Week 4

Hey everyone, welcome back to my blog!

This week I continued focusing on data processing and trying to get OpenSim to read my data.

Last week I left off stuck on calibrating and running the IMU placer tool. To figure out the issue, I went back and reread the IMU placer and inverse kinematics tutorials from the OpenSense platform. After that, I looked through the example data files they provided and compared them to mine.

I realized the problem was in my calibration file—my code was only taking the first time frame instead of using the full motion data. So I started working on fixing my code to correctly process the data file.

Right now, I’m still trying to convert my full IMU orientation file into a proper initial placement file. I’ve been getting a lot of errors each time I run it, so I’m going through them one by one and debugging slowly.

On a different note, I also tried running the example model from the OpenSense platform to see how the IMU placer and inverse kinematics tools are supposed to work. Even though it ran, the output looked off—the walking simulation turned into a person kind of floating and rotating strangely. The model kept bending at the torso, even though it was supposed to just be a simple walking motion.

I’m not sure yet if this is a calibration issue on my end, something wrong with the software setup, or a problem with the example data itself, so that’s something I’ll keep looking into.

Thanks for reading, and see you in the next one!