Hi everyone, I downloaded the source code for the new OpenSim 4.5.1 API because of the new MocoGoals that got introduced in the update (mainly the MocoExpressionBasedParameterGoal). I have built OpenSim Core and all its dependencies through the terminal with CMake. It took me several attempts but I ...

Hi Nick, Good to know. I tried a few other things and I keep running into the same issue. I tried to optimise the trunk segments COM (i.e., called 'Body' in my model). % optimise body COM position COMxPos = Bodies.get('Body').getMassCenter().get(0); COMyPos = Bodies.get('Body').getMassCenter().get(1...

Hi everyone, I tried parameter tuning in OpenSim Moco using MocoTrack. I can run MocoTrack without any issues with a MocoControlGoal and a MocoContactTrackingGoal. However, as soon as I add a MocoParameter to the problem it fails. My problem is set up as follows: % initialise Moco Study study = trac...

Hi Ernesto, The MocoContactTrackingGoal only minimises the (projected) force error. It does not track the COP nor the torques. See here: https://opensim-org.github.io/opensim-moco-site/docs/0.4.0/class_open_sim_1_1_moco_contact_tracking_goal.html The zeros in the referenceGRF.sto make sense as that ...

Hi Nick, Thank you for your reply. I tried to formulate such a custom MocoGoal to regularise MocoParameters. Generally the problem set up is as follows: % Construct the MocoInverse inverse = MocoInverse(); modelProcessor = ModelProcessor(model); inverse.setModel(modelProcessor); % initialise Moco St...

Hi Nick, Thank you for your clarification! Good to know that muscle parameter tuning (i.e., optimal fibre length or tendon slack length) in this way is also not yet possible in Moco, which would have been my next step. I assume this means that it is currently only possible in the the Muscle Redundan...

Hi everyone, I am trying to optimise the contact model, and especially the contact radii of my contact spheres and the stiffness of the SmoothSphereHalfSpaceForce, based on GRF and kinematic data. I use MocoInverse to prescribe my kinematics and a MocoContactTrackingGoal to track my GRF data. I curr...

You will need to install the maci64 version of Matlab. Apple Silicon is not yet supported, see here: viewtopicPhpbb.php?f=91&t=17519&p=0&sta ... a8c7e5d16e

Hi everyone, I am trying to simplify a model in OpenSim 4.5 by combining and/or deleting some muscles. In the process I want to remove wrap objects that are still in the model but no longer used, as the muscles, which used to referenced them, got deleted. Rather than deleting them manually in a text...

Update: I installed MATLAB R2023b Update 6 (maci64), which I can run with Rosetta 2. This allowed me to successfully link it with OpenSim through the MATLAB API. It was definitley an issue with the initial MATLAB version being arm64 causing the architecture mismatch. Are there plans to include Appl...