First of all, I am aware that this problem was already reported here twice. However, I have additional information here for the developers and people that might come across the same issue.
The problem: I am using Analysis tool + OutputReporter to get the position, velocity and acceleration of a marker during a motion. While the position and velocity values seem good, the acceleration values are too high (in the order of thousands of meters per second
)I am using the gait2392 model and the normal, crouch1 motions.
Attempt to solve 1: I tried using MATLAB instead of the software to do the same job. Unfortunately the error persists.
Attempt to solve 2: I turned off gravity (setting it 0 0 0). The acceleration changes only a bit. But still too high to be correct.
Attempt to solve 3: Following the hint of Carmichael Ong, I prescribed the motion on the model, and used the Forward tool + OutputReporter. Strangely, the acceleration for the height axis (Z?) decreased significantly and looks correct (even though I have not verified by comparing to the finite differences of the velocity). The acceleration for the remaining axes are still too high.
Is there any other workaround worth trying? Or was this issue already addressed in the latest commit on Github?
Thank you.