[Gmsh] question about meshing a floating plane inside a cube

[C. D. Wang]

Hi Christophe,

I am trying to mesh a 3D object (e.g. a cube) where it has a plane
floating inside it. I intended to have elements surrounding the plane
without the plane having to cut through any of them. I tried this, first
in 2D (i.e. a straight line enclosed by a square) with attractor line
and transfinite line, and then 3D with transfinite surface and none
worked. I got elements that were cut through by the plane (or the line).
Can you suggest me any method to do this kind of meshing? 

Thank you for your help.

- Cynthia
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// Simple fault input

Mesh.CutPlane = 1;
Mesh.ConstrainedBackgroundMesh = 1;
Mesh.Light = 1;

lcar = 0.1;
lcar2 = 0.08;

Point(0) = {0,0,0,lcar};
Point(1) = {1,0,0,lcar};
Point(2) = {1,1,0,lcar};
Point(3) = {0,1,0,lcar};

Point(10) = {0.2,0.2,0,lcar2};
Point(11) = {0.2,0.8,0,lcar2};
Point(12) = {0.2,0.8,1,lcar2};
Point(13) = {0.2,0.2,1,lcar2};

Line(50) = {0,1};
Line(51) = {1,2};
Line(53) = {2,3};
Line(54) = {3,0};

Line(55) = {10,11};
Transfinite Line(55) = 15 Using Progression 0.0000001;

Line Loop(70) = {50,51,53,54};

Ruled Surface(71) = {70};