On Wed, Apr 7, 2010 at 12:43 PM, Egon Willighagen <
egon.willigha...@gmail.com> wrote:
> Bob,
>
> On Wed, Apr 7, 2010 at 5:37 PM, Robert Hanson <hans...@stolaf.edu> wrote:
> > I'm sure there is. And if VMD is any example, the use of GPUs would
> vastly
> > increase performance. It would be a great project for someone to explore.
> > Since I know nothing about parallel processing, I'm not the one to take
> it
> > on.
>
> How is a Jmol view (Image) currently calculated? Wasn't this done
> pixel by pixel (that's what I remember, but I might be mixing up
> things)? Would it then not be possible to divide the Image into 2
> parts and calculate each in 2 threads (etc)?
>
OK, so that's another possibility. You have to go through all the shapes, of
course, with both processors, and I'm not clear how you would exactly do
that, but I suppose you could somehow cut it apart some way like that.
More probably what you would do is, say, have all the cartoons rendered by
one and all the spacefill by another, etc. Then merge the components. I'd
have to think about how that would work in terms of translucency. For
example, we don't sort the translucent objects to make an approximate order
that I think is necessary for OpenGL (trading pixel-by-pixel accuracy for
object-by-object accuracty). It's been a while since I thought about that.
Instead we use a base plane buffer and a translucent buffer and then do the
pixel ordering pixel by pixel. Either way there are trade-offs. This was
easier on memory and faster. Still, I suppose this might work with multiple
threads. yes, that could work....
Bob
> Egon
>
> --
> Post-doc @ Uppsala University
> Proteochemometrics / Bioclipse Group of Prof. Jarl Wikberg
> Homepage: http://egonw.github.com/
> Blog: http://chem-bla-ics.blogspot.com/
> PubList: http://www.citeulike.org/user/egonw/tag/papers
>
>
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--
Robert M. Hanson
Professor of Chemistry
St. Olaf College
1520 St. Olaf Ave.
Northfield, MN 55057
http://www.stolaf.edu/people/hansonr
phone: 507-786-3107
If nature does not answer first what we want,
it is better to take what answer we get.
-- Josiah Willard Gibbs, Lecture XXX, Monday, February 5, 1900
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