feat(TetrahedralSolid): adding polyhedron_edges() function, to return 6 polyhedron facet edges

Author: benoit2776

include/geode/mesh/core/tetrahedral_solid.hpp

@@ -67,6 +67,9 @@ namespace geode
         [[nodiscard]] PolyhedronEdgesVertices polyhedron_edges_vertices(
             index_t polyhedron ) const final;
 
+        [[nodiscard]] std::array< PolyhedronFacetEdge, 6 > polyhedron_edges(
+            index_t polyhedron ) const;
+
         [[nodiscard]] PolyhedronFacetsVertices polyhedron_facets_vertices(
             index_t polyhedron ) const final;
 

src/geode/mesh/core/tetrahedral_solid.cpp

@@ -404,6 +404,34 @@ namespace geode
         return result;
     }
 
+    template < index_t dimension >
+    std::array< PolyhedronFacetEdge, 6 >
+        TetrahedralSolid< dimension >::polyhedron_edges(
+            index_t polyhedron ) const
+    {
+        std::array< PolyhedronFacetEdge, 6 > result;
+        const auto vertices = this->polyhedron_vertices( polyhedron );
+        result[0] = this->polyhedron_facet_edge_from_vertices(
+                            { vertices[0], vertices[1] }, polyhedron )
+                        .value();
+        result[1] = this->polyhedron_facet_edge_from_vertices(
+                            { vertices[0], vertices[2] }, polyhedron )
+                        .value();
+        result[2] = this->polyhedron_facet_edge_from_vertices(
+                            { vertices[0], vertices[3] }, polyhedron )
+                        .value();
+        result[3] = this->polyhedron_facet_edge_from_vertices(
+                            { vertices[1], vertices[2] }, polyhedron )
+                        .value();
+        result[4] = this->polyhedron_facet_edge_from_vertices(
+                            { vertices[1], vertices[3] }, polyhedron )
+                        .value();
+        result[5] = this->polyhedron_facet_edge_from_vertices(
+                            { vertices[2], vertices[3] }, polyhedron )
+                        .value();
+        return result;
+    }
+
     template < index_t dimension >
     PolyhedronFacets TetrahedralSolid< dimension >::polyhedron_vertex_facets(
         const PolyhedronVertex& polyhedron_vertex ) const