"Fractracer" <lg.### [at] gmailcom> wrote:
>
> I've tried to use yours functions but I have an error message:
> Parse Error: Floating-point exception detected in function
> 'f_quartic_normalized'. Your function either attempted a division by zero, used
> a function outside its domain or called an internal function with invalid
> parameters.
> I don't know what happens...

Hum...
I just tried and this have parse error in pov-ray 3.6 truly.

Or you can use below function instead:

#declare f_quartic_normalized=function(var1,var2){
select(
abs(var1)-0.01,
-1,
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)
)
}

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