fix chain_index missing

network_process/src/post_topo/filter_chains.cpp

@@ -1,6 +1,4 @@
 #include <post_topo.hpp>
-#include "container/wrapper/relation_graph.hpp"
-#include "fwd_types.hpp"
 
 void filter_chains(const std::vector<polygon_face_t>&                faces,
                    const std::vector<std::vector<uint32_t>>&         patches,
@@ -31,9 +29,10 @@ void filter_chains(const std::vector<polygon_face_t>&                faces,
                 if (v1_iter != vertex_old_index_to_unique_index.end() && v2_iter != vertex_old_index_to_unique_index.end()
                     && v3_iter != vertex_old_index_to_unique_index.end()) {
                     chain_triangle_t mapped_tri{};
-                    mapped_tri.v1 = v1_iter->second;
-                    mapped_tri.v2 = v2_iter->second;
-                    mapped_tri.v3 = v3_iter->second;
+                    mapped_tri.chain_index = tri.chain_index;
+                    mapped_tri.v1          = v1_iter->second;
+                    mapped_tri.v2          = v2_iter->second;
+                    mapped_tri.v3          = v3_iter->second;
                     chain_triangles.emplace_back(mapped_tri);
                 }
             } else {