Share coordinate over two joints

[Simon Harrison]

Hi,

Can I use one DOF to specify the joint angle of two separate joints? e.g. use the knee flexion angle to specify the flexion angle of an (added) patella relative to the tibia? Obviously, I would need to use cubic spline fitting to map a knee flexion angle into a patella angle.

I have tried this and have only returned an "Array out of bounds" error.

I can do this off-line after IK, but it would be better not have to.

[Ayman Habib]

Hi Simon,

Have you looked into using a "CoordinateCoupler" constraint? What exactly did you try?

Thanks,
-Ayman

[Simon Harrison]

Ayman,

I did not use the CoordinateCoupler constraint. I just tried to reference the same coordinate twice.

CoordinateCoupler works at treat - thanks.

Simon