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Can I designate a joint having 2 centers of rotation for 2 coordinates (Recently, I modify in OSIM file).
For example, MCP2 has 2 coordinates. The first center of rotation for flex-extension is [a b c] and the second one for ad-abduction is [d e f].

Thank you in advance.

Kiatbodin W.

It depends what you are trying to do. If I understand correctly, you want the joint to behave like two pin joints with different centers of rotation. You could produce this effect using a single CustomJoint, but it would probably be simpler to use two pin joints separated by a massless body.

Sorry to ask that Do you have an example of 'a CustomJoint' for this situation.