Hi Finn, When I run ID through MatLab, I have set the parameters manually rather than use the setup file. Maybe there is something that is not being pulled from the file. Here's the code I use: ikStorage=Storage(fullfile(ikFilePath)); idTool=InverseDynamicsTool(); excludedForces = ArrayStr(); exclud...

Hi XiPeng, Here is an example of this option for a medial condylar joint when used in a model based on the Lerner knee model. Hope this helps: <CustomJoint name="med_cond_joint_r"> <!--Path to a Component that satisfies the Socket 'parent_frame' of type PhysicalFrame (description: The parent frame f...

Hey there, So from what I can tell, you are bringing in the guess, including the ankle kinematics into your problem. But it seems your problem does not use the ankle kinematics. So that is why you are getting this error. Are you intentionally not using them as part of your problem? If you are intend...

Hi all, I was looking at the errors between my CMC output and RRA input and evaluating the errors between them. I was curious about the utility of using the pErr files. For context,here is the pErr for one joint (L hip rotation) after running CMC on an RRA output: hip rotation.png Looking at this gr...

The output you displayed gives a few possible reasons, but it seems that the optimizer is not able to find a solution for the initial position. It's hard to give you an answer without more information about your problem or your workflow, because this error can appear for a number of reasons. Some co...

Hi there, I just ran into a similar issue, albeit with the gait2392 model. I found a rather odd solution. Are you filtering the RRA kinematics file using the 6Hz filter in the GUI? I found that when I unchecked that box, my residuals dropped dramatically. I have no idea why that worked, but it worke...

Hi there,
Are there any plans to update this tool for use with OpenSim 4? I know it was built in 3, and there are some functions that currently do not work as some of the underlying functions has changed.

Thanks!

This may or may not be the correct answer, so take this with a grain of salt. I have seen it said that Moco has trouble with wrapping surfaces, so previous work has changed those surfaces to "conditional path points." Specifically, Dr. Miller did this with his study in 2021: https://peerj.com/articl...

Hi Matthew, I don't know anything about the spline that is used in OpenSim, but I can help you with the second question you have. After you have generated an IK file, you can use that file as the input for the Analyze tool, and select the "Kinematics" analysis. This should give you three outputs: on...

You first need to convert a C3D file to use in OpenSim. Please see https://simtk-confluence.stanford.edu:8443/display/OpenSim/C3D+%28.c3d%29+Files for details. In order to obtain joint angles, you will need to create a model to use with that data and use the Inverse Kinematics tool. Please see https...