Scaling only adjusts the bony geometries along their primary axes (X,Y,Z). The long axis of the femur passes from the mid-condyle point to the center of the femoral head. Assigning the appropriate scaling factors is very challenging and can be a bit easier if you go through a functional joint center...

you'll need to manually edit a setup xml to include it. you can do this by using the analysis tool gui and saving the xml - then copying and pasting the 'analysisset' portion into the cmc setup xml.

Ross makes a really good point that I think gets over looked a lot. Simulations are super sensitive to MTU length - especially tendon slack length. Rajagopal+ 2016 describes how the opensim MTUs are tuned. This is also sensitive to the joint position when tendon slack length is adjusted. One way to ...

I just put this matlab call together. it seems to do the trick... it uses model and other files from the gait10dof folder

*edit* i'm having trouble uploading attachements. PM if you'd like these matlab scripts.

I don't think this feature has been added - at least it doesn't show up in the API docs and a recent post suggests this feature isn't available... https://simtk.org/plugins/phpBB/viewtopicPhpbb.php?f=91&t=7430&p=19634&start=0&view=&sid=7f3b3c52d1b8ca7a53cbf303593dc4a0 i'd recommend running the RRA t...

.mot and .sto files are pretty similar (with some small differences in the header info - the first 5 rows are the same and it ends with 'endheader' before the variable names and data). attached is a matlab function that reads both file formats and builds a structure. *edit* i'm not able to attach th...

TRCs are just text files containing some header info and marker trajectories.

I believe there are some MATLAB functions written by members of the opensim community posted somewhere on simTK. I've attached a function I wrote and use to generate scaling TRC files.

It looks like the Rajagopal model limits the rotation range of the pelvis to 90 degrees in all directions. If your subject was standing in a direction outside of this range (with respect to your lab coordinate system) then this could also cause the problem... you can go into the osim file and change...

Consider including the joint postures of the joints you know the angles to during the static trial. Including the sagittal joint angles for the hip, knee, and ankle should help improve the offsets of the gencoords during IK. This is all assuming that body scaling was pretty good.

Are you interested in putting a joint in between the hip and knee joint? If this effectively turns the femur into proximal and distal segments, then you'd need to (1) reformulate the knee translation function or (2) just model the knee joint as a pin-joint. After first read of your post, I would be ...