> Fantastic.  I've been wanting to know how to do this for years, but good crystal
> geometry has been elusive.

   Thanks... my solution was in fact very easy. The crystal geometry is 
very simple, just 14 triangles for each crystal. The growth orientation 
is controlled by the surface normals, and the widths and heights of each 
one are just random.

> How high do you have to set the max_trace_level?

   Only 9... I found increasing it was an overkill.

--
jaime

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