create a mesh without any data
module DVextract_mesh {
Mesh+IPort2 ∈
Node_Data out_nd {
nnodes => <-.in.nnodes;
nnode_data = 0;
};
Mesh+Node_Data+OPort2 &out=>merge(out_nd, in);
};
DVextract_mesh outputs the same mesh as the input, but with no node data (nnode_data=0).
Mesh+Node_Data. The output mesh is copied from this input.
Mesh+Node_Data. Contains only the mesh part of the input field.