"Chris" <nomail@nomail> wrote:
> Hi,
>
>    I've been trying to add a checkered plane to an image. The plane itself can
> be generated with a POV-Ray file comprising:
>
> camera {
>    perspective
>    location <15, -12, 72>
>    look_at <-1,3,35>
>    sky <1,-1,0>
>    }
> light_source {
>    <50, -20, 35>, color rgb<1.000,1.000,1.000>
>    parallel
>    point_at <0,0,20>
>    }
> plane { <1,-1,-0.1>, -30
>    pigment { checker rgb<0.8, 0.8, 1.0>, rgb<1.0, 1.0, 1.0> scale 20}
>    }
>
> With POV-Ray 3.6.2 under Windows XP (Mac Parallels VM), I see overlapping lines
> of checkers that look like they're going to different perspective points (sorry
> I can't attach a file here, please let me know an e-mail address and I'll be
> happy to send along a PNG of what I see). I was expecting a simple checkered
> plane rather than two overlapping ones. What am I doing wrong here?
>
> Thanks for any help!

It seems to have something to do with specifying the plane using negative
values...

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