glsl-diffuse-lambert

A simple Lambertian diffuse lighting model (somewhat trivial, but included for completeness).

Example

#pragma glslify: lambert = require(glsl-diffuse-lambert)

uniform vec3 lightPosition;

varying vec3 surfacePosition, surfaceNormal;

void main() {
  //Light geometry
  vec3 lightDirection = normalize(lightPosition - surfacePosition);

  //Surface properties
  vec3 normal = normalize(surfaceNormal);

  //Compute diffuse light intensity
  float power = lambert(
    lightDirection, 
    normal);

  gl_FragColor = vec4(power,power,power,1.0);
}

Usage

Install with npm:

npm install glsl-diffuse-lambert

Then use with glslify.

API

#pragma glslify: lambert = require(glsl-diffuse-lambert)

float lambert(vec3 lightDir, vec3 normal)

Computes the diffuse intensity in the Lambertian model

• lightDir is a unit length vec3 pointing from the surface point toward the light
• normal is the unit length surface normal at the sample point

Returns A float representing the diffuse light intensity

License

(c) 2014 Mikola Lysenko. MIT License