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?
Cheers,
Nico
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