Lambertian diffuse lighting for GLSL
npm install glsl-diffuse-lambertA simple Lambertian diffuse lighting model (somewhat trivial, but included for completeness).
``glsl
#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);
}
`
Install with npm:
`
npm install glsl-diffuse-lambert
Then use with glslify.
`glsl`
#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 lightnormal
is the unit length* surface normal at the sample point
Returns A float` representing the diffuse light intensity