diff --git a/algoim/organizer/primitive.hpp b/algoim/organizer/primitive.hpp
index 19cd4f7..a475496 100644
--- a/algoim/organizer/primitive.hpp
+++ b/algoim/organizer/primitive.hpp
@@ -762,6 +762,8 @@ struct VisiblePrimitiveRep {
     std::vector<tensor3> tensors;
     AABB                 aabb;
     organizer::BlobTree  subBlobTree;
+
+    bool isEmpty() const { return tensors.empty(); }
 };
 
 // hesai