[Gmsh] MathEval and extrude

[Christophe Geuzaine]

On 14 Jun 2013, at 12:03, Jonathan Mc Govern <mcgovej at gmail.com> wrote:

> Hi there,
> 
> I have a tetrahedral mesh I created with extrude, from a triangular base, in a .geo file. At the moment the domain is rectangular.
>  
> Does anyone know if there is a way in GMSH to set the thickness and surface elevation to vary. In this case, the surface elevation to vary sinusoidally as given by a certain function and a constant slope in the thickness as given by a function. 
> 
> I know there is MathEval - I was wondering if / how this can be used with the tetrahedral mesh I created with extrude, so that the thickness and surface elevation vary. 

There's a little used feature in Extrude, that allows you to extrude using a post-processing view.

If the view contains a vector field, the extrusion is done along this field. If it contains a scalar field, the extrusion is done along the mesh normals, scaled by the field.

Here's an example:

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> Thanks,
> 
> Jonathan
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-- 
Prof. Christophe Geuzaine
University of Liege, Electrical Engineering and Computer Science 
http://www.montefiore.ulg.ac.be/~geuzaine