# Defining meshorder in grouped material

This is really important for me!!!
I need to simulate core-shell NWs. If I use the script generated structure I can not define the meshorder. I am very confused how can I do that. Any help please!!!

Could you provide more details on the modeling you are doing?
Unless you be more specific, I can only recommend the page https://kb.lumerical.com/en/materials_mesh_order_optical.html

elect("rectangle");