Differences of ID and IK in OpenSim 3.3 and 4.0
Posted: Fri Oct 12, 2018 7:28 am
Hi all,
I found the inverse dynamic result from the OpenSim 3.3 GUI and OpenSim 4.0 GUI are different when I use them to analyze the exactly same model and IK file(generated from OpenSim 3.3 GUI). The values are slightly different (e.g., around 0-2Nm).
Moreover, when I use OpenSim 4.0 to calculate the inverse kinematics using the same TRC file as in OpenSim 3.3, the results are also different. (For some spinal joints, varied like 10 degrees).
This thing only happens to my model (a complex model but without constraints and force elements). For other models, like Gait2392, the IK and ID results from the two versions are the same.
Anyone knows if there is any difference in the inverse dynamic and inverse kinematics solver in the two OpenSim versions?
Thank you and kind regards,
Wei
I found the inverse dynamic result from the OpenSim 3.3 GUI and OpenSim 4.0 GUI are different when I use them to analyze the exactly same model and IK file(generated from OpenSim 3.3 GUI). The values are slightly different (e.g., around 0-2Nm).
Moreover, when I use OpenSim 4.0 to calculate the inverse kinematics using the same TRC file as in OpenSim 3.3, the results are also different. (For some spinal joints, varied like 10 degrees).
This thing only happens to my model (a complex model but without constraints and force elements). For other models, like Gait2392, the IK and ID results from the two versions are the same.
Anyone knows if there is any difference in the inverse dynamic and inverse kinematics solver in the two OpenSim versions?
Thank you and kind regards,
Wei