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I'm making a game for Kinect in Unity which tracks hand movements. I have the player's root position and the position of their fist stored as 3-dimensional vectors (Vector3 in Unity), but they're both in world space.

How can I determine the location of the player's fist relative to their root position?

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Use Vector3 relativeFistPosition = globalFistPosition - globalRootPosition; to get the fist position relative to the root. Use this new Vector3 for comparing different moves.

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