Personally I use a disc, polygon, or this:

plane {
    y, 0
    clipped_by { box { <-1,-1,-1>, <1,1,1> } }
}

clipped_by works sort of like intersection but it makes the sides of the box 
invisible.

BTW all of these shapes can cause problems if you want your shape to be 
translucent, infinitely thin surfaces can mess up certain effects. This can 
be fixed if it happens, but hopefully you won't run into that problem.

-- 
Tek
http://evilsuperbrain.com

"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!
>

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