IK in Opensim 3.3

[Zakia Hussain]

Hi everyone

I am using OpenSim 3.3. When i do the IK analysis, the model appears to be shaking which also results in rough IK plot like


Also it only happens when i use this model https://simtk.org/frs/?group_id=933

Although its filtered during ID but what can be the possible reason?

Thank you

Regards
Zakia

[Luca Modenese]

Hello Zakia,
if I remember correctly sometimes the accuracy value could cause that. I would try changing

Code: Select all

<accuracy>1e-005</accuracy>

to something like

Code: Select all

<accuracy>1e-008</accuracy>

in the IK setup file.
I hope this helps,
Luca

[Zakia Hussain]

Hi Luca

Thanks for responding

This worked and improved the IK results significantly.


Thanks again

Best regards
Zakia