diff --git a/libsrc/meshing/meshtype.hpp b/libsrc/meshing/meshtype.hpp
index 77a0c1c0..522eb8c8 100644
--- a/libsrc/meshing/meshtype.hpp
+++ b/libsrc/meshing/meshtype.hpp
@@ -1020,13 +1020,6 @@ namespace netgen
   class DLL_HEADER MeshingParameters
   {
   public:
-
-
-    
-
-
-
-
     /**
        3d optimization strategy:
        // m .. move nodes
@@ -1131,6 +1124,8 @@ namespace netgen
     ///
     MeshingParameters (const MeshingParameters & mp2) = default;
     MeshingParameters (MeshingParameters && mp2) = default;
+    MeshingParameters & operator= (const MeshingParameters & mp2) = default;
+    MeshingParameters & operator= (MeshingParameters && mp2) = default;
     ///
     void Print (ostream & ost) const;
     /// 
diff --git a/libsrc/meshing/python_mesh.cpp b/libsrc/meshing/python_mesh.cpp
index 59099743..fc5acc62 100644
--- a/libsrc/meshing/python_mesh.cpp
+++ b/libsrc/meshing/python_mesh.cpp
@@ -465,16 +465,24 @@ DLL_HEADER void ExportNetgenMeshing()
     .def ("SetMaterial", &Mesh::SetMaterial)
     .def ("GetMaterial", FunctionPointer([](Mesh & self, int domnr)
                                          { return string(self.GetMaterial(domnr)); }))
- 
+
     .def ("GenerateVolumeMesh", FunctionPointer
-          ([](Mesh & self)
+          ([](Mesh & self, bp::object pymp)
            {
              cout << "generate vol mesh" << endl;
+
              MeshingParameters mp;
-             mp.optsteps3d = 5;
+             if (bp::extract<MeshingParameters>(pymp).check())
+               mp = bp::extract<MeshingParameters>(pymp)();
+             else
+               {
+                 mp.optsteps3d = 5;
+               }
              MeshVolume (mp, self);
              OptimizeVolume (mp, self);
-           }))
+           }),
+          (bp::arg("self"), bp::arg("mp")=bp::object())
+          )
 
    .def ("OptimizeVolumeMesh", FunctionPointer
          ([](Mesh & self)