Parametric Neon
A
d
f
w
\phi
\theta
\begin{pmatrix} x \\ y \end{pmatrix} = d(A \sin(fr - \phi) e^{-w (r - \pi)^{2}} + 1) \begin{pmatrix} \sin(r - \theta) \\ \cos(r - \theta) \end{pmatrix}