[Gmsh] Extrude point numbers

Fri Jun 6 00:19:00 CEST 2008

Oups!

Hello Michael,

As you said, the torus is formed by the extrusion of the four lines 
51,52,53,54.
But the extrusion process of lines creates surfaces.
These surfaces 70,74,78,66 which appear in
Physical Surface(79) = {70,74,78,66};
are created during the extrusion process of lines 51,52,53,54.

But be careful. The surface 66 which appears in the definition of
Physical Surface(79) = {70,74,78,66};
has nothing to do with the Physical Surface(66).
Surface 66 created during extrusion of line 54 is different than the 
Physical Surface(66) made from Surfaces 62 and 61.

You would find help by making the different elements numbers visible:
Tools -> Options... -> Geometry -> Visibility
and check the Point, Line, Surface numbers.

Best regards.
Laurent Schwaederlé

Michael Grant a écrit :
> Hello all,
>
> I am trying to modify the Gmsh and Getdp example of "Torus3d", and while it is
> explicitly listed as a Getdp example my query is with the geometry of the problem.
>
> As I understand it, the torus is formed by specifying four points then linking
> the points together with four lines which are then rotationally extruded
> around a line-point combination.  The lines are combined to form a line loop
> which is then defined as a "Plane surface" and finally defined as a "Physical
> surface" and assigned the number 66.
>
> My query is as follows: around line 100 in torus3d.geo is the statement
> Physical Surface(79) = {70,74,78,66};
>
> And in torus3d.pro the coil region is assigned number 79.
>
> While I can see the origin of the number 66 in the assignment of Physical
> Surface(79), where do the surfaces 70, 74 and 78 arise from?
>
> How could one query the geometry to find this out.  I have tried the "inspect"
> mode with no luck.
>
> Your advice would be greatly appreciated.
>
> Kind regards, Michael Grant.
>
>
>
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