For our research we are trying to track the thumb adduction and abduction angular movement during a gesture.
Previously, we successfully captured finger flexion and extension joint angle data for MCP, PIP, and DIP joints, using the AngleTo() method, as described here: https://stackoverflow.com/questions/46263169/leap-motion-get-finger-bending-c
Does anyone know of a similar method we could use for capturing abduction and adduction movement?
Failing that, how do we capture the vector-based location information for the 3 spheres highlighted in the image below? From that, we should be able to calculate the necessary adduction and abduction angle data during thumb movement using some trigonometry.
Many thanks in advance.