diff --git a/network_process/include/post_topo/filter_polygon_faces.hpp b/network_process/include/post_topo/filter_polygon_faces.hpp
index fb76e4e..f6a73ad 100644
--- a/network_process/include/post_topo/filter_polygon_faces.hpp
+++ b/network_process/include/post_topo/filter_polygon_faces.hpp
@@ -13,4 +13,6 @@ dynamic_bitset_mp<> filter_polygon_faces(const stl_vector_mp<polygon_face_t>&
                                          stl_vector_mp<uint32_t>&                      output_polygon_faces,
                                          stl_vector_mp<uint32_t>&                      output_vertex_counts_of_face);
 
-void filter_active_vertices(stl_vector_mp<Eigen::Vector3d>& vertices, stl_vector_mp<uint32_t>& output_polygon_faces);
\ No newline at end of file
+void filter_active_vertices(stl_vector_mp<Eigen::Vector3d>& iso_pts,
+                            stl_vector_mp<Eigen::Vector3d>& vertices,
+                            stl_vector_mp<uint32_t>&        output_polygon_faces);
\ No newline at end of file
diff --git a/network_process/src/post_topo/filter_polygon_faces.cpp b/network_process/src/post_topo/filter_polygon_faces.cpp
index 1e2c020..b84950e 100644
--- a/network_process/src/post_topo/filter_polygon_faces.cpp
+++ b/network_process/src/post_topo/filter_polygon_faces.cpp
@@ -82,10 +82,12 @@ dynamic_bitset_mp<> filter_polygon_faces(const stl_vector_mp<polygon_face_t>&
     return active_face_label;
 }
 
-void filter_active_vertices(stl_vector_mp<Eigen::Vector3d>& vertices, stl_vector_mp<uint32_t>& output_polygon_faces)
+void filter_active_vertices(stl_vector_mp<Eigen::Vector3d>& iso_pts,
+                            stl_vector_mp<Eigen::Vector3d>& output_vertices,
+                            stl_vector_mp<uint32_t>&        output_polygon_faces)
 {
     stl_vector_mp<uint32_t> unique_vertex_indices{};
-    dynamic_bitset_mp<>     vertex_visited(vertices.size(), false);
+    dynamic_bitset_mp<>     vertex_visited(iso_pts.size(), false);
     for (const auto& vertex_index : output_polygon_faces) {
         if (!vertex_visited[vertex_index]) {
             unique_vertex_indices.emplace_back(vertex_index);
@@ -102,6 +104,6 @@ void filter_active_vertices(stl_vector_mp<Eigen::Vector3d>& vertices, stl_vector
 
     stl_vector_mp<Eigen::Vector3d> unique_vertices{};
     unique_vertices.reserve(unique_vertex_indices.size());
-    for (const auto& vertex_index : unique_vertex_indices) { unique_vertices.emplace_back(vertices[vertex_index]); }
-    std::swap(vertices, unique_vertices);
+    for (const auto& vertex_index : unique_vertex_indices) { unique_vertices.emplace_back(iso_pts[vertex_index]); }
+    std::swap(output_vertices, unique_vertices);
 }
\ No newline at end of file