# [Gmsh] Embedding a line in a surface

Wed Oct 31 00:49:17 CET 2018

Hi,

I've been looking at some topics about how to embed a line in a surface.
What I found is the command Line{ } In Surface{ };

It seems to work fine as long as I don't transfinite the surface in which
I'm embedding the line to.

The code is as follows:
// Start of the Script:
// Points:
Point(1) = {0, 0, 0};
Point(2) = {2, 0, 0};
Point(3) = {2, 5, 0};
Point(4) = {0, 5, 0};
Point(5) = {1, 2.5, 0};
Point(6) = {1, 0.5, 0};

// Lines:
Line(1) = {1, 2};
Line(2) = {2, 3};
Line(3) = {3, 4};
Line(4) = {4, 1};

// Surface:
Line Loop(1) = {1, 2, 3, 4};
Plane Surface(1) = {1};
//Transfinite Surface {1} = {1, 2, 3, 4} Right;

Line(5) = {6, 5};
//Transfinite Line{5}   = 3;
Line{5} In Surface{1};

// Recombine triangular mesh into quadrangular:
Recombine Surface{1};

// Set element order to quadratic:
Mesh.ElementOrder=2;
Mesh.SecondOrderIncomplete=0;

// Duplicate Nodes:
Geometry.Tolerance = 1e-3;
Coherence Mesh;

// End of the Script

If you don't want to run the script, here's what happens:
If I use Line{} In Surface{} without transfiniting the surface, there's no
overlapping of the points that define the line.
If I do use Line{} In Surface{} - and this time transfiniting the surface -
GMSH puts other points over the line, overlapping the preceding ones.

Does anyone have any explanation for that?

--

*Bernardo Augusto Opolski*

*Engenheiro Civil - UFPR*
*Mestrando no Programa de Pós-Graduação em Engenharia de Construção Civil -
UFPR*
*Aluno de Pós-Graduação em Estruturas Protendidas - IDD*
(41) 9 9673 9741
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