# [Gmsh] Internal boundary 3D??

Christophe Geuzaine cgeuzaine at ulg.ac.be
Fri Oct 24 19:32:05 CEST 2008

```Micha? Butterweck wrote:
> Hello,
>
> I want to mesh a volume of box with internal surfaces as
> a part of 3D mesh.
> something like this scheme:
>
> Line Loop(19) = {10,12,6,8};
> Plane Surface(20) = {19};
> Line Loop(21) = {11,1,5,-12};
> Plane Surface(22) = {21};
> Line Loop(23) = {9,-3,-7,8};
> Plane Surface(24) = {23};
> Point(9) = {0.5,0.5,0.5,0.1};
> Point(10) = {0.7,0.5,0.5,0.1};
> Point(11) = {0.6,0.7,0.5,0.1};
> Point(12) = {0.5,0.5,0.7,0.1};
> Line(25) = {9,10};
> Line(26) = {10,11};
> Line(27) = {11,9};
> Line(28) = {11,12};
> Line(29) = {12,9};
> Line Loop(30) = {29,-27,28};
> Plane Surface(31) = {30};
> Line Loop(32) = {26,27,25};
> Plane Surface(33) = {32};
> Surface Loop(34) = {20,18,24,16,22,14};
> Volume(35) = {34};
>
> Is this posiible in 3D?

No, not yet. It's on our TODO list.

At the moment you need the internal surfaces to bound some volumes.

> (I  know that is possible in 2D with lines)
>
> Regards,
> Michal
>
>
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>
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--
Prof. Christophe Geuzaine
University of Liege, Electrical Engineering and Computer Science
http://www.montefiore.ulg.ac.be/~geuzaine

```