public btGeneric6DofConstraint createGeneric6DofConstraint(
     btRigidBody rbB, Matrix4 frameInB, boolean useLinearReferenceFrameB) {
   long cPtr =
       ExtrasJNI.btWorldImporter_createGeneric6DofConstraint__SWIG_1(
           swigCPtr, this, btRigidBody.getCPtr(rbB), rbB, frameInB, useLinearReferenceFrameB);
   return (cPtr == 0) ? null : new btGeneric6DofConstraint(cPtr, false);
 }