public btGeneric6DofSpring2Constraint createGeneric6DofSpring2Constraint(
     btRigidBody rbA, btRigidBody rbB, Matrix4 frameInA, Matrix4 frameInB, int rotateOrder) {
   long cPtr =
       ExtrasJNI.btWorldImporter_createGeneric6DofSpring2Constraint(
           swigCPtr,
           this,
           btRigidBody.getCPtr(rbA),
           rbA,
           btRigidBody.getCPtr(rbB),
           rbB,
           frameInA,
           frameInB,
           rotateOrder);
   return (cPtr == 0) ? null : new btGeneric6DofSpring2Constraint(cPtr, false);
 }