In article <3ddcaf51@news.povray.org>,
 Philippe Debar <phd### [at] wanadoobe> wrote:

> * backdrop alone  in a light_group (but I do not know if this works with 
> ambient light emmission in radiosity).

I don't think that will have any effect at all.


> * use a no_image, no_reflection clone with ambient -1 (but I fear ugly 
> lighting artifacts)

No need for a -1 ambient, a plain black texture with ambient and diffuse 
0 should do to hide the backdrop from radiosity, assuming no_image 
doesn't also make it invisible to radiosity. As I mentioned though, a 
better solution would just be to not use a backdrop, you'll never get 
correct radiosity, reflections, or refraction that way. A sky_sphere is 
a much better choice.

-- 
Christopher James Huff <cja### [at] earthlinknet>
http://home.earthlink.net/~cjameshuff/
POV-Ray TAG: chr### [at] tagpovrayorg
http://tag.povray.org/

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