in news:3bd89123@news.povray.org Philippe Debar wrote:

> Very small scene follows. Just comment cameras to see various
> effects. 
>
> camera{location -1*y} // red in the upper half
 I get, red top, green bottom

> camera{location 0*y} // everything grey
 I get, red top, green bottom

> camera{location 0.4*y} // everything grey with a brighter horizontal 
> line 
 I get, blue top, red bottom

> camera{location .5*y} // lower half grey
 I get, blue top, red bottom

> camera{location 1*y} // red in lower half
 I get, blue top, red bottom


Ingo

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