In article <3a2cca6b@news.povray.org>, Warp <war### [at] tagpovrayorg> 
wrote:

>   AFAIK the sky_sphere works like if it was a sphere of radius 1 with its
> center in the source of the ray.

Actually, the pigment is calculated as if it was on a radius 1 sphere, 
but sky_sphere behaves mostly like a sphere with infinite radius. Since 
it isn't an object, there are some other odd things about it, like it 
can't have a texture, only a pigment, doesn't have an interior, doesn't 
have a surface, etc...it is just an extended "background" feature.


>   A "fake" intersection point could be created from this information.

That's what I said...


>   Of course if this information is used to create a normal vector and thus
> shading, the result will not be the expected.
>   But why limit it anyways?

Why go through a bunch of trouble to get it to partially work, and 
probably slow it down noticeably, when there is already a way to do what 
you want and get correct results? Just put a big hollow sphere, a real 
sphere, around the scene.

-- 
Christopher James Huff
Personal: chr### [at] maccom, http://homepage.mac.com/chrishuff/
TAG: chr### [at] tagpovrayorg, http://tag.povray.org/

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