Hello I am trying to create a frame at one of the foot markers and express the center of pressure relative to that frame - but I am having issues. I think it is because the marker and force data are not expressed in the same frame initially (obviously the motion capture system has a different origin...

Hello, I normally use inverse kinematics and get maximum marker error of less than 4cm as per the documentation. However, I am now trying squat movements and whatever I do (including changing weights) the maximum error does not go below 6cm for some part of the movement. Is that much error okay? Or ...

Hello, How do CMC muscle activations work/what does their amplitude mean? i.e. what does an activation of 1 mean? Is it MVC for example, or what? I am trying to compare the muscle controls with EMG data (which is normalized to the maximum during gait), but I have no idea as to how the amplitudes sho...

Hello, I am running simulations for elderly subjects (70+) using the gait2392 model. Should I make any changes to the model to get better CMC and metabolics results? I am expecting a higher cost of walking for elderly, but I didn't seem to find any changes while using the same model. It is suggested...

Hi! Force plate data is not always valid when the foot is not in contact with it, so I used a text editor and replaced NaNs with zeros!

Hello, I followed the OpenSim pipeline for a walking model - scaling, IK, ID, RRA, and CMC. I got good results, that correlated well to the published data and also had low residuals and pErr. I am now trying to compare the CMC results with the published EMG (which is normalized to the gait cycle and...

Thank you Hans, yeah I don't have any upper-body markers, and it was almost my first attempt at scaling. Eventually I ended up removing the torso viewtopic.php?f=91&t=17849&sid=129db9d5 ... f7cbfcd01a, any further insights are welcome!

Ah I didn't even notice, thank you so much! I am attaching a sheet with a comparison between OpenSim results and the results published by C. Fukuchi et al. using Visual 3D. I am assuming the results are not way far off, are they? And now what tools can I run on this torso-less model? You previously ...

Hi and thank you for your reply. For some reason I am unable to save the scaled model, so I am attaching the scale setup file, IK output file, and ID results as .xlsx (couldn't attach .sto).

Hello, I have just started using OpenSim with data other than that of the tutorials. I have lower body marker data, so I modified the gait2392 model, removing the torso and associated muscles. I ran the scale tool successfully, and then inverse kinematics, all fine (max error ~4.2cm). When I run the...