cos(t)*((b*x) + (a*y)) - c: Plane in space
a*cos(t)*(x^2 + y^2) - c: Rotational paraboloid
cos(t)*((b*x)^2 + (a*y)^2) - c: General paraboloid
cos(t)*((b*x)^2 - (a*y)^2) - c: Parabolic saddle
sqrt((a)^2*abs(cos(t)) - x^2 - y^2): Sphere
sqrt((b*c)^2*abs(cos(t)) -((c+1)*x)^2 - (c*y)^2): Rotational ellipsoid
sqrt(a*b - b*x^2 - a*y^2): General ellipsoid
sqrt(a*cos(t)^2 + x^2 + y^2)-c: Rotational hyperboloid
sqrt(a^2 + b*x^2 + c*y^2)-p: General hyperboloid
sqrt(a^2 - cos(t)*(b*x^2 - c*y^2)): Elliptic-hyperbolic saddle
cos(t)*x*y: Hyperbolic saddle
a*(sin(pi*x+t)+sin(-pi*x+t)): Standing wave
a*sin(pi*(x^2+y^2)-t)/sqrt(0.1+x^2+y^2): radial surface wave
receding as 1/r