New to isosurfaces here, great tutorial... one question, (in Povray 3.5),
why does this source code render the side of the iso with a weird effect?
(It seems dependant on the position of the camera... )

#include "textures.inc"
#include "colors.inc"

camera {location <2, 2, -5> look_at <0, 0, 0>}

light_source {<-5, 3, -6> 1}
light_source {<5, 3, -6> 1}

isosurface{
 function{ x+y-z }
 threshold 1
 contained_by{ box{ <-1,-1,-1>,<1,1,1> } }

 texture {pigment {rgb<1, .5, .3>}}
}

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