# [Gmsh] error 3 identical points in Qtest

David Colignon David.Colignon at ulg.ac.be
Fri Mar 27 09:48:01 CET 2009

```Hi Timothy,

do you realize that with the characteristic lenght of 0.1, you will generate (1000/0.1)*(250/0.1)*2 = 50000000 triangles
on the largest face of your geometry ?

Cheers,

Dave

--
David Colignon, Ph.D.
Collaborateur Logistique du F.R.S.-FNRS
CÉCI - Consortium des Équipements de Calcul Intensif
ACE - Applied & Computational Electromagnetics
Sart-Tilman B28
Université de Liège
4000 Liège - BELGIQUE
Tél: +32 (0)4 366 37 32
Fax: +32 (0)4 366 29 10
WWW:    http://hpc.montefiore.ulg.ac.be/

Timothy Phung wrote:
> Hi,
>
> I have been trying to create a mesh out of this geo file in gmsh but it gives me an error that there are 3 identical points in Qtest. I am quite new to gmsh. Can someone please point me to where this error may be in my file, which is shown below.
>
> Point(1) = {500, -125, 1, 0.1};
> Point(2) = {500, -125, -1, 0.1};
> Point(3) = {-500, -125, -1, 0.1};
> Point(4) = {-500, -125, 1, 0.1};
> Point(5) = {500, 125, 1, 0.1};
> Point(6) = {500, 125, -1, 0.1};
> Point(7) = {-500, 125, -1, 0.1};
> Point(8) = {-500, 125, 1, 0.1};
> Line (1) = {1, 2};
> Line (2) = {2, 3};
> Line (3) = {3, 4};
> Line (4) = {4, 1};
> Line (5) = {1, 5};
> Line (6) = {2, 6};
> Line (7) = {3, 7};
> Line (8) = {4, 8};
> Line (9) = {5, 6};
> Line (10) = {6, 7};
> Line (11) = {7, 8};
> Line (12) = {8, 5};
> Line Loop (1000014) = {6, 10, -7, -2};
> Plane Surface (14) = {1000014};
> Line Loop (1000016) = {4, 1, 2, 3};
> Plane Surface (16) = {1000016};
> Line Loop (1000018) = {12, 9, 10, 11};
> Plane Surface (18) = {1000018};
> Line Loop (1000020) = {6, -9, -5, 1};
> Plane Surface (20) = {1000020};
> Line Loop (1000022) = {7, 11, -8, -3};
> Plane Surface (22) = {1000022};
> Line Loop (1000024) = {4, 5, -12, -8};
> Plane Surface (24) = {1000024};
> Surface Loop (1000026) = {14, 20, 18, 24, 16, 22};
> Volume (26) = {1000026};
>
>
> Thanks,
>
> -Tim
>
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```