Hi, this might be a stupid question. I created the GRF file with ForceLocation set to zero (forceplate origin) and one (COP). This is the output which makes sense: COP.png Then I executed Inverse Dynamics for each file. My question is why the outputs are exactly identical? Moment.png It seems that t...

Hi, this is a bug, I posted it on the GitHub page for the record: https://github.com/opensim-org/opensim-gui/issues/1529 Must wait until the developers fix it. In the meantime, there is a workaround for this bug: After creating the XML analyze tool through API, a simple code can be used to replace t...

Hi, once you created your via point through ConditionalPathPoint object, you can add it to the PathSpring as follows:
Hope this helps.

Hi, the names of the reserve actuators are specified in your actuator file, or in your model's forceset. Here is an example of an actuators file in Rajagopal2016 model: https://github.com/opensim-org/opensim-models/blob/c62c24b0da1f89178335cf10f646a39c90d15580/Pipelines/Rajagopal/CMC/walk/cmc_actuat...

Hi, depending on your problem, OpenSim finds the best optimizer. Please see: https://simtk.org/plugins/phpBB/viewtopicPhpbb.php?f=91&t=3854&p=0&start=0&view=&sid=77b9299bc1a4dc42ad43083b9c27d6be In my experience, if you omit the constraints from your model, the problem will be solved much faster. Th...

Hi, this issue has been fixed in the dev version: https://github.com/opensim-org/opensim-gui/issues/1494

You can either wait for the next official release, or try the most recent artifact via: https://github.com/opensim-org/opensim- ... ldartifact

Hope this helps.

Hi, sorry for brevity. Free coordinates are independent without any constraint, so the optimizer can change their values. The Coordinate::isConstrained method could help you find them; for example in Python: import opensim as osim model = osim.Model('Rajagopal2016.osim') state = model.initSystem() f...

Hi, you need a tracking task for every free coordinate. The issue might also be your actuator file. Similarly, in RRA you need a strong coordinate actuator for every free coordinate, but weak residual actuator for pelvis coordinates.
(weld and locked coordinates must be excluded)

Hope this helps.

Hi, the hip joint center is located in the center of the femoral head. This is also the origin of the femur geometry. So, just create a new marker, change the frame to femur_r and set the location to zero: Hope this helps.

Hi, I just tested IAA using the dataset and setup files available here (https://simtk.org/projects/nmbl_running). I confirm that after loading the setup file in the GUI, both socket_rolling_body and socket_surface_body fields are empty (the tool doesn't get those parameters from the XML file), and t...