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Updating readme.

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Bruce Hill 2017-10-27 19:34:37 -07:00
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README.md
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@ -4,6 +4,15 @@ This is a lua library implementation of 1D, 2D, and 3D [Hill Noise](http://blog.
This random noise function generates continuous approximately uniformly distributed pseudorandom noise
values in the range (0-1) with configurable resolution, level of detail, and shape characteristics.
## API
* `make1d([opts])` Return 1D noise function and 1D noise gradient function.
* `make2d([opts])` Return 2D noise function and 2D noise gradient function.
* `make3d([opts])` Return 3D noise function and 3D noise gradient function.
* `make1dShader([opts])` Return 1D noise shader and 1D noise gradient shader (for use with LÖVE game engine).
* `make2dShader([opts])` Return 2D noise shader and 2D noise gradient shader (for use with LÖVE game engine).
* `make3dShader([opts])` Return 3D noise shader and 3D noise gradient shader (for use with LÖVE game engine).
## Usage
```lua
@ -16,6 +25,7 @@ local dndx,dndy,dndz = noise_gradient(x,y,z)
## Parameters
The noise construction functions all take the following options:
* random: a random number function (default: math.random)
* seed: if "random" is not provided, and the love.math module is loaded, a new
pseudorandom number generator will be used with the specified seed
@ -49,6 +59,7 @@ love.graphics.setShader()
```
The noise gradient shaders populate the RGB channels with:
* for 1D: `sigmoid(2*dn/dx)`, `sigmoid(2*dn/dx)`, `sigmoid(2*dn/dx)`
* for 2D: `sigmoid(1.5*dn/dx)`, `sigmoid(1.5*dn/dy)`, `0`
* for 3D: `sigmoid(4*dn/dx)`, `sigmoid(4*dn/dy)`, `sigmoid(4*dn/dz)`