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glsl-specular-cook-torrance
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Readme
Computes the specular power in the Cook-Torrance model.
#pragma glslify: cookTorranceSpec = require(glsl-specular-cook-torrance)
uniform vec3 eyePosition;
uniform vec3 lightPosition;
uniform float roughness, fresnel;
varying vec3 surfacePosition, surfaceNormal;
void main() {
//Light and view geometry
vec3 viewDirection = normalize(eyePosition - surfacePosition);
vec3 lightDirection = normalize(lightPosition - surfacePosition);
//Surface properties
vec3 normal = normalize(surfaceNormal);
//Compute specular power
float power = cookTorranceSpec(
lightDirection,
viewDirection,
normal,
roughness,
fresnel);
gl_FragColor = vec4(power,power,power,1.0);
}
Install with npm:
npm install glsl-specular-phong
Then use with glslify.
#pragma glslify: cookTorrance = require(glsl-specular-cook-torrance)
float cookTorrance(vec3 lightDir, vec3 eyeDir, vec3 normal, float roughness, float fresnel)
Computes the specular power in the Cook-Torrance
lightDir
is a unit length vec3
pointing from the surface point toward the lighteyeDir
is a unit length vec3
pointing from the surface point toward the cameranormal
is the unit length surface normal at the sample pointroughness
is the surface roughness parameter, between 0 and 1. 0 means surface is perfectly smooth, 1 means surface is mattefresnel
the Fresnel exponent. 0 = no Fresnel, higher values create a rim effect around objectsReturns A float
representing the specular power
(c) 2014 Mikola Lysenko. MIT License
FAQs
Cook-Torrance specular/fresnel lighting term
The npm package glsl-specular-cook-torrance receives a total of 29,759 weekly downloads. As such, glsl-specular-cook-torrance popularity was classified as popular.
We found that glsl-specular-cook-torrance demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 1 open source maintainer collaborating on the project.
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