Using your second option, you may use BooleanFragments.
Try at the end of your file:
// Surface{7,8,9,10,11,12} In Volume{1}; // Comment out this line
Physical Volume(100) = {1};
aux() = BooleanFragments{ Volume{1}; Delete; }{ Surface{7:12}; Delete;};
Printf("", aux()); // For checking the numbers of the generated geometrical
entities
// For visibility
Recursive Color Red{Volume{1};}
Recursive Color Yellow{Surface{7:12};}
With regard to your first option, you can only create rectangles in the XY
plane, but you can translate and rotate to place them where you want.
HTH
Ruth
—
Prof. Ruth V. Sabariego
KU Leuven
Dept. Electrical Engineering ESAT/Electa, EnergyVille
http://www.esat.kuleuven.be/electa
http://www.energyville.be
Free software: http://gmsh.info | http://getdp.info | http://onelab.info
On 8 Feb 2018, at 22:13, Sathyanarayan Rao
<sathyanarayan....@uclouvain.be<mailto:sathyanarayan....@uclouvain.be>> wrote:
Dear GMSH team,
I am trying to generate a cube with each face having a rectangular surface that
will be later identified as a sensor.
1) In case I want to use rectangle command of opencascade is it possible to
create rectangle other than in XY plane ?
```
SetFactory("OpenCASCADE");
Mesh.Algorithm3D = 4; // 3D mesh algorithm (1=Delaunay, 4=Frontal, 5=Frontal
Delaunay, 6=Frontal Hex, 7=MMG3D, 9=R-tree)
R = 0.05;
w = R;
Box(1) = {-R,-R,-R, 2*R,2*R,2*R};
Rectangle(10) = {-R/2,-R/2,-R, R,R};
Rectangle(11) = {-R/2,-R/2,R, R,R};
```
2) When I manually create surfaces in each face of the cube, they come as
separate regions in 3D mesh.
```
SetFactory("OpenCASCADE");
Mesh.Algorithm3D = 4; // 3D mesh algorithm (1=Delaunay, 4=Frontal, 5=Frontal
Delaunay, 6=Frontal Hex, 7=MMG3D, 9=R-tree)
R = 0.05;
R1 = R;
w = R;
Box(1) = {-R,-R,-R, 2*R,2*R,2*R};
q = 0.005;
/* Right electrode */
RE = 300;
Point(RE+1) = { R1, R1/2, R1/2, q};
Point(RE+2) = { R1, -R1/2, R1/2, q};
Point(RE+3) = { R1, -R1/2, -R1/2, q};
Point(RE+4) = { R1, R1/2, -R1/2, q};
Line(RE+13) = {RE+4, RE+1};
Line(RE+14) = {RE+1, RE+2};
Line(RE+15) = {RE+2, RE+3};
Line(RE+16) = {RE+3, RE+4};
Line Loop(RE+7) = {RE+16, RE+13, RE+14, RE+15};
Plane Surface(7) = {RE+7};
Physical Surface(10000) = {7};
/* Left electrode */
RE = 400;
Point(RE+1) = { -R1, R1/2, R1/2, q};
Point(RE+2) = { -R1, -R1/2, R1/2, q};
Point(RE+3) = { -R1, -R1/2, -R1/2, q};
Point(RE+4) = { -R1, R1/2, -R1/2, q};
Line(RE+13) = {RE+4, RE+1};
Line(RE+14) = {RE+1, RE+2};
Line(RE+15) = {RE+2, RE+3};
Line(RE+16) = {RE+3, RE+4};
Line Loop(RE+7) = {RE+16, RE+13, RE+14, RE+15};
Plane Surface(8) = {RE+7};
Physical Surface(10001) = {8};
// create plate electrodes
/* back electrode */
RE = 500;
Point(RE+1) = { R1/2, -R1, R1/2, q};
Point(RE+2) = { -R1/2, -R1, R1/2, q};
Point(RE+3) = { -R1/2, -R1,-R1/2, q};
Point(RE+4) = { R1/2, -R1, -R1/2, q};
Line(RE+13) = {RE+4, RE+1};
Line(RE+14) = {RE+1, RE+2};
Line(RE+15) = {RE+2, RE+3};
Line(RE+16) = {RE+3, RE+4};
Line Loop(RE+7) = {RE+16, RE+13, RE+14, RE+15};
Plane Surface(9) = {RE+7};
Physical Surface(10002) = {9};
/* front electrode */
RE = 600;
Point(RE+1) = { R1/2, R1, R1/2, q};
Point(RE+2) = { -R1/2, R1, R1/2, q};
Point(RE+3) = { -R1/2, R1,-R1/2, q};
Point(RE+4) = { R1/2, R1, -R1/2, q};
Line(RE+13) = {RE+4, RE+1};
Line(RE+14) = {RE+1, RE+2};
Line(RE+15) = {RE+2, RE+3};
Line(RE+16) = {RE+3, RE+4};
Line Loop(RE+7) = {RE+16, RE+13, RE+14, RE+15};
Plane Surface(10) = {RE+7};
Physical Surface(10003) = {10};
/* top electrode */
RE = 700;
Point(RE+1) = { R1/2,R1/2,R1, q};
Point(RE+2) = { -R1/2,R1/2, R1,q};
Point(RE+3) = { -R1/2, -R1/2,R1, q};
Point(RE+4) = { R1/2, -R1/2,R1, q};
Line(RE+13) = {RE+4, RE+1};
Line(RE+14) = {RE+1, RE+2};
Line(RE+15) = {RE+2, RE+3};
Line(RE+16) = {RE+3, RE+4};
Line Loop(RE+7) = {RE+16, RE+13, RE+14, RE+15};
Plane Surface(11) = {RE+7};
Physical Surface(10004) = {11};
/* bottom electrode */
RE = 800;
Point(RE+1) = { R1/2,R1/2,-R1, q};
Point(RE+2) = { -R1/2,R1/2, -R1,q};
Point(RE+3) = { -R1/2, -R1/2,-R1, q};
Point(RE+4) = { R1/2, -R1/2,-R1, q};
Line(RE+13) = {RE+4, RE+1};
Line(RE+14) = {RE+1, RE+2};
Line(RE+15) = {RE+2, RE+3};
Line(RE+16) = {RE+3, RE+4};
Line Loop(RE+7) = {RE+16, RE+13, RE+14, RE+15};
Plane Surface(12) = {RE+7};
Physical Surface(10005) = {12};
Surface{7,8,9,10,11,12} In Volume{1};
Physical Volume(100) = {1};
```
Somehow the command "Surface{} In Volume" seems to not care for what I want.
Please let me know
how can I get a cube with each face having a rectangular surface with its own
physical number.
________________________________
Best Regards,
Sathyanarayan Rao, PhD student
Earth and Life Institute/Environmental Sciences (ELI-e)
Université catholique de Louvain
c.037, Croix du Sud 2, Louvain-la-Neuve, Belgium
Phone: 010473827 ( intercom 73827)
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