[Chimera-users] selection line-width

Tom Goddard goddard at sonic.net
Wed Dec 15 10:14:45 PST 2010

  Hi Daniel,

   Looking at the code I think it would not  be too hard to thicken the 
green selection outline.  We can test the appearance with a one line 
modification of the C++ code.  I've added this to the feature request list.


The fact that selected objects don't show a green outline when they are 
under a transparent surface is bug 7777 reported over a year ago.


The technical problem is that the depth buffer is being written when 
drawing transparent surfaces.  This is needed for one-layer transparent 
surfaces (the default for molecular surfaces) but is not required for 
multi-layer transparent surfaces (the default a few years ago).  Even 
for multi-layer transparent surfaces it is desirable to write the depth 
buffer when multiple transparent models are used to minimize incorrect 
transparent object rendering (depth order wrong).

   Here's one idea for a solution.  Green selection outlines could be 
shown even for objects hidden behind opaque surfaces and models.  It 
would be like x-ray vision.  I think this may be nice because when 
selected items are not seen because they are covered it is hard to know 
what is selected.  But it may be confusing to see these x-ray 
silhouettes -- would have to try to know.  I think it is easy to try.


> Hi everyone,
> Two requests that would help with interactive demonstrations to large 
> audiences:
> In preferences/background, the selection mode can be "fill" or 
> "outline". Is it possible to add a line-width option for outline? I 
> want to increase the thickness of a selection outline to make it 
> easier for my students to see when I'm projecting an image, but I 
> don't want to use the fill option and lose residue color information.
> I suspect that's an easy fix, but this one might be more difficult:
> Transparent surfaces are very informative when combined with 
> underlying ribbons or stick representations of atoms. But if a residue 
> is visible beneath a transparent surface, selecting it (via the 
> command line) does not show the selection outline. Is it possible to 
> make that work?
> Thanks,
> Dan
> -- 
> ____________________________
> Daniel Gurnon, Ph. D.
> Assistant Professor of Chemistry
> DePauw University
> Greencastle, IN 46135
> p: 765-658-6279
> e: danielgurnon at depauw.edu <mailto:danielgurnon at depauw.edu>
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> Chimera-users at cgl.ucsf.edu
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