Hello !
Well i've been trying to use some isosurfaces, i copied the exact source
code from a tutorial, and the output image is ugly. Why ??

Here is the code :

#include "colors"
#declare Check1 = pigment {checker color YellowGreen color OrangeRed}
camera {location <2,1.6,1.2> direction z*1 look_at <0,0,0>}
box {-1,1 pigment {White transmit .7} no_shadow} //montre le conteneur
light_source {<40,50,30> White*2}

isosurface {
        function {x*x + y*y + z*0 - 0.5}
        threshold 0
        contained_by {box {-1,1}}
        max_trace 3
        pigment {Check1}
}

And here is the picture :
http://img142.imageshack.us/img142/1672/objets7eo.th.png

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