> re:  hbonds algorithm, I will research this, including the url you sent
> and current behavior of RasMol & Chime, and get back to you.

If you check out the current source code you can try out
  hbonds on

It works ... but the algorithm is not correct. It builds far too many bonds.

The simple algorithm is based upon distance only:
 - Any paired combination of oxygen and nitrogen
 - less than 3.25 angstroms
 - more than 2.5 angstroms

I realize that this is not correct.

What I don't know is:
 - What are the 'angle' criteria for hbonds
 - Given that there are no hydrogens in the file ... How do
   you calculate the 'angles' from the bonds that are present?
 - Is there other criteria that can be used to eliminate
   candidate oxygen/nitrogen atoms?


Miguel





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