From one structure to another

["John R. Nash" <nash &$at$& chem.wisc.edu>]

         I am seeking a utility that will take as input the cartesian coordinates
 of compounds A and B and generate x number of intermediate structures in
 between the two by interpolation (i.e. morphing from one structure to the
 other). I know that some packages will do this sort of thing for "linear
 synchronous transit" calculations, but I need the input files for a
 computation where this is not included.  (The molecule is way too big for
 GAUSSIAN... could the program perhaps be convinced to calculate the
 coordinates w/o running the qm calculation on them?)  This seems like an
 simple enough utility to write, but my guess is that it must have been done
 by someone...
         Thanks in advance!
                 -john nash
 -==-John R. Nash-==-nash &$at$& chem.wisc.edu-==-Dept of Chemistry,
 UW-Madison-==-