ChipmunkConstraint Forces one body to rotate at a specific ratio of another.
| phase | The initial angular difference of the bodies' rotations in degrees. |
| ratio | The gear ratio. |
| bodyB | The other body that the constraint attaches to. |
| impulse | The magnitude of the impulse this constraint applied last frame. |
| maxForce | Maximum force the constraint is allowed to use. |
| errorBias | Rate that error (stretching of the constraint) is fixed. |
| maxBias | Maximum rate that constraint error is fixed. |