https://github.com/hughsk/glsl-directional-light

A reusable GLSL directional light function
https://github.com/hughsk/glsl-directional-light

Last synced: about 2 months ago
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A reusable GLSL directional light function

• Host: GitHub
• URL: https://github.com/hughsk/glsl-directional-light
• Owner: hughsk
• License: mit
• Created: 2014-04-27T18:09:17.000Z (over 10 years ago)
• Default Branch: master
• Last Pushed: 2014-04-27T18:16:02.000Z (over 10 years ago)
• Last Synced: 2024-04-24T00:43:53.145Z (5 months ago)
• Language: C
• Homepage: http://hughsk.github.io/glsl-directional-light
• Size: 262 KB
• Stars: 13
• Watchers: 4
• Forks: 1
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE.md

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README

        
# glsl-directional-light [![experimental](http://hughsk.github.io/stability-badges/dist/experimental.svg)](http://github.com/hughsk/stability-badges) #

A reusable GLSL directional light function.

The simplest case is to simply use:

``` glsl

dot(normal, direction) * light

```

But this module also takes into account specualrity as well.

[view demo](http://hughsk.io/glsl-directional-light)

[![glsl-directional-light](http://imgur.com/vbOZta5.png)](http://hughsk.io/glsl-directional-light)

## Usage ##

[![glsl-directional-light](https://nodei.co/npm/glsl-directional-light.png?mini=true)](https://nodei.co/npm/glsl-directional-light)

Exports `vec3 directional_light()`, which takes the following arguments:

* `vec3 normal`: This point's normal vector.

* `vec3 light`: The light color.

* `vec3 surface`: The color of the material/surface being drawn.

* `vec3 lightDirection`: The direction of the light to cast – normalized.

* `mat4 modelMatrix`: The model matrix.

* `mat4 viewMatrix`: The view matrix.

* `vec3 viewPosition`: The position of the camera in world space.

If you wish to include specular lighting too, simply add these two extra

parameters when calling the function:

* `float shininess`: Set to lower values for matte, higher for gloss.

* `float specularity`: The amount by which to scale the specular light cast on

  the object.

## License ##

MIT. See [LICENSE.md](http://github.com/hughsk/glsl-directional-light/blob/master/LICENSE.md) for details.