> Gilles Tran <gitran_nospam_@wanadoo.fr> wrote:
>> AFAIK, instantiation is not a property of the file format, but a feature of 
>> the renderer.
> 
>   If you tell the renderer "copy this mesh 1000 times over the scene" (but
> the mesh data is kept only once in memory), thus getting a nice scene, and
> then you want to save this scene into a file, how do you do that if the
> file format doesn't support saying "copy this mesh here" commands?
> 

Keeping it only once in memory is a feature of the renderer, which 
requires such a command on the file format. Having the triangle list 
only once in the input file is a feature of the file format. A (quite) 
stupid parser could duplicate data in memory even if it's not duplicated 
on the file!

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