This joint is an extension of the double hinge joint additionally constraining the angular velocity of the second body along the hinge axis to be -ratio times that of the first body. Effectively this implements a gearbox with mounting hinges for the two bodies and a gear mesh between them. The joint only works for two bodies as allowing it to be attached to the static environment would effectively degenerate it into a fixed joint. Patch is against revision r1891 and contains a demo.
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