#http://www.mathcurve.com/surfaces/algebricsu/algebricsu.shtml

vertices = dimension1:101 dimension2:101

x = from (-1.2) to (1.2) dimension1
z = from (-1.2) to (1.2) dimension2

a = (x*x + z*z)

y = x*x*z*z - a*a*a

y = y + 2
