Hi everyone. I am trying to solve a problem where I need to calculate Angular velocities in local frames. I just realized that pelvis's orientation can affect it's local angular velocities which does not make sense to me. Please take a look at thesimplified MATLAB script. In this case my model has 1...

Thanks James, yes it solved the problem.
For anyone else who may have the same issue: this is the default path for windows users: c:\OpenSim4.0\Geometry\

I have recently installed OpenSim4.0 andconverted my osim files and I can open them in GUi, but whenever I run my matlab api scripts it says it cannot find any of my vtp files. I know it will not effect my calculations but it's annoying as it keeps printing on command window whenever I load a model ...

Was wondering if it's any methods available in MATLAB API to calculate velocity of a body in the global frame? I think you're looking for the getVelocityInGround() method, which is inherited from the Frame class ( https://simtk.org/api_docs/opensim/api_docs/classOpenSim_1_1Frame.html#a74bf6788630d1...

Depends on what version of OpenSim you want to use. I would recommend using the 4.0 Beta API since there are convenience methods added to do this. The below code would give you the position and orientation of the OpenSim body in the Global. import org.opensim.modeling.* model = Model('gait2392_thel...