Polynomial Asphere: Implicit Equation for Rotational Symmetric Surfaces

The implicit equation for a Polynomial Asphere is given by:

$F(x, y, z) = z - \sum_{i=0}^{n} \sum_{j=0}^{n-i} a_{i,j} x^i y^j$

where $a_{i,j}$ are parameters and $n$ is the order. This equation represents a rotationally symmetric surface, offering high adjustability and realism.