[Chimera-users] [SPAM?] Re: Transparent background

Greg Couch gregc at cgl.ucsf.edu
Thu Dec 20 11:19:51 PST 2007

And just to follow this up.  There was an alpha channel in the file,
it's just all one (opaque).  We will add documentation and/or a warning 
about not using fog if you want background transparency.

 	- Greg

On Thu, 20 Dec 2007, Eric Pettersen wrote:

> Paul sent me this in a separate mail, which seems relevant...
> I've just been able to raytrace with alpha channel by disabling the
> fog in the povray file. I don't know if it has always been
> necessary... if so, sorry for the trouble
> Paul
> --Eric
>                       Eric Pettersen
>                       UCSF Computer Graphics Lab
>                       http://www.cgl.ucsf.edu
> On Dec 17, 2007, at 10:17 AM, Paul Pillot wrote:
>> You can also render your images using PovRay with transparent
>> backgroung as a setting
>> Paul
>> Le 17 déc. 07 à 18:43, Greg Couch a écrit :
>>> On Fri, 14 Dec 2007, Abbas wrote:
>>>> Hi,
>>>> One feature I really appreciated about chimera was the ability to
>>>> make pictures without a background, however recently i realized this
>>>> is not possible anymore I checked out under the effects dialog under
>>>> tools>viewing controls and it give me an error saying this wasn't
>>>> supported. I haven't changed my computer since i first started using
>>>> chimera I have updated to the latest version of chimera available for
>>>> OSX 10.4, I wonder if this is the cause of the problem.
>>>> I would really like to have pictures without backgrounds like I used
>>>> to, I know PyMol lets you do it, but I dislike this program. In any
>>>> case I would greatly appreciate any help/pointers on this issue.
>>>> Thanks in advance. abbas.
>>> Transparent backgrounds depend on the graphics card capabilities
>>> reported
>>> by OpenGL.  On Mac OS X, Apple decided not to support background
>>> transparency (nor full window antialiasing) for OpenGL/X11
>>> applications,
>>> so to use that feature you would have to use the Aqua version of
>>> chimera.
>>> Unfortunately, the chimera's cross-platform user interface toolkit,
>>> Tk,
>>> while improving for Aqua, has gotton worse for chimera, so you'll
>>> have to
>>> use an old version of chimera for Aqua to get transparent backgrounds.
>>> You can also file a bug report with Apple to help them decide to spend
>>> the time to fix it (OpenGL "destination alpha" and multisampling not
>>> supported in X11).
>>> 	Greg Couch
>>> 	UCSF Computer Graphics Lab
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