There are a couple examples in the "Example 3: Neural control" section of this paper: Seth A, et al. OpenSim: Simulating musculoskeletal dynamics and neuromuscular control to study human and animal movement. PLOS Computational Biology, 14(7):e1006223, 2018. https://doi.org/10.1371/journal.pcbi.10062...

Please see Nick's replies to topic 18889: viewtopicPhpbb.php?f=91&t=18889

Some data can be found here: https://orthoload.com/. Data from this repository were used in the "Enhancing Accuracy and Reliability of Spinal Load Estimation in Lifting/Lowering" project (https://simtk.org/projects/handloadinterac), which may also contain some helpful models/data.

Two examples demonstrating batch processing can be found on GitHub in the Bindings/Java/Matlab/examples directory: - setupAndRunIKBatchExample.m ( https://github.com/opensim-org/opensim-core/blob/main/Bindings/Java/Matlab/examples/setupAndRunIKBatchExample.m ) - setupAndRunAnalyzeBatchExample.m ( ht...

There is one available here: https://simtk.org/projects/ulb_project.

A CustomJoint is created in Python at line 126 in test_swig_additional_interface.py here: https://github.com/opensim-org/opensim-core/blob/48154edea02008a36875f712e1893242d4f27b25/Bindings/Python/tests/test_swig_additional_interface.py#L126 . Note that a SpatialTransform ( https://simtk.org/api_docs...

The integrator step size must be sufficiently small to capture the highest-frequency content in the response. To use fixed steps, you would need to either modify the system so its response doesn't change more quickly than the integrator can capture, or accept lower tolerances in the solution. You co...

The method takes a reference. I don't know what your code looks like, but I'm guessing that you're passing in "opensim.VectorOfSpatialVec(size,osim.SpatialVec(osim.Vec3(0), osim.Vec3(0)))" as the third argument. If so, I would instead try assigning this to a variable on the line above and passing in...

The third argument of calcResidualForceIgnoringConstraints() is a Vector of SpatialVecs (doxygen: https://simtk.org/api_docs/simbody/3.5/classSimTK_1_1SimbodyMatterSubsystem.html#a9402191ff489fae227969ed43db05df0 ), which is bound to "VectorOfSpatialVec" in Python (see https://github.com/opensim-org...

If the integrator is being run with fixed time steps, then there is no guarantee that the solution will meet a desired tolerance. You may wish to switch to an integration strategy that uses variable time steps, particularly if the excitation is discontinuous. The integrator can then take more steps ...