Hi Ekaterina, Try the following to get XYZ locations of the origin state = model.initSystem() muscle0 = model.getMuscles().get(0) origin_x = muscle0.getGeometryPath().getCurrentPath(state).get(0).getLocation(state).get(0) origin_y = muscle0.getGeometryPath().getCurrentPath(state).get(0).getLocation(...

Hi Andy, I think your error could likely be due to using Python 3.9. I've been able to get it set up for Python 3.8, but the same steps don't work with Python 3.9 or 3.10. Here's step-by-step proces of what I did to get it working using OpenSim 4.3 and Python 3.8 in case if it helps anyone (using th...

Hi Nick,

Thanks for the reply and update. Unfortunately, the Wu model doesn't allow for free scapular motion. Looking forward to when the Scapulothoracic joint will be supported by Moco in a future update -- happy to test things out if needed.

Take care.

Dan

Hi Moco Team, I attempted to run Moco on Ajay Seth's thoracoscapular model to predict scapular + humeral kinematics for an arm elevation motion but didn't realize that ScapulothoraicJoints aren't supported yet in Moco and ran into error issue (generalized speeds don't match the derivative of the gen...

Hi Ayman,

Thanks for your quick response. I'll contact Ajay directly to figure out what may be happening.

Take care!

Dan

Hi all, I've noticed a big difference in inverse dynamics results between OpenSim 4.2 vs 4.0/4.1 using Ajay Seth et al.'s thoracoscapular model and was wondering why this may be happening. I know that the Scapulothoracic Joint is now built-in with OpenSim 4.2 as opposed to using a plug-in with previ...

Hi Yunus, I believe the bone file I was referring to was the bone geometry (.vtp) file, which come with many of the models available on OpenSim. Here's a link that has some details, specifically " Q. What are .vtp, .stl, .obj files? ": https://simtk-confluence.stanford.edu/display/OpenSim/Frequently...

Thanks Christopher!

Is there a way through Matlab and the API to output the vector components (Fx, Fy, Fz) of a muscle? Or alternatively, its direction cosines?

Thank you!

Dan

Figured out a workaround from using the API functions for those who might encounter a similar issue -- can edit the .osim file before importing the model by using the "fopen" function in Matlab and changing the exact line that's needed and saving that to file.

Dan

Hi everyone,

Is there a quick way to change the origin and insertion attachments of a muscle in Matlab and have OpenSim re-calculate/update its Path around a wrapping object? I tried using the "replacePathPoint" function but it doesn't have an input for specifying the new position.

Thank you!

Dan