[vtkusers] Molecule structure

[John Biddiscombe]

> I can confirm that the code is working with the current cvs (from two 
> days ago). It has dramatically helped reduce rendering time for my 
> case (3000-20000 particles). I would be very interested to know 
> if/when you get size sorting to work!

How much is "dramatically"?

Size sorting. Not that hard to do, perhaps you want to have a go 
yourself. I'm assuming you have a scalar array of sizes (one per atom), 
then just sort by either increasing or decreasing size and then do a 
glend glpointsize glbegin in the mapper between changes of size., 
Clearly a size which is related to atomic number (ie integral steps) 
will be most viable, if there are thousands of sizes all 0.00x apart, 
then things are going downhill.

NB. Size sorting is not going to be compatible with any blending unless 
the two simple modes (occlude/accumulate) are used as they don't require 
depth sorting. (I've not implemented depth sort for blending yet, but it 
is planned at some point).

> One caveat. For some reason my computer locks up (X freezes, and I 
> have to log in from another computer to kill it..) about every third 
> time when I try to exit my application with the new 
> OpenGlPolyDataPointSpriteMapper. I am running Debian linux 2.6 with 
> the latest Nvidia display drivers. Have anybody experienced the same 
> problem?

No problems like this for me. But I think I did find a bug that I didn't 
call glDisable(stuff) correctly somewhere and possibly this is leaving 
gl in a funny state, but I  don't really believe it. I can send my 
latest versions if you want just to try.

JB



-- 
John Biddiscombe,                            email:biddisco @ cscs.ch
http://www.cscs.ch/about/BJohn.php
CSCS, Swiss National Supercomputing Centre  | Tel:  +41 (91) 610.82.07
Via Cantonale, 6928 Manno, Switzerland      | Fax:  +41 (91) 610.82.82