"And" <49341109@ntnu.edu.tw> wrote:
> This is another function and picture:
> #declare CSG_OVERLAP=0.000001;
> #declare f_quartic=function(var1,var2){
> pow(var1,4)+2*var1*var1*var2*var2+var1*var1-1
> }
>
> #declare f_quartic_normalized=function(var1,var2){
> f_quartic(var1,var2)
>
/sqrt(16*pow(var1,6)+(48*var2*var2+16)*pow(var1,4)+(16*pow(var2,4)+16*var2*var2+4)*var1*var1)
> }
>
> difference{
> isosurface{
> function{f_quartic(y,x)}
> max_gradient 10
> contained_by{box{<-3,0,-1><3,1.3,3>}}
> all_intersections
> }
> isosurface{
> function{f_quartic_normalized(y,x)+0.04}
> max_gradient 10
> contained_by{box{<-3,0-CSG_OVERLAP,-1-CSG_OVERLAP><3,1.3,3+CSG_OVERLAP>}}
> all_intersections
> }
> }

Ooops! I don't know why but with pov 3.7 it works! Not with 3.6!

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