Head motion

Main Forum
1

Dear AnyBody,

I am using motion capture data to run my head motion model - please see the model attached. My model loads OK but fails when I run kinematic analysis. Could you please advise what am I doing wrong.

Thank you in advance for your help.

2

Hi,

Would please let us know which version of AMS and AMMR your are using?

Best regards,
Moonki

3

Dear AnyBody,

I am using version 1.3. My apologies for sending incomplete information.

4

I am using version AMS 5.0 and AMMR version 1.3. My apologies for sending incomplete information.

5

Hi Ashish,

if you run your model, it will tell you that it has

662 independent constraints and 682 unknowns

that means you need to get rid of unknowns or include more constraints.

If you take out the arms in the BodyModel.any and switch to Trunk instead of Trunk&Neck it will load and do kinematics.

6

Dear AnyBody,

Thank you for your reply.

Model kinematics work, but head posture is very awkward.

Seems like rhythm driver are not working, since only trunk is selected.

I am using three markers for tracking head motion with respect to trunk. What will be your recommendation - Shall I put a few markers in the cervical region to include more constraints?

Please advise.

7

Hi,

Attached please find a modified version of your model which is working well.

You should look into ‘JointsAndDrivers.any’ file carefully.

Before asking another question, please try to understand this modified model perfectly using your enough time.

I hope this may help you.

Best regards,
Moonki