I had a similar problem involving halos over the last week.  I switched to the
perspective camera to get rid of the problem and didn't think anything of it.
I'll see if I can duplicate it again.

Basically, when I used the orthographic camera, some of the halos went black or
gray (I can't recall).  Switching to the perspective camera fixed it.  IIRC, it
didn't seem to matter how far away the objects were.

Michael
"Gergely Vandor" <ger### [at] vandordatanethu> wrote in message
news:3bdca5eb@news.povray.org...
> Hello,
>
> I must have gone insane or this is a bug I found. Here's the scene:
>
> camera { location <0,1,-1> look_at <0,1,0> angle 30 orthographic }
>
> sphere { 0,1 texture { pigment {color rgb 1} finish {ambient 1} }  }
>
> sphere { <0,1.2,0>,0.18 texture { pigment {color rgb <1,0,0>} finish
> {ambient 1} }  }
>
> sphere { <1.2,0,0>,0.18 texture { pigment {color rgb <0,1,0>} finish
> {ambient 1} }  }
> sphere { <-1.2,0,0>,0.18 texture { pigment {color rgb <0,0,1>} finish
> {ambient 1} }  }
> sphere { <0,-1.2,0>,0.18 texture { pigment {color rgb <1,1,1>} finish
> {ambient 1} }  }
>
> My findings:
> If I comment out the orthographic keyword, the scene renders OK.
> When using an orthographic camera, AND the last three spheres commented out,
> the scene renders OK.
> With the complete source above, the scene returns a black image. POV-Ray
> reports that there were no ray/shape intersections at all.
>
> Sorry if this one is known.
>
> Celeron 300, Win2k SP2, Beta6
>
> Cheers,
>
> Gergely
>
>
>

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