Bob,
Things have certainly improved in the orientation+camera of the vrml exporrt. 
However, I 
wasn't too happy yet ;-). I am testing with 2 models, alanine and lysozyme, and 
the latter is 
still far away (zoomed out)  with respect to Jmol view.

So I've tested different approaches, less dependent on the window coords and 
absolute 
values (like the 5.5*z you used) and more based on the boundbox, and now have 
one which 
looks better in my 2 models (zoom is still a bit low in the small alanine). The 
key seems to 
be to do rotation first to get the molecule orientation, then translation to 
bring it into the 
viewport.

I've applied it to the X3D exporter, so we can compare the result in VRML and 
X3D with 
different molecules. Committed as r11273.

It is yet not perfect, since a third model (a nucleic acid fragment with a 
rather large Z coord 
in its boundbox) still comes zoomed out, but less than in the vrml exporter.
I agree that accuracy is not key here, but as long as the model doesn't go out 
of view.

Please have a look at the code and test too. I will try other molecules.


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