# [Gmsh] Medit file format

**Christophe Geuzaine**
cgeuzaine at ulg.ac.be

*Sun Aug 22 17:16:33 CEST 2010*

Hi Geordie - I've comitted the stuff for hexahedra: let me know if it
works...
On 06/05/10 09:40, Geordie McBain wrote:
>* 2010/5/6 Geordie McBain<gdmcbain at freeshell.org>:
*>>* I'll write Pascal Frey and ask him about the vertex ordering of
*>>* hexahedral elements.
*>*
*>* Dr Frey replied:
*>*
*>* Dear Dr Geordie,
*>*
*>* In Medit (mesh format), hexahedral elements are numbered as follows:
*>* suppose vertices 1,2,3,4 are in plane z=0 and 5,6,7,8 in plane z=1
*>* then vertices 1,2,3,4 form a quadrilateral having a normal oriented
*>* toward plane z=1
*>* and vertex 5 is above vertex 1, 6 above 2, etc..
*>* in other words, vertices are labelled quite "intuitively", as
*>* depiected hereafter
*>*
*>*
*>*
*>* Feel free to ask more question if something remains unclear.
*>* Best regards
*>* Pascal
*>*
*>*
*>*
*>* _______________________________________________
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*
--
Prof. Christophe Geuzaine
University of Liege, Electrical Engineering and Computer Science
http://www.montefiore.ulg.ac.be/~geuzaine