Roxy, you put this up in post # 37:

He has defined a new pow() function that allows a negative number to be raised to a fractional power. Check out the very end of his .C file.
Code:
double power(double f,double p)
{
int sign;
double absf;

sign = (f < 0 ? -1 : 1);
absf = (f < 0 ? -f : f);

if (absf < 0.00001)
return(0.0);
else
return(sign * pow(absf,p));
}
would you explain what a pow() function is? I believe that function is recognised by Openscad

OME