[Gmsh] How to extract surface number from Extrude

[Christophe Geuzaine]

thierry.gilles at tiscali.nl wrote:
> Christophe
> 
> 1) How to extract automatically generated surface numbers to use them 
> in a Physical Surface ?
> 
> Last year you showed me how to extract the surface numbers 
> automatically generated by the functions Symmetry and Rotate by using a 
> vector, for example :
> l1[] = Symmetry {0, 1, 0, 0} { Duplicata{ Surface
> {1,2,9,13,16,19,22,25}; } };
> Physical Surface(2) = - {l1[]};
> 
> The big advantage of this method is that I don't need to have these 
> surfaces generated first, then track them visually one by one and 
> finally copy them manually also one by one in the Phys Surf.. 
> 
> Now I try the same with the fuction Extrude, but it won't work !?
> Can you show me again the best way out ? I send you an extremely 
> simple example that you can modify.
> 

lc=10;

Point(1)  = {-4,0,0,lc};
Point(2)  = {0,-4,0,lc};
Point(5)  = {0,0,0,lc};

Circle(1) = {1,5,2};

l1[] = Extrude {{1,0,0}, {0,0,0},  Pi/2} {
   Line{1};
};

Physical Surface(100) = {-l1[1]};



> 2) Consistent numbering
> 
> Is it possible to ask GMSH to renumber all nodes from a mesh 
> consistently (1,2,3,...) after or before its generation ?
> 

Currently you have to use an external program: for example 
gmsh/utils/misc/mshsort.cpp



> 
> 
> Thank you again
> 
> 
> Thierry GILLES, Ir.
> PhD Student
> Royal Military Academy
> 
> 
> 
> 
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-- 
Christophe Geuzaine
Assistant Professor, Case Western Reserve University, Mathematics
http://www.case.edu/artsci/math/geuzaine