Hello,

I was wondering if there is a way to output the joint center locations that OpenSim uses when performing inverse kinematics?

Thank you,
Duncan Lee

Hi Nicholas, I was wondering if you have any insights or suggestions on what to do about this? Do you know if it is successfully using the moments in ID given the outputs? If it has to do with the format of my input file I can try different formatting. Also, is there any way to get the calculated jo...

Hello, I was wondering whether AddBiomechanics takes into account limb center of mass position in the subject model during subject scaling. I have noticed that in limb local coordinates, the position coordinates of the COM do not change between the unscaled model and the scaled model. For example, t...

Hi Nicholas,

The original GRF file is too large but I have attached an example portion. All the data is structured the same way.

Thanks,
Duncan

Hi Nicholas,

In the ID output GRF file I am getting, the GRFs and COPs are populated but the moment columns are not. I have attached an example file.

Thanks,
Duncan

Hello,

I noticed that when I look at the ground reaction force output files from inverse dynamics they do not contain moments, even though my input files do. Does this mean that AddBiomechanics is not using the moments for inverse dynamics?

It seems the .trc files need to be Version 4 not Version 3

Hello,

I am having a problem trying to run IK in OpenSim 4.5. The error is: "Number of workunits cannot be negative." How can I correct that?

Thank you,
Duncan Lee

Hello, I was wondering if there is anyway to force IK in OpenSim to be in radians? Right now it is in degrees and I'm not sure how to change it. Also there seems to be a bug in which the GUI does not recognize files. I have encountered this when trying to run ID. In the save path box, the location p...

Hi Nicholas, It doesn't generate an error, but the log shows: Avg Marker RMSE: 2.297358580624706cm Avg Residual Force: 46.69737107660755 N (5.838317793768835% of original 799.8429123958804 N) Avg Residual Torque: 21.96351022960977 Nm (100.0% of original 0.0 Nm) Avg CoP movement in 'perfect' GRFs: 0....