This is a problem of max_gradient.

Look at the documentation, chapter 2.3.3.3.10 and 3.4.4

Then, add the line

max_gradient 3

into your isosurface block

news:web.44659be2a18bc2191ba56a630@news.povray.org...
> 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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