[Chimera-users] cover art

Eric Pettersen pett at cgl.ucsf.edu
Fri Sep 24 15:58:54 PDT 2010

On Sep 24, 2010, at 3:49 PM, Friedman, Simon H. wrote:

> Hey Eric,
> Here is a mockup of the cover.  I have a question for you:  If you  
> look at the helix, there are some very funky shadows that ended up  
> very blocky.  Other shadows are completely smooth.  The helix was  
> rendered in pov using default everything (from Chimera).  Any  
> insights into the blocky shadows?  They are on one strand only!

Hi Simon,
	That's because right now the ribbons are being represented by a bunch  
of triangles.  One of the things on Greg's to-do list is to have them  
represented by NURBS curves, which POV-ray would be able to shadow  
smoothly, but that hasn't happened yet.  For now, you can mitigate the  
blockiness by upping the subdivision quality to 5 or higher.  Control  
of the subdivision quality is in the "Effects" tab of the side view.


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