"hall" <tre### [at] ww-interlinknet> wrote in message
news:39621861@news.povray.org...
> the code:
>
> #version unofficial MegaPOV 0.5;
> light_source { <3,5,-8> 1 shadowless}
> camera{ location  <0,0,-4> look_at   <0,0,0> }
>
> #declare a = function { x*x+y*y+z*z }
>
> isosurface
> {
>  function {a(x,y,z)}
>  contained_by{sphere {0,4}}
>  threshold 1
>  method 1
>  eval
>  pigment{color rgb 1}
>  translate <-1,0,0>
> }
>
> isosurface
> {
>  function {a(x,y,z)}
>  contained_by{sphere {0,4}}
>  threshold 1
>  method 2
>  eval
>  pigment{color rgb 1}
>  translate <1,0,0>
> }
>

Try adding  a max_gradient value - eval should give you the right(ish) val,
but check the output of eval on subsequent renders to get the final correct
val for max_gradient. I had exactly the same problem.

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