Dear sir, Can you post the figures? Sorry, I am not allowed to share any data on the general forum post. It is possible that the coordinate system in OpenSim (e.g., knee flexion is negative) and Nexus are different. OpenSim follows the ISB conventions. To solve this I took inverse of all the values ...

hi, I have executed opensim analysis with data collected from vicon nexus system. the methodology used was Scale-IK-CMC. But when I try to compare the graphs of knee flexion angles of Opensim output and vicon outputs(for validation of analysis), I get a very large time lag (2-3sec)at the end of the ...

The vicon output for kinematic data for trial like knee joint angle, Hip joint angle, etc.

RRA is an optional (may be skipped) method that tries to reduce inconsistencies between measurements and model. Then, how to check the feasibility of the outputs? Since there is difference between vicon output and Opensim output. (I found in the forum posts that vicon doesn't have joints constraint...

Hello sir, I executed the simulation without RRA because after RRA the execution of CMC stopped at initial frame only. Also, after scaling the Foot of the model is twisted and IK runs with the distorted foot. But this distortion increases after RRA. Is it necessary to run RRA before CMC, since in th...

hi all, I am trying to analyse the muscle forces. I first executed the analysis(scaling-IK-CMC) using gait2354 model but then noticed that the muscle vastus lateralis is not included in that model so I tried executing the analysis using same data files with gait2392 model. But using this model gives...

Yes sir,
I have attached screenshots of distorted foot from simulation and scaling error here.

Hi, I have converted the c3d using "c3dExport.m" script. And I am using those .trc and .mot files for analysis. When I Scaled the model, I can see problems: 1. Foot distortion 2. Hyper extension in one knee joint, (the subject doesn't have this problem) I have more than 2 static files for the same s...

hi. I have the same problem. I have converted the c3d file using "c3dExport.m".I have attached a sample trc file converted using c3d file from Tim Dorn' s Example Data file which comes with the Matlab-Opensim Pipeline Package, with this post. The same problem occurs with other files too. Please, sug...

hi, I am using a marker set (.xml file) created by another user. The developers of this file have been using this file for Opensim analysis. But when I tried, I got an error "Failed t connect socket'parent_frame' of type PhysicalFrame" i.e. the bodyset 'humerus_r/l' mentioned in the .xml is missing ...