Hi Samane,

For OpenSim 4.1 on Ubuntu, you might need to update the LD_LIBRARY_PATH.

Hi Duncan,

We tried including limb center-of-mass optimization in AddBiomechanics, but found that the benefit was neglible relative to the added complexity in the dynamics fitting optimization.

-Nick

Hi Samane, If you want to build on Ubuntu from source, please refer to the following build script: https://github.com/opensim-org/opensim-core/blob/main/scripts/build/opensim-core-linux-build-script.sh. If you just need a working Python environment with OpenSim on Linux, please consider using the Op...

Hi Francine, If a coordinate already has a CoordinateActuator associated with it, by default, ModOpAddReserves() will not apply another CoordinateActuator to that coordinate. However, the same advice applies: for a CoordinateActuator in the model, take its control value multiplied by the optimal for...

Hi Oliver, If you need more customization in your parameter optimization workflow, then the Muscle Redundancy Solver is a great alternative (I used it for my research before we created Moco). You could implement a custom MocoGoal, since parameters are applied to the model and will be available when ...

Hi Aaron,

I can't guarantee any packages on opensim_admin to be totally stable, but it should work fine for your purposes. Very soon we will have officially conda pacakges on the opensim-org channel, so stay tuned for that too.

Best,
Nick

Hi Oliver, It is currently not possible to add cost term to minimize deviations from the initial parameter value. The SmoothSphereHalfSpaceForce properties are not available as Outputs, so they cannot be used with MocoOutputGoal. I've considered adding support for "parameter regularization" as you d...

Hi Duncan,

If your original GRF files contained moments, they should get propagated to the output. Can you upload your input GRF data file?

Best,
Nick

Hi Duncan,

We do use GRF moments during the dynamics fitting step. Where are you not seeing them?

-Nick

Hi Mikayla, Christian, If optimizing parameters, then you problem want to set the MocoCasADiSovler property parameters_require_initsystem . You might consider ignoring muscle passive forces in addition to activation and tendon dynamics (see ModOpIgnorePassiveFiberForcesDGF ). Then you would be free ...