glsl-hemisphere-light

A reusable GLSL hemisphere light function.

view demo

Usage

Exports vec3 hemisphere_light(), which takes the following arguments:

• vec3 normal: This point's normal vector.
• vec3 sky: The "sky" color, cast from above the object.
• vec3 ground: The "ground" color, cast from below the object.
• 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.

Also worth checking out:

• A brief explanation from Udacity.
• Example in three.js.
• The three.js implementation upon which this is based.

License

MIT. See LICENSE.md for details.