[Gmsh] Translating points after extrusion

[Christophe Geuzaine]

Hi Jose,

Extrude + Layers will not work if you modify the geometry : the extrusion direction (translation, rotation, etc.) is used as-is when creating the structured mesh. You will have to resort to the "Transfinite" command in that case.

Christophe

> On 05 Jul 2016, at 17:06, Jose A. Abell M. <jaabell at miuandes.cl> wrote:
> 
> Dear gmsh devs,
> 
> Suppose I want to create a skewed hexahedral geometry to be meshed using a structured method. I want to use extrusions to create a regular cube first and then translating the points created by the extrusion to 'skew' it. 
> 
> Translating the extruded points and lines works, but the surfaces and volumes created by extrusion seem attached to their old geometry, generating errors. 
> 
> Please see example below:
> 
> //Create 1x1x1 cube using extrusions
> Point(1) = {0, 0, 0, 1};
> 
> lines[] = Extrude {1, 0, 0}{ 
>     Point{1};
>     Layers{10};
>     Recombine;
> };
> 
> surfaces[] = Extrude {0, 1, 0}{ 
>     Line{lines[]};
>     Layers{10};
>     Recombine;
> };
> 
> volumes[] = Extrude {0, 0, 1}{ 
>     Surface{surfaces[]};
>     Layers{10};
>     Recombine;
> };
> 
> // Distort the geometry using a translation for point on a face
> 
> Translate {1, 0, 0} {
>   Point{2, 1, 4, 3};
> }
> 
> 
> 
> 
> Saludos/Regards,
> 
> ​--
> José A. Abell M., ​PhD
> Ingeniero Civil 
> Profesor Investigador
> Facultad de Ingeniería y Ciencias Aplicadas
> Universidad de los Andes
> (+56​​)​2​-2412​-​9321
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-- 
Prof. Christophe Geuzaine
University of Liege, Electrical Engineering and Computer Science 
http://www.montefiore.ulg.ac.be/~geuzaine

Tetrahedron V, July 4-5 2016: http://tetrahedron.montefiore.ulg.ac.be
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