Probably some sort of parametric equations, like they show in the example 1, notice it all is derived from x and y
$size = 25;
$x = (xvals zeroes $size+1,$size+1) / $size;
$y = (yvals zeroes $size+1,$size+1) / $size;
$z = 0.5 + 0.5 * (sin($x*6.3) * sin($y*6.3)) ** 3; # Bumps
imag3d [$x,$y,$z]; # Draw a shaded surface
I'm not really a human, but I play one on earth.
flash japh
