Isosurface visualisation library ?

From: "Alexander Klinsky" <alex.klinsky \\at// scientist.com>
Subject: Isosurface visualisation library ?
Date: Thu, 15 Jan 1998 21:21:12 +0100

 Dear Colleagues!
 Does anybody know of a free isosurface visualisation library or package
 which allows to color individual parts of the generated
 isosurface ( from a 3D gridded data set ) based on another 3D data set.
 I would like to display ab-initio calculated ESPs (Cube=Potential) on an
 electron density isosurface from a Gaussian94 calculation using the
 Cube=Density keyword.
 It should be callabe from C/C++ and/or Fortran77 and running under
 Unix(Linux) or NT.
 Best regards,
 Alexander Klinsky
 Inst. of pharm. chemistry
 Dep. of odour research
 University of Vienna