between the following two pov-codes' results.
I have no idea, hope someone can tell me why two identical objects look
different
one is a simple CSG, the other an isosurface
attached are the results...


///////////Code A start/////////////
#version unofficial MegaPov 0.6
isosurface {
        function {
                if(1 - x,0,1)+
                if(1 - y,0,1)+
                if(1 - z,0,1)+
                if(x + 1,0,1)+
                if(y + 1,0,1)+
                if(z + 1,0,1)
        }
        threshold 0.5
        contained_by { box {<-10,-10,-10>,<10,10,10>}}
        pigment {rgb 1}
}
light_source {<10,14,24> rgb 1}
camera {
        location 3
        look_at 0
        }

//////////code B start//////////////

intersection {
        plane {<1,0,0> , 1}
        plane {<0,1,0> , 1}
        plane {<0,0,1> , 1}
        plane {-<1,0,0> , 1}
        plane {-<0,1,0> , 1}
        plane {-<0,0,1> , 1}
        pigment {rgb 1}
}
light_source {<10,14,24> rgb 1}
camera {
        location 3
        look_at 0
        }

////////END//////////////////

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