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## [ff3d-users] How to get surface mesh of different lays

 From: Robert Li Subject: [ff3d-users] How to get surface mesh of different lays Date: Thu, 22 Jan 2004 14:47:36 -0800 (PST)

```Dear Stephane Del Pino,
Thank you very much. You are so kindness!
I want to use a model which is made of three lays.
I must get surface mesh of different lays, in order to
set different boundary conditions at different faces.
It was said we can use "mesh
s1=surface(<1,0,0>,O1,M);" on Dec. 26,2003 ff3d-users
Archives. However, I failed. Because I can not use
above statement at all according parse.ff.yy . We can
only use "mesh s1=surface(O1,M);".
Therefore, how to set different boundary conditions at
every face?

Robert

REF<<<<<<<<<<<<<<<<input file
vector n = (20, 20, 20);
vertex a = (-2, -2, -5);
vertex b = (2, 2, 1);
mesh M = structured(n,a,b);

scene S = pov(".\\data\\TT.pov");       // the pov-ray file
for the geometry
domain O = domain(S, inside(<1,0,0>) or
inside(<0,1,0>) or inside(<0,0,1>));
mesh  s1=surface(<1,0,0>,O, M);//<<<<Error ???
mesh  s2=surface(<0,1,0>,O, M);//<<<<Error ???
mesh  s3=surface(<0,0,1>,O, M);//<<<<Error ???

solve(u) in M  //FEM
{
pde(u)
- div(grad(u)) = 0;
u = -1  on s1 zmax;
u = 0  on s1 zmin;
u = 1  on s3 zmax;
u = 2  on s3 zmin;
};
save(medit,"TT",u,M,dos);
save(medit,"TT",M,dos);

<<<<<<<POV file
box { <-2,  -2,  -1>, < 2, 2, 1  > pigment { color
rgb <1,0,0> } }
box { <-2,  -2,  -3>, < 2, 2, -1 > pigment {
color rgb <0,1,0> } }
box { <-2,  -2,  -5>, < 2, 2, -3 > pigment {
color rgb <0,0,1> } }

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```

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