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btTransform localA, localB;
localA.setIdentity();
localB.setIdentity();
localA.setOrigin(btVector3(btScalar(0.0), btScalar(0.0), btScalar(0.0)));
localB.setOrigin(btVector3(btScalar(0.0), btScalar(0.0), btScalar(0.0)));
hingeC = new btHingeConstraint(bodyA, bodyB, localA, localB);
hingeC->setLimit(btScalar(0.0), btScalar(0.0));