Moco always uses an initial guess. If you don't specify one, it will create a guess using the midpoint between the variable bounds. Possibly this default guess is a problem when using 30 mesh intervals for your problem. When using different mesh intervals, the problem is discretized differently, mea...

To add: if building from source, OpenSim should work with whatever Python version you build against. Just make sure that your Python environment you install in matches the one in your build.

Hi Samane, You found an error in our script! You need to add "-DOPENSIM_WITH_CASADI=$MOCO -DOPENSIM_WITH_TROPTER=$MOCO" to the following line for the flag disabling Moco to work: https://github.com/opensim-org/opensim-core/blob/accddd7f7351f3fa7da8a482c11e97545d19a81e/scripts/build/opensim-core-linu...

Hi Mohammadreza,

Have you tried using the solution using 25 mesh intervals as the initial guess for the problem using 30? Usually this type of error has to do with the initial guess.

-Nick

Hi Sivaprasad, It's hard to say how many iterations a problem will require, but 600 is not an usually high number. If you can unseal the solution, have you tried plotting all the results? Are any model actuator controls hitting their variable bounds? If so, have you tried adding strong reserve actua...

Hi Mohammadreza, How many iterations did each optimization take? It seems like including activation dynamics required less. Just because a problem has less variables, doesn't mean that it will converge faster. Activation dynamics might be adding some useful convergence properties in this case. -Nick

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...