`simplex-noise-2d`constant**Exports**(snoise (POSITION #:vec2)) -> #:float

Given a 2D position, return the simplex noise value at that point.

(fractal-snoise (POSITION #:vec2) (OCTAVES #:int) (FREQUENCY #:float) (AMPLITUDE #:float) (PERSISTENCE #:float) (LACUNARITY #:float) -> #:float

Given a 2D position, return the fractal simplex noise value at that point.

`OCTAVES`is the number of octaves of noise to sample,`FREQUENCY`is the frequency of the first octave,`AMPLITUDE`is the amplitude of the first octave,`PERSISTENCE`is the amount by which the frequency is scaled over each octave,`LACUNARITY`is the amount by which the amplitude is scaled over each octave.