Forces one body to rotate at a specific ratio of another.
| phase | The initial phase offset of the bodies' rotations in degrees. |
| ratio | The gear ratio. |
| bodyB | The other body that the constraint attaches to. |
| maxForce | Maximum force the constraint is allowed to use. |
| errorBias | Rate that error (stretching of the constraint) is fixed. |
| maxForce | Maximum rate that constraint error is fixed. |