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On Friday 15 October 2004 15:06, [EMAIL PROTECTED] wrote:
> I am in Chicago and don't have full access to my data, but I'd
> like to contribute to this discussion.
>
> CIF Symmetry: The key here should be
>
> loop_
> _symmetry_equiv_pos_site_id
> _symmetry_equiv_pos_as_xyz
>  1 '-x, y, -z+1/2'
>
> etc.
> ----
>
> I'm guessing that any CIF file showing only fractional coordinates
> must contain this record. Someone should look into that. I have
> written code for another program that parses these and can share that.
>
> -translation: Yes, this is an issue. There is no need to "modularize"
> the coordinates in [0,0,0:1,1,1]. Are we doing that?

No, not yet... reason: for some cases you do want to do this, but for 
molecular crystals you do not want to break up molecules, so you want to '
'modularize' the center of mass of the molecules...

> -disorder: One can see, for example, sometimes a CH3 showing up as a CH6.
> It might be nice to show disorder visually.

Yes, I liked to transparent atoms idea...

> -missing atoms: (Peter didn't mention this.) We need to be able to ignore
> atoms that are present in the file but have no coordinates listed. They
> simply can't be put in as 0,0,0 just because parseFloat() returns 0.

Indeed.

Egon

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