There was a recent PR that updated this import: https://github.com/stanfordnmbl/opencap-processing/pull/132/files The issue was that the import was deprecated and finally removed from SciPy, so we updated the import line in utils.py for the import. It should now work on current versions of SciPy (mo...

Your clear and simple test case is very helpful here! If you look at the code, there are negative signs when the stiffness and damping terms are calculated (https://github.com/opensim-org/opensim-core/blob/main/OpenSim/Simulation/Model/ExpressionBasedBushingForce.cpp#L278). This is probably why you ...

The ScaleTool is customizable so that you can place markers to represent the distances that you've measured in your own experiments. There is a tutorial, documentation pages, and a webinar that are helpful to learn more.

The simple Python example from the GitHub page could help guide using model.setUseVisualizer(): https://github.com/opensim-org/opensim- ... ple#python

The validation paper for OpenSense (which the IMU Inverse Kinematics tool uses), describes how they chose the filter gain for their experiments in the Methods section.

One thing I noticed in the project link is that the page was last updated in 2013. It could be good to either reach out to the authors to see if they have an updated version, or to use an older version of OpenSim (such as OpenSim 3.3, or maybe OpenSim 3.1 which was released in 2013), which you can f...

The webinar "Tips and Tricks for Data Collection, Scaling and Inverse Kinematics in OpenSim" could be helpful to review: https://www.youtube.com/watch?v=ZG7wzvQC6eU There is also written documentation for the tool provided on the documentation wiki: https://opensimconfluence.atlassian.net/wiki/space...

Whether these errors are acceptable or not will depend on your exact research question. For instance, if you are using one of the typical gait models, it's possible that the torso markers may not match well if the person is bending their spine during the motion (and the torso is one rigid body and c...

Changing the maximum isometric force is one way to model changes due to differences in muscle strength. It's one of the properties in an OpenSim model, and it can be derived from other muscle properties, such as muscle volume, optimal fiber length, specific tension, and pennation angle. A few resour...

This isn't available out of the box to my knowledge. The closest example I can think of is the reflex controller from the example Simulation-Based Design to Prevent Ankle Injuries . With some code, you could create a custom controller in a couple of ways: - In C++, make a new Controller that uses jo...