I was testing out some of the Isosurfaces from the documentation and came
across some thing which I'm not sure if its a bug, a limitation, or so I'm
just not doing it right.

The code below renders to the attached image. There seems to be some weird
normals, shading, or with the general shape. But if I change the viewing
coordinates to something else like <3,2,5> everything looks fine.

Can anybody tell me what I'm doing wrong or make any suggestions?



#include "colors.inc"

camera {
 location <2,2,2>
 look_at <0,0,0>
}

isosurface{
        function{ abs(x)+abs(y)-1}
        contained_by {box{-1,1}}
        pigment{color White}
}


light_source {
 <2,2,2>
 color White
}

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