> I saw this picture:
>
http://www.worldpressphoto.nl/index.php?option=com_photogallery&task=view&id=264&type=byname&Itemid=119&bandwidth=high
>
> and was wondering how one might render broken glass as shown here.

Quite complicated stuff. You might want to try and create a mesh of some
sort, maybe by deriving this shattered structure from a function using a
solid-edged crackle pattern (or probably, a mix of several differently
scaled crackles). Cut out the holes with an irregular shape. Either texture
the glass properly or put high-density media inside (which would take
forever though).

In general, things like "breaking glass" are difficult to pull off and there
are universities doing research on this on how to efficiently and properly
get virtual glass for various stuff like CG, simulations, etc. Not only are
you asking a "simple" breaking glass, you want to take on the entire
palette: fractures, cracks, holes... ;-)

-- 
"Tim Nikias v2.0"
Homepage: <http://www.nolights.de>

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