infiniteperlin.cpp File Reference

Code file for 2D infinite Perlin noise functions. More...

#include <stdlib.h>
#include <stdio.h>
#include <math.h>
#include "Common.h"
#include "MurmurHash3.h"

Functions
unsigned int	h2 (unsigned int x, unsigned int y)
float	infinitenoise2 (float vec[2])
float	InfinitePerlinNoise2D (float x, float y, float alpha, float beta, int n)
	Generate a cell of 2D infinite Perlin noise.

Detailed Description

Infinite Perlin noise uses MurmurHash3 to get the gradients at integer points.

Function Documentation

unsigned int h2	(	unsigned int	x,
		unsigned int	y
	)

A 2D hash function. Hash two dimensions into a single unsigned int using MurmurHash.

Parameters

x	X coordinate of value to be hashed.
y	Y coordinate of value to be hashed.

Returns

Hash of (x, y).

float infinitenoise2

(

float

vec[2]

)

Compute a single octave of infinite 2D noise at a single point.

Parameters

vec	Point at which to evaluate noise.

Returns

Noise value between -1.0 and 1.0.

float InfinitePerlinNoise2D	(	float	x,
		float	y,
		float	alpha,
		float	beta,
		int	n
	)

Compute turbulence, also known as 1/f noise.

Parameters

x	X coordinate.
y	Y coordinate.
alpha	Persistence.
beta	Lacunarity.
n	Side of square grid.

Returns

Scale factor required to bring it down to range [-1, 1].