I'm not sure it's exactly what you're looking for, but this seems similar:

http://hollow.sourceforge.net/

On Tue, May 27, 2008 at 4:53 PM, Thomas S. Leyh, Ph. D. <leyh@aecom.yu.edu> wrote:
     From time to time I find it valuable to view the suface of a ligand-binding pocket looking out from the surface's interior.   This is accomplished in a variety of ways - principally, zooming and clipping.  It would be wonderful to be able to represent just the "skin" of the active site wrapping around the ligands, like a sac - this seems quite difficult to achieve.  A related problem is that ray-ing a surface that has been clipped yields a collection of odd surface regions that represent poorly the non-ray-ed version - it is as if the resolution of the ray it too gross to capture the clipping edges.
 
   Advice appreciated.
 
    Thanks,
 
    Tom Leyh

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Michael Lerner, Ph.D.
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