[Gmsh] Prism layer for 3D stp file

[ANDREA BORTOLI]

Hello everybody
I would like to know if it is possible to extrude a prism layer normal to
the surface of a 3D model that I've importet as a .stp file.
I tried to use the extrude functions but with no results at all.
I notice that if I import an .stl file with the same script I use for the
.stp file I can create the prism layer ( the .stl file is created from the
previous .stp file).
Thank you all for the future answer.
Andrea
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