by the way, Jmol does not read the PDB

 HYDBND  The HYDBND records specify hydrogen bonds in the entry.

record.

Jmol just takes anything listed in the CONECT record as a hydrogen bond or salt bridge to be an HBOND.

Bob


Jan wrote:

...

my opinion is, this is OK, hbonds should be created visible, as are
single or double bonds.


I agree.

There is some subtle interaction with some of the old rasmol-compatibility
hbond code.

I will investigate.

This is a broader question but ...

Q: Is there ever a reason why someone would want hbonds turned off?

yes, normally they are not shown (simplify the image, less confusing
network), this can be done by
select NoHbondsPart
hbonds off

Q: Why should hbonds ever be treated differently from normal bonds?

these are weak interactions, but numerous

Q: If you read in a file that contains hbonds, do you want them displayed
by default?

yes, predefined hbonds should be seen on load pdb file.
Regards, Jan




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