The Steiner surface is an image of the projective plane. It is given as a quadratic map from
the sphere, mapping antipodal points to the same point in R^3.

Steiner Surface Parametric Equations
x = (aa * aa / 2) * (sin(2 * u) * cos(v) * cos(v))
y = (aa * aa / 2) * (sin(u) * sin(2 * v))
z = (aa * aa / 2) * (cos(u) * sin(2 * v))