GMSH Geometry problem
 

Hi all,

I am new in all about GMSH, but I have to solve problem with inserting volume to volume. For emaple: You have created cube, created points, lines, surfaces and volume and now I have to insert smaller cube inside this bigger and make new volume witch is volume bigger cube minus smaller cube. Is there some smart solution how to do this? Or I have to make all lines surfaces and volume again?

I am sorry for my english.
I woudl by very pleased if someone helps me.

Thanks