Hi, In the scaling step, we can specify the age, height, and weight in the setup file. I want to know how do these characteristics affect the Inverse Kinematic result in OpenSim? Will they affect? If I just simply change different age and weight of a human model but applying same experimental trajec...

Hi there, I'm simulating squatting using my own motion capture data, but when I'm running inverse kinematics I found the foot is not flat(the toes is downward). I think the foot should be flat and the preview marker data also shows the foot is flat when squatting. How should I reduce this error? In ...

Hi, I am running Analyse based on the IK result. The IK result(coordinates data) and my original motion capture data are sampled at 100Hz; the time step is 0.01s. However, when I click the box of filtering the coordinates in the Analyse tool, it resample the data with different time step (~0.0202436...

Hi,

I encountered the same problem. How do you solve it at the end?

Thanks,
Yanran

Hi Dimitar, Thank you for your reply. I want to get velocity by using different subjects' marker motion data. When I scale, IK and run analyse tool for the first subject, the time starts from t=0s with loss pass filter. But I do the totally same procedure for the second and third subject, the initia...

Hi there,

I encounter a time error when filter the coordinates (Analyse tool). The original time should be from 0 to 1012.18, but the filter function resample the time, leading to executing time from -0.02 to 1012.18. Is there any solution to start with 0 rather than -0.02?

Thanks,
Yanran

Hi Carmichael, Thank you so much! That's what I want and really helpful. In the Analyze tool, orientation of body segment in BodyKinmatic is with respect to the global frame and it represents the orientation of COM of each body segment. Since I want to convert IMU data in Xsens MVN file to be expres...

Hi carmichael, Thank you so much for your answer. Do you know how opensim convert global angular velocity/acceleration to local angular velocity/acceleration? I didn't find the exact formula and code there.w(in local)=R*w(global) and obtain R from the the orientation of the segment with respect to t...

Hi there, In the Analyse tool, the setup file of Body kinematics shows we can decide to express the result in global or body local frame. But when I found at the top of result file, it always write"Angular velocities and accelerations are given about the body-local axes." whether at global file or b...

Hi there, I'm doing simulation of squat. When I run the static optimization, there are some messages I don't understand well. 1. " Try appending the model with additional forces or locking joints to reduce the following acceleration constraint violations pelvis_tilt: constraint violation=2.919 " I h...