[Gmsh] Info on tetrahedra

[giuseppe]

Hi Dr.Geuzaine
my name is Giuseppe and I'm student of University of Bari and I'm using 
GMSH for the first time, so this is my question :
is possible obtain only tetrahedra in mesh generation and not prism? and 
if yes what?
My case is a simple cube which I'll use with OpenFOAM:

Point(1) = *{*0,0,0,0.1*}*;
Point(2) = *{*1,0,0,0.1*}*;
Point(3) = *{*1,1,0,0.1*}*;
Point(4) = *{*0,1,0,0.1*}*;
Line(1) = *{*1,2*}*;
Line(2) = *{*2,3*}*;
Line(3) = *{*3,4*}*;
Line(4) = *{*4,1*}*;
Line Loop(5) = *{*1,2,3,4*}*;
Ruled Surface(6) = *{*5*}*;
  Extrude *{*0,0,0.45*}* *{*
  Surface*{*6*}*;
*}*


Physical Surface(101) = *{*6,19,27,28,15,23*}*;
Physical Volume(100) = *{*1*}*;

Thanks and sorry if my question is stupid.
Giuseppe

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