> #declare surftest =
> isosurface {
>   function { pow(x*x+y*y+z*z,3)-pow(3*x*x-y*y-z*z,2)}
> // evaluate 356*Min_factor,  sqrt(356/(356*Min_factor)),  0.7
>   max_gradient 1500
>   all_intersections
>   contained_by { sphere { 0 3}}
>   clipped_by {box {-3 3}}
>   pigment {Red}
>   finish { phong 0.6 reflection 0.2 }
> }


>
> JimT
>

A simplification when using evaluate:

sqrt(356/(356*Min_factor)) = sqrt(1/Min_factor)

In this case, the following should work correctly and should be faster:

#declare Min_factor = 0.6;
evaluate 1500*Min_factor,  sqrt(1/1Min_factor),  0.7


Alain

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