[Chimera-users] Display at low definition

Tom Goddard goddard at sonic.net
Thu Dec 20 10:40:12 PST 2012


Hi Damien,

   Check the "subdivision quality" value in the Effects dialog (menu 
Tools / Viewing Controls / Effects).  This controls how faceted the atom 
spheres and bond cylinders are.  The default is 1.5.  Higher values give 
smoother appearance but the rendering can become slow depending on the 
speed of your graphics card.  A value of 10 would be high and 0.1 would 
be low.

   There is another factor that can lead to faceted atom spheres. If you 
have many atoms shown as spheres then Chimera will reduce the quality of 
the spheres so that the graphics does not become too slow.  The exact 
rule is that it won't let you use more than 4.5 million triangles for 
the spheres of one molecule if subdivision quality is at its default 
value of 1.5.  For subdivision quality of 10 it would use up to 30 
million triangles (10 x 3 million).  A big sphere might use about 450 
triangles to look smooth, so at subdivision 1.5 you could go up to 
10,000 atoms shown as spheres before quality becomes limited.

     Tom




-------- Original Message --------
Subject: [Chimera-users] Display at low definition
From: Damien Larivière <damien.lariviere at fourmentinguilbert.org>
To: UCSF Chimera Mailing List <chimera-users at cgl.ucsf.edu>
Date: 12/20/12 10:15 AM
> Dear all,
>
> I have a basic question:
>
> In the image below, on the left, the definition of the atoms is quite 
> good, they are perfect spheres.
>
> On the right, they are not anymore. I probably activated something in 
> Chimera, but I'm not able to remember.
>
> May you tell me what to do to get a good definition again?
>
> Many thanks for your help,
>
> Damien
>
>
>
>
> _______________________________________________
> Chimera-users mailing list
> Chimera-users at cgl.ucsf.edu
> http://plato.cgl.ucsf.edu/mailman/listinfo/chimera-users

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