Perlin and simple noise generators for Racket.

; Generate 1D/2D/3D Perlin noise
; Always uses a 3D generator in the background
(perlin x [y 0.0] [z 0.0])

; Generate 1D/2D/3D simplex noise
; Always uses a 3D generator in the background
(simplex x [y 0.0] [z 0.0])