Static optimization uses a least-squares approach because there are more actuators than degrees of freedom (see https://opensimconfluence.atlassian.net/wiki/spaces/OpenSim/pages/53089619/How+Static+Optimization+Works). The equations there don't quite capture what the reserve actuators are contributi...

The citations from that GitHub page include a reference for Seth et al. and the Scapulothoracic joint, and the ScapulothoracicJoint was added in OpenSim 4.2 (https://opensimconfluence.atlassian.net ... penSim+4.2).

Please refer to the discussion in this previous post: viewtopicPhpbb.php?f=2385&t=17594&p=49369&start=0&view=

In particular, the link to the OpenCap GitHub folder for OpenSimAD has great information in the README file.

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Please see the example Simulation-Based Design to Reduce Metabolic Cost for an example.

It looks like the maximum force/moment that your reserve actuators can produce might be very small. The total force/moment is determined by (control value) * (reserve actuator force value). So, these actuators are generating 1 N or 1 N-m (depending on if it's a linear coordinate or a rotational coor...

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