[Gmsh] Help with rewrite of mesh I/O layer

[Laurent CHAMPANEY]

Christophe Geuzaine a écrit :
> Hi all - We are currently rewriting Gmsh's mesh module, including the
> input/output layer, and I have a few questions for all of you who
> use the UNV ("IDEAS Universal Mesh") mesh file format:
>
> * What should we put in the "physical property", "material" and "color"
> fields? Right now we just put the "elementary" region everywhere, and 7
> (!) in the color field.
>   
"Physical property" is a way to link an element to a  physical property 
(beam section, plate thickness, ...)  and "material"  to material 
property (young's modulus, density, ...) than can be defined elsewhere 
in the  .unv file.
Those informations will be used for the matrix construction, but they 
can also be used for selecting the parts of the mesh to be visualized. I 
think than you can use the same reference the two fields than would be 
related to the "physical" definition in gmsh.

Color codes are just used for screen presentation. The color codes are  
attached.

> * Should we treat the physical groups like in the native MSH file
> format, i.e., if physical groups are defined, only save the elements
> that belong to a physical group? Right now we always save all the elements.
>   
I think than you can save only the physical groups.
> * I don't have access to any program that can read UNV files. Does
> anyone on this list with access to such a program want to volunteer to
> test a alpha-quality version of the new import/export code?
>
>   
I will check

> Thanks,
>
> Christophe
>   
Laurent
> PS: While we're at it, are there any mesh file formats that we should
> implement besides MSH, UNV, MESH (INRIA) and STL? Due to changes in the
> database, we've had to remove the P3D and the GREF formats.
>   
Nastran Bulk Data file format is used a lot...

-- 
Laurent CHAMPANEY - LMT Cachan
61, av du Pt Wilson - 94235 Cachan Cedex
Tel  33 1 47 40 53 30 - Fax  33 1 47 40 27 85
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