Hey Mohsen, Before realizing to the position stage you need to set the states (coordinates in this case) for each time frame, currently you are only extracting them from your *.mot file. Take a look at the following methods: https://simtk.org/api_docs/opensim/api_docs/classOpenSim_1_1Component.html#...

Hello Kardelen, To set the state variables for a coordinate you would do something as follows (roughly): model = Model(); state = model.initSystem(); X = [1 0]; % getting the 0th coordinate in the model, setting its value and speed model.getCoordinateSet.get(0).setValue(state,X(1)); model.getCoordin...

Hey Musa,

I think before: you need to include: Hopefully that works!

Nicos

Hello Alexander, Here are a couple of articles that fairly recently touched upon the points you raised in your post (hopefully they help!): [1] https://link.springer.com/article/10.1007/s11044-021-09808-7 [2] https://www.sciencedirect.com/science/article/abs/pii/S0021929024003087 [3] https://link.sp...

Hello Kardelen, What are you exactly trying to do? You want to apply a force with a controller to a rigid body and move it along a particular coordinate? Have you tried looking at the C++ examples for optimizing the controls of the arm_26.osim model? You could potentially also take some inspiration ...

Hello Huhu, How are you calculating the coordinate speeds when you manually try to calculate muscle forces? Perhaps differences between your coordinate speeds and those calculated by the static optimization tool differ (impacting the force-velocity multiplier) which may explain the differences you o...

Hello Mahshida,

Have you tried previewing your experimental marker data to see if it is as you expect?

Thanks,

Nicos

Hello Mohammadreza,

Would you mind sharing the files you used to generate these results?

Thanks,

Nicos

Hello Madeline,

The model documentation can be found here: https://opensimconfluence.atlassian.net ... 354+Models

and the associated publication:
https://ieeexplore.ieee.org/document/102791

Hope that helps!

Nicos

Hello Christopher, I am not 100% sure there is a model out there that attempts to model each joint with the level of detail you are describing. Researchers typically increase the complexity based on the research question. So if you are interested in the small movements between the patella and the fe...