[Gmsh] Recursive extrusion

[Umut Tabak]

Dear all,

I could not find a better way to explain my problem  in the subject 
line, let me explain what I tried, I would like to extrude a meshed 
surface to generate a structured grid of hexas. That is fine.

On top of that is that possible to use the top surface given with the 
index '0'(coming from the 1st level extrusion) as a source for another 
extrusion operation to generate a second layer of structured grid.

Attached code will explain that better I guess. Uncommented lines will 
tell the needed.

Best regards,
Umut
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