A gear joint is used to connect two joints together. Either joint can be a RevoluteJoint or PrismaticJoint. You specify a gear ratio to bind the motions together: coordinate1 + ratio coordinate2 = constant. The ratio can be negative or positive. If one joint is a revolute joint and the other joint is a prismatic joint, then the ratio will have units of length or units of 1/length.
Warning: The revolute and prismatic joints must be attached to fixed bodies (which must be body1 on those joints).
The ratio for connection between the two joints. It is used for calculating the connection constant = coordinate1 + ratio coordinate2
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