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/**
* Calculates the specular intensity of reflected light.
*
* @name czm_getSpecular
* @glslFunction
*
* @param {vec3} lightDirectionEC Unit vector pointing to the light source in eye coordinates.
* @param {vec3} toEyeEC Unit vector pointing to the eye position in eye coordinates.
* @param {vec3} normalEC The surface normal in eye coordinates.
* @param {float} shininess The sharpness of the specular reflection. Higher values create a smaller, more focused specular highlight.
*
* @returns {float} The intensity of the specular highlight.
*
* @see czm_phong
*
* @example
* float diffuseIntensity = czm_getLambertDiffuse(lightDirectionEC, normalEC);
* float specularIntensity = czm_getSpecular(lightDirectionEC, toEyeEC, normalEC, 200);
* vec3 color = (diffuseColor * diffuseIntensity) + (specularColor * specularIntensity);
*/
float czm_getSpecular(vec3 lightDirectionEC, vec3 toEyeEC, vec3 normalEC, float shininess)
{
vec3 toReflectedLight = reflect(-lightDirectionEC, normalEC);
float specular = max(dot(toReflectedLight, toEyeEC), 0.0);
return pow(specular, shininess);
}
Version data entries
11 entries across 11 versions & 1 rubygems