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## [ff3d-users] How to use plane?

 From: Robert Li Subject: [ff3d-users] How to use plane? Date: Mon, 26 Jan 2004 07:02:03 -0800 (PST)

```Dear Stephane Del Pino,
I have a box with vertices  <0,  0,  0> and < 4, 4,
6  >. I tried to get the planes(z=0,2,4,6) of the box.
Then I set the boundary conditions on them. I failed
with the following errors!
Could you tell me why No cell has reference that
matches (4), which is bottom plane of the box! Do you
have any example used plane?

Thanks
Robert

.........
Reference translation (POV-Ray -> FEM)
(1, 0, 0) -> 1
(0, 1, 0) -> 2
(0, 0, 1) -> 3
(1, 1, 0) -> 4
(0, 1, 1) -> 5
Done
....
Sets 1 References
No cell has reference that matches (4)!
Press any key to continue

>>>>>>>>>POV file>>>>>>>>>
box { <0,  0,  0>, < 4, 4, 6  > pigment { color rgb
<1,0,0> } }
plane  { <0,0,1>, 0 pigment { color rgb <1,1,0> }}
plane  { <0,0,1>, 2 pigment { color rgb <0,0,1> }}
plane  { <0,0,1>, 4 pigment { color rgb <0,1,0> }}
plane  { <0,0,1>, 6 pigment { color rgb <0,1,1> }}

>>>>>>>>>INPUT file>>>>>>>>>
vector n = (20, 20, 30);
//vertex a = (-2, -2, -5);
//vertex b = (2, 2, 1);
vertex a = (-1, -1, -2);
vertex b = (5, 5, 8);

mesh M = structured(n,a,b);

scene S = pov("Tplane.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>) or inside(<1,1,0>)
or inside(<0,1,1>));

solve(u) in O by M  //FDM
{
pde(u)
u=-1 on <0,1,1>;
u=0 on <0,1,0>;
u=1 on <0,0,1>;
u=2 on <1,1,0>;

};
save(medit,"TT",u,M,dos);
save(medit,"TT",M,dos);

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