[Gmsh] extrude OpenCASCADE Boolean union doesn't work

[Christophe Geuzaine]

> On 27 Sep 2017, at 14:03, Nico Schlömer <nico.schloemer at gmail.com> wrote:
> 
> Hi everyone,
> 
> The following code forms a union of a rectangle and two disks, and aims to extrude the resulting shape.
> ```
> SetFactory("OpenCASCADE");
> 
> Mesh.CharacteristicLengthMin = 0.1;
> Mesh.CharacteristicLengthMax = 0.1;
> 
> s0 = news;
> Rectangle(s0) = {-1.0, -1.0, 0.0, 2.0, 2.0};
> 
> s1 = news;
> Disk(s1) = {-1.0, 0.0, 0.0, 0.5};
> 
> s2 = news;
> Disk(s2) = {1.0, 0.0, 0.0, 0.5};
> 
> bo1[] = BooleanUnion{Surface {s0}; Delete;} {Surface {s1,s2}; Delete;};
> 
> ex1[] = Extrude{0,0,1}{Surface{bo1};};
> ```
> However, it appears that only the _difference_ between the rectangle and the disks is extruded.
> 
> Any idea what's going on?

The last line should be 

ex1[] = Extrude{0,0,1}{Surface{bo1()};};


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

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