Applying inverse kinematics of one model to another

[Saadia Talay]

Hi! I am trying to generate an inverse kinematics motion file on the London Lumbar Spine Model (LLSM) present in the opensim repository.
I took the Full Body Lumbar Spine Model (FBLS) from the repository and matched the markers of the FBLS to the LLSM. I scaled the LLSM using the FBLS setup file after making a few additions and edits in the marker sets. The model scaled successfully, however I did lose some of my vtp files. Is there a reason for that?

After scaling, I tried running the inverse kinematics using the FBLS model's IK setup file. In the output file, I am getting all zeros for the lumbar spine variables. I need to know whether this is correct and if not, how do I fix it?

This is the original image:

original.PNG (92.88 KiB) Viewed 160 times

This is the scaled image:

scaled.PNG (75.64 KiB) Viewed 160 times

IK output files:

IK LS.PNG (24.35 KiB) Viewed 160 times