"Simon" <povray@*NOSPAM*SOWare.co.uk> wrote in message 
news:465b3b5b@news.povray.org...
> Anyone know how I can get a plane that is non-infinite? I tried to do an 
> intersection with a box and of course got everything in the box that was 
> below the plane. I really want a lamina...
>
> I'm currently using a VERY narrow box but... Any help appreciated.
>
> Thanks!

Hi Simon,

It depends which infinite dimension you're not happy with and why. If a box 
doesn't do what you want then it sounds like you don't want something 
completely finite. You can make something that's only infinite in certain 
directions by intersecting the desired number of planes.
So, the following example uses 3 planes that give a thin slice that 
stretches away infinitely in the z, x and -x dimensions, but gives a crisp 
edge in the foreground. I've made the top surface slightly translucent so 
you can see the checkered plane beneath.

camera {location <0, 0.8,-2> look_at  <0,0,0>}
light_source { <0, 50, -30> color rgb <1,1,1>}
intersection {
  plane{y,0.01 pigment{color rgbt <1,1,1,0.3>}}
  plane{-y,0.01 pigment{checker}}
  plane{-z,0 pigment{color rgb <1,0,0>}}
}

Regards,
Chris B.

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