public btMultiSphereShape createMultiSphereShape(
     btVector3 positions, java.nio.FloatBuffer radi, int numSpheres) {
   assert radi.isDirect() : "Buffer must be allocated direct.";
   {
     long cPtr =
         ExtrasJNI.btWorldImporter_createMultiSphereShape(
             swigCPtr, this, btVector3.getCPtr(positions), positions, radi, numSpheres);
     return (cPtr == 0) ? null : new btMultiSphereShape(cPtr, false);
   }
 }