Changing muscle properties will not change the output from the Inverse Dynamics Tool. You may wish to read the "Overview of OpenSim Workflows" page in the User's Guide ( https://opensimconfluence.atlassian.net/wiki/spaces/OpenSim/pages/53084226/Overview+of+OpenSim+Workflows ) to determine which Open...

Please see the "Upgrade Notes for OpenSim 4.0" page in the User's Guide ( https://opensimconfluence.atlassian.net/wiki/spaces/OpenSim/pages/53084502/Upgrade+Notes+for+OpenSim+4.0 ). The bullet beginning with "If you are using models with CustomJoints" provides some information about this situation. ...

You could read through the gui repo on GitHub to dig up the syntax but I don't think it's straightforward. The "sum only" checkbox sets a flag that gets processed in JPlotterPanel.java (starting at line 1130, https://github.com/opensim-org/opensim-gui/blob/main/Gui/opensim/plotter/src/org/opensim/pl...

As stated in the answer above, the muscle models do not account for muscle mass directly: the mass of the muscles would be lumped into the mass of the body segment. However, if the mass of a muscle were to increase due to strength training, for example, that would also increase the muscle's maximum ...

Please see the "Motion (.mot) Files" page in the User's Guide ( https://opensimconfluence.atlassian.net/wiki/spaces/OpenSim/pages/53089415/Motion+.mot+Files ) for details about the requirements of the .mot file format. You can preview the data to ensure the file is being read correctly; please see t...

Perhaps the VS debugger can help identify the issue? Please see https://learn.microsoft.com/en-us/answe ... -exception.

The "build_simple_arm_model.py" example is similar to the "OpenSim API Example" here (with C++, Python, and Matlab versions): https://github.com/opensim-org/opensim- ... PI-Example.

If CMC starts but doesn't run to completion, the issue may be due to the accumulation of numerical/tracking error. Loading the partial results file and playing the motion or plotting the coordinates may reveal an obvious deviation from the tracked motion. In this case, adjusting the tracking tasks a...

You can run a MuscleAnalysis in the GUI or in Python ( https://opensimconfluence.atlassian.net/wiki/spaces/OpenSim/pages/53088479/How+to+Use+the+Analysis+Tool , https://simtk.org/api_docs/opensim/api_docs/classOpenSim_1_1MuscleAnalysis.html ) which will generate a file containing the fiber force for...

Does this mean that P=C (see image B) for this joint? Yes. This is true for most joints, a notable exception being the knee in models like gait2392 (which is defined as a CustomJoint with nonzero translations between the origins of the parent and child frames). It might be helpful to visualize the ...