adding elements check to is_meshed

Author: MelchiorSchuh

src/geode/inspector/topology/brep_blocks_topology.cpp

@@ -182,7 +182,8 @@ namespace geode
 
     bool BRepBlocksTopology::block_is_meshed( const Block3D& block ) const
     {
-        return block.mesh().nb_vertices() != 0;
+        const auto& block_mesh = block.mesh();
+        return block_mesh.nb_vertices() != 0 && block_mesh.nb_polyhedra() != 0;
     }
 
     bool BRepBlocksTopology::block_vertices_are_associated_to_unique_vertices(

src/geode/inspector/topology/brep_lines_topology.cpp

@@ -141,7 +141,8 @@ namespace geode
 
     bool BRepLinesTopology::line_is_meshed( const Line3D& line ) const
     {
-        return line.mesh().nb_vertices() != 0;
+        const auto& line_mesh = line.mesh();
+        return line_mesh.nb_vertices() != 0 && line_mesh.nb_edges() != 0;
     }
 
     bool BRepLinesTopology::line_vertices_are_associated_to_unique_vertices(

src/geode/inspector/topology/brep_surfaces_topology.cpp

@@ -186,7 +186,9 @@ namespace geode
     bool BRepSurfacesTopology::surface_is_meshed(
         const Surface3D& surface ) const
     {
-        return surface.mesh().nb_vertices() != 0;
+        const auto& surface_mesh = surface.mesh();
+        return surface_mesh.nb_vertices() != 0
+               && surface_mesh.nb_polygons() != 0;
     }
 
     bool BRepSurfacesTopology::

src/geode/inspector/topology/section_lines_topology.cpp

@@ -142,7 +142,8 @@ namespace geode
 
     bool SectionLinesTopology::line_is_meshed( const Line2D& line ) const
     {
-        return line.mesh().nb_vertices() != 0;
+        const auto& line_mesh = line.mesh();
+        return line_mesh.nb_vertices() != 0 && line_mesh.nb_edges() != 0;
     }
 
     bool SectionLinesTopology::line_vertices_are_associated_to_unique_vertices(

src/geode/inspector/topology/section_surfaces_topology.cpp

@@ -120,7 +120,9 @@ namespace geode
     bool SectionSurfacesTopology::surface_is_meshed(
         const Surface2D& surface ) const
     {
-        return surface.mesh().nb_vertices() != 0;
+        const auto& surface_mesh = surface.mesh();
+        return surface_mesh.nb_vertices() != 0
+               && surface_mesh.nb_polygons() != 0;
     }
 
     bool SectionSurfacesTopology::