fix bug of accidentally delete properties while calling mesh.clear()

src/HexExtractor.hh

@@ -105,7 +105,7 @@ public:
     {
         HEXEX_DEBUG_ONLY(std::cout << "converting mesh to hex mesh" << std::endl;)
 
-        hexMesh.clear();
+        hexMesh.clear(false);
 
         calculateDifferencesInDartTypes();
 
@@ -142,7 +142,7 @@ public:
     {
         auto tovec = toVec<typename TetMeshT::PointT>;
 
-        tetMesh.clear();
+        tetMesh.clear(false);
 
         auto parametrization = tetMesh.template request_cell_property<VertexMapProp<Vec3d>>("Parametrization");
         tetMesh.set_persistent(parametrization);

src/MeshConversion.hh

@@ -37,7 +37,7 @@ void convertToHexExTetrahedralMesh(const TetMeshT& _mesh, TetrahedralMesh& _tetM
     };
 
     // add vertices
-    _tetMesh.clear();
+    _tetMesh.clear(false);
 
     for (auto v_it = _mesh.vertices_begin(); v_it != _mesh.vertices_end(); ++v_it)
         _tetMesh.add_vertex(toVec3d(_mesh.vertex(*v_it)));