"Dave Matthews" <dma### [at] nospamnet> wrote in message
news:4077106a$1@news.povray.org...
> Damn.  Now I have to puzzle this out.  Another Friday afternoon shot.
> Anyway, it's turning cold and windy outside, so I might as well stay put.

Well maybe I can simplify it for you: Render an image with the camera above a
checkered plane, now render the same image with the plane twice as far away from
the camera. if you compare the two images you'll see the squares in the second
one are exactly half the size of the squares in the first.

i.e. it looks identical to if you rendered the plane in the first position with
the squares scaled by 0.5 (provided the centre of scaling is in line with the
camera).

Parallax mapping uses this effect to give the appearance that some points are
lower than others, when they're actually just scaled within the plane.

Are we confused yet? ;)

-- 
Tek
www.evilsuperbrain.com

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