# [Gmsh] Problem extruding 2D mesh

Mikhail Artemyev artemiev.mikhail at gmail.com
Wed Feb 11 16:48:03 CET 2015

```Hi Philipp,

This problem has been discussed just recently
http://www.geuz.org/pipermail/gmsh/2015/009492.html

Best regards,
Mikhail

On Wed, Feb 11, 2015 at 9:32 AM, <gmsh-request at ace20.montefiore.ulg.ac.be>
wrote:

> Hello,
>
> i have a problem in creating my desired mesh for a cube. This is what i
> want to do:
> 1. Creating a plane surface
> 2. Inserting some points on this surface
> 3. Creating a surface mesh where the points from step 2 are considered
> 4. Extruding the surface mesh to a 3d-prism-mesh with several layers
>
> For me it is important that the surface mesh is extruded as a structured
> mesh, because i need nodes vertical under the points inserted in step 2
> for line elements later on.
> This is the script for my test example:
>
>      sl = 100.0; // Geometry parameters
>      a = sl/2.0;
>      Point (0) = {0, 0, 0, 1}; // Point to be included
>      Point (1) = {-a, -a, 0, 10}; // Corner points
>      Point (2) = {a, -a, 0, 10};
>      Point (3) = {a, a, 0, 10};
>      Point (4) = {-a, a, 0, 10};
>      Line (1) = {1,2}; // Lines forming the rectangle
>      Line (2) = {2,3};
>      Line (3) = {3,4};
>      Line (4) = {4,1};
>      Line Loop (5) = {1, 2, 3, 4};
>      Plane Surface (0) = {5}; // Creating the plane surface
>      Point {0} In Surface {0}; // Forcing my important point to be on
> the surface mesh
>      Extrude {0, 0, 10} { Surface {0}; Layers {1}; Recombine; } //
> Extruding
>      Mesh 3; // Meshing
>
> This script creates a mesh and extrudes the surface mesh except the
> elements that are connected to point 0. GMSH says
>      Error   : Could not find extruded vertex (0, 0, 10) in surface 27
> and then repeatedly
>      Info    : Linear search for (0, 0, 0)
>      Error   : Could not find extruded vertex (0, 0, 0)
>
> I am not sure if this is a bug or if the extrude-feature doesn't work
> like i expect or if there is another way to achieve my desired mesh.
>
> Thanks a lot and many greetings,
>
> Philipp
>
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