[Chimera-users] Transparent Ribbon

[Elaine Meng]

Hi Anna,
First make a transparent color, and then use it to color the ribbon.   
There are a few approaches.

(A) Menu way.  Transparent colors can be created interactively in the  
Color Editor
(under Tools... Utilities)
http://www.cgl.ucsf.edu/chimera/docs/UsersGuide/colortool.html

and then Actions... Color... from editor uses that color.  You can  
set the target to
ribbons only if you want (Actions... Color... ribbons).

(B) Command way.  Transparent colors can be created with the command  
"colordef"
http://www.cgl.ucsf.edu/chimera/docs/UsersGuide/midas/colordef.html

for example,
colordef transred 1 0 0 .3
colordef transblue 0 0 1 .3

and then used with the command "color"
http://www.cgl.ucsf.edu/chimera/docs/UsersGuide/midas/colordef.html

for example,
color transred,r :1-10.a
color transblue,r :1-10.b

(you could go back and adjust the colors with colordef at this point  
as needed, and the items will adjust their colors without another  
"color" statement)

The color command can also use the Color Editor color (that color can  
be indicated with the name "fromeditor" or "colorpanel").

This process differs from making a surface transparent for technical  
reasons - in a nutshell, a surface patch has a transparency property  
that is separate from its color, while a ribbon segment does not.
I hope this helps,
Elaine
-----
Elaine C. Meng, Ph.D.                          meng at cgl.ucsf.edu
UCSF Computer Graphics Lab and Babbitt Lab
Department of Pharmaceutical Chemistry
University of California, San Francisco
                      http://www.cgl.ucsf.edu/home/meng/index.html




On Dec 12, 2006, at 7:18 AM, Anna Feldman-Salit wrote:

> Dear All,
>
>  From some reason I cannot find the option of making ribbon
> representation transparent.
> Can you please give me a hint?
>
> Thanks a lot in advance,
>
> Anna
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