Hi Mark,

The surface representation of a protein, in PyMol, shows the
"Connolly" surface or the surface that would be traced out by the
_surfaces_ of waters in contact with the protein at all possible
positions.  Also, since PDBs don't have hydrogens, and PyMOL will
calculate the surface for whatever is present, you should add and
render surfaces for a protein with hydrogens.  I think this will give
you the most biophysically relevant representation for you published
image.

Cheers,

-- Jason

On Mon, Jun 28, 2010 at 6:46 PM, Mark A Saper <sa...@umich.edu> wrote:
> If a model is modified, the "rebuild" command does not always update the 
> surface.  For example,
>
>        show lines, theProtein and not elem H
>        show surface
>
>        show lines, elem H
>        rebuild
>
> The surface does not change.  But if I now,
>
>        hide surface
>        show surface
>
> the surface swells slightly to account for the hydrogens.
>
> Is this a bug?  or a feature?  Also, is it appropriate to show surfaces in 
> publication in the presence of the H's?  Or does the 1.4 Å probe sphere that 
> PyMOL uses intended to account for them?
>
> Mark
> _________________________________
> Mark A. Saper, Ph.D.
> Associate Professor of Biological Chemistry
> University of Michigan
> sa...@umich.edu     phone (734) 764-3353     fax (734) 764-3323
>
>
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-- 
Jason Vertrees, PhD
PyMOL Product Manager
Schrodinger, LLC

(e) jason.vertr...@schrodinger.com
(o) +1 (603) 374-7120

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