Christopher James Huff wrote:
> Shadows could only be cast on something behind the object from the light 
> source's point of view. If the "background" is behind everything, 
> including light sources...
> Making it shadowless would probably slightly speed shadow calculations 
> up though.

I was still thinking radiosity, with a sky_sphere giving off light.


About the unwanted backdrop-lighting-the-scene problem, I have thought 
of two possible solutions :

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

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

Povingly,

Philippe

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