 0; i < 6; i++) { cout << muscles ->getName() << " - "; cout << muscles ->getLength(si) << " - " << muscles ->getFiberLength(si) << " - " << muscles ->getTendo...

I am using the APIs to create my model and calculate muscle lengths at different positions of the model.

What does it mean when I use getTendonLength and get a -ve value?
How can a tendon be conpressed? What does that mean?
Can someone help me?

Thanks a lot for your answer.

I have already created classes to inherit these and tried to change this issue but the problem is beyond that.
Can you point me to the class that sends the coordinate values to the CompoundFunction class???

Thanks again

I need a coordinate constraint that takes 2 independent coordinates to calculate the dependent coordinate. I created a Function class that inherets OpenSim::Function that takes 2 values and returns the calculated value. But I couldn't create a class that works like the CoordinateCouplerConstraint bu...

What is the reason for pErr to be nan??
How can I fix it?

I can't find any Geometry directory in my opensim source code or intalled folder.
From where can I download vtp files or others for the models???