glsl-specular-ward

    1.0.0 • Public • Published

    glsl-specular-ward

    Computes the anisotropic specularity in the Ward model

    Example

    #pragma glslify: wardSpec require(glsl-specular-ward) 
     
    uniform vec3 eyePosition;
    uniform vec3 lightPosition;
     
    uniform float shinyPar, shinyPerp;
     
    varying vec3 surfacePosition;
    varying vec3 surfaceNormal;
    varying vec3 fiberDirection;
     
    void main() {
      //Light and view geometry 
      vec3 eyeDirection = normalize(eyePosition - surfacePosition);
      vec3 lightDirection = normalize(lightPosition - surfacePosition);
     
      //Surface properties 
      vec3 normal = normalize(surfaceNormal);
      vec3 fiberPar = normalize(fiberDirection);
      vec3 fiberPerp = normalize(cross(surfaceNormal, fiberDirection));
     
      //Compute specular power 
      float power = wardSpec(
        lightDirection, 
        viewDirection, 
        normal, 
        fiberPar,
        fiberPerp,
        shinyPar,
        shinyPerp);
     
      gl_FragColor = vec4(power,power,power,1.0);
    }

    Usage

    Install with npm:

    npm install glsl-specular-phong
    

    Then use with glslify.

    API

    #pragma glslify: ward require(glsl-specular-ward) 
    float ward(vec3 lightDir, vec3 eyeDir, vec3 normal, vec3 fiberParallel, vec3 fiberPerpendicular, float shinyParallel, float shinyPerpendicular)

    Computes the specular power in the Phong lighting model.

    • lightDir is a unit length vec3 pointing from the surface point toward the light
    • eyeDir is a unit length vec3 pointing from the surface point toward the camera
    • normal is the unit length surface normal at the sample point
    • fiberParallel is a unit length vector tangent to the surface aligned with the local fiber orientation
    • fiberPerpendicular is a unit length vector tangent to surface aligned with the local fiber orientation
    • shinyParallel is the roughness of the fibers in the parallel direction
    • shinyPerpendicular is the roughness of the fibers in perpendicular direction

    Returns A float representing the specular power

    License

    (c) 2014 Mikola Lysenko. MIT License

    Install

    npm i glsl-specular-ward

    DownloadsWeekly Downloads

    2

    Version

    1.0.0

    License

    MIT

    Last publish

    Collaborators

    • dy
    • archmoj
    • hughsk
    • mikolalysenko
    • substack
    • mattdesl
    • chrisdickinson
    • yoshuawuyts
    • mikkoh
    • rezaali
    • tatumcreative
    • wwwtyro
    • thibauts
    • bpostlethwaite
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