Hi Steve,
Surfaces 17, 29, and 41 are generated when extruding.
You could recover them via an array e.g. vol[] that would contain each time the
generated volume and surfaces.
Try replacing the four last lines of your code by:
vol[] = Extrude {{0,0,1}, {0,0,0}, Pi/2} { Surface{5}; };
vol[] = Extrude {{0,0,1}, {0,0,0}, Pi/2} { Surface{vol[0]}; };
vol[] = Extrude {{0,0,1}, {0,0,0}, Pi/2} { Surface{vol[0]}; };
vol[] = Extrude {{0,0,1}, {0,0,0}, Pi/2} { Surface{vol[0]}; };
vol[0] is the surface opposite to Surface 5
vol[1] is the volume
vol[2] is the outer surface of the cone
vol[3] is the base of the cone
Regards,
Ruth
On 13 Feb 2013, at 12:55, "Steve Daley" <[email protected]> wrote:
> I am a new user to GMSH. I am having difficulty understanding one of the
> examples.
>
> lc = 0.2;
> Point(1) = {0,0,0,lc};
> Point(2) = {1,0,0,lc};
> Point(6) = {0,0,3,lc};
> Line(1) = {1,2};
> Line(2) = {2,6};
> Line(3) = {6,1};
> Line Loop(4) = {2,3,1};
> Plane Surface(5) = {4};
> Extrude {{0,0,1}, {0,0,0}, Pi/2} { Surface{5}; }
> Extrude {{0,0,1}, {0,0,0}, Pi/2} { Surface{17}; }
> Extrude {{0,0,1}, {0,0,0}, Pi/2} { Surface{29}; }
> Extrude {{0,0,1}, {0,0,0}, Pi/2} { Surface{41}; }
>
> In the example, I can see how Surface{5} is defined and extruded but where
> are Surface {17} {29} and {41} defined.?
>
> Is the fact that the surface numbers are incremented by 12 a function of the
> cone shape ?
>
> I have developed my own example 3D tet mesh and can generate the quarter of
> the shape, (ip to the first of the Extrude lines) but don't know how to do
> the other three quarters to make up the complete mesh.
>
> Any help gratefully received.
>
> Steve Daley
>
>
>
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> [email protected]
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—
Dr. Ir. Ruth V. Sabariego
University of Liege, Electrical Engineering and Computer Science
http://ace.montefiore.ulg.ac.be/
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