Bob, I insist on my congratulations. The look of these sa-surfaces is excellent 
and the ability 
to calculate them from Jmol is a great utility.

Well, I have being working on my interests: surfaces for macromolecules. 
Clearly, calculation 
takes very long, in the tens of minutes for very small macromolecules. 
Sometimes it seems 
Jmol has hung, but I think it's just busy (100% CPU).
Up to now, I have achieved a 17-base pair DNA (701 atoms) and a protein with 
876 atoms. 
Sending the result to console with "show isosurface", then copying the text and 
saving to a  
file, this 17 kb  jvxl file loads quickly, so one can prepare surfaces for 
webpage delivery.
Those interested, take a look at
http://biomodel.uah.es/pruebas/jmol/surface/proto/
(also linked from my page in Jmol Wiki)

For the unbelievers, Chime does this sa-surface business far more quickly 
on-the-fly from the 
pop-up menu, so there has to be a way.
 It would be interesting to find a way to optimize the calculations.




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