Hi, you need a tracking task for every free coordinate. The issue might also be your actuator file. Similarly, in RRA you need a strong coordinate actuator for every free coordinate, but weak residual actuator for pelvis coordinates.
(weld and locked coordinates must be excluded)

Hope this helps.

Hi, the hip joint center is located in the center of the femoral head. This is also the origin of the femur geometry. So, just create a new marker, change the frame to femur_r and set the location to zero: Hope this helps.

Hi, I just tested IAA using the dataset and setup files available here (https://simtk.org/projects/nmbl_running). I confirm that after loading the setup file in the GUI, both socket_rolling_body and socket_surface_body fields are empty (the tool doesn't get those parameters from the XML file), and t...

Hi, I just tested your minimum working example in IPython console (py10, osim4.5.1), and it works. Your motion seems to be a static pose, and I think that's why you set the final time to zero as well. The warnings suggest that the motion file doesn't contain all coordinates. Some people have reporte...

Hi, if I understand correctly, you are asking about whether the pipeline is ok when there is only one force plate.
Yes, that's totally fine, and the outputs of ID, SO, and JR of the leg the GRF has been applied to are still valid.
Hope this helps.

Hi, you can rotate/translate the model through pelvis coordinates (some adjustments in range of motion or unclamping the coordinates might be required): https://opensimconfluence.atlassian.net/wiki/spaces/OpenSim/pages/53089256/Coordinate+Controls+and+Poses#CoordinateControlsandPoses-CoordinateContr...

Hi, it might be out of the scope of this post; you can also get angular momentum through OutputReporter.
An example in GUI can be found here: https://opensimconfluence.atlassian.net ... Simulation

Thanks a lot for the correction. I wonder why there is no corrigendum for that paper.

Hi, the following paper and the MATLAB example might help: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4404026/ https://github.com/opensim-org/opensim-core/blob/main/Bindings/Java/Matlab/examples/plotMuscleFLCurves.m You can also search for MomentArmSolver and the relevant methods in the source cod...

Hi, you might need to add a MocoContactTrackingGoal to your problem. An example can be found in the example2DWalking.