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glsl-diffuse-lambert

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