This is a library for generating 2D and 3D coherent noise. It compiles a noise definition script to OpenCL, or it can run it through a simple interpreter in case no OpenCL device is available. A compiled script can then generate noise for a given area and resolution.
The Hexahedra Noise Definition Language is a functional language that supports higher-order functions, lambdas, global variables, and named functions. Here's an example that generates billow noise:
scale(100):fractal(perlin:abs)
First, the noise is scaled so we can see some detail (it's drawn at a
resolution of 1 pixel per unit). The base of the billow noise is created by
running the output of Perlin noise through the abs function. It is then
combined into two octaves of fractal noise. (To make ridge noise, use
perlin:abs:neg.)
Another example, using a checkerboard pattern as the input to 'blend', to alternate between concentric circles (the sine of the distance to origin) and seven octaves of Perlin noise:
scale(250):checkerboard:blend
(
scale(10):distance:sin ,
scale(100):fractal(perlin,7)
)
For an example of how to use the library itself, take a look at the hndl2png utility. It parses an HNDL string and writes a PNG file.
A full description of HNDL is available as a wiki page.
HexaNoise is free software: you can distribute it and/or modify it under the terms of the MIT license.