Nicolas Calimet wrote:
> 
>     This patch is against pov 3.6, for which I doubt there will be any
> such core change.

For integrating this patch into MegaPOV we have to consider 
maintainability.  It is quite possibe that there will be patches 
changing the way images are read in the future.  To add some feature not 
actually extending program usability, just adding some gimmick, at this 
cost is not very good.  So when adding this patch to MegaPOV (which i 
seriously consider - the patch itself is a very interesting and useful 
one) i will most likely remove this part.

> 
>> No but what use has transparency except having a totally transparent 
>> image
> 
> 
>     That's precisely the point.
> 
> (which does not need to be an image anyway).
> 
>     I'd be interested to see how you would use the current background.*
> feature to get transparent background (apart from disabling the default
> checker code or adding support for some extra command / env var).

Quite simple: reserve a certain file name used for the background image 
to be interpreted as plain transparent.  Same can be used for different 
internally generated checkers.  See the ImageMagick built-in 
Images/Patterns for what i mean.

Christoph

-- 
POV-Ray tutorials, include files, Landscape of the week:
http://www.tu-bs.de/~y0013390/ (Last updated 24 Jul. 2005)
MegaPOV with mechanics simulation: http://megapov.inetart.net/

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