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Contents
/**
* Computes the luminance of a color.
*
* @name czm_luminance
* @glslFunction
*
* @param {vec3} rgb The color.
*
* @returns {float} The luminance.
*
* @example
* float light = czm_luminance(vec3(0.0)); // 0.0
* float dark = czm_luminance(vec3(1.0)); // ~1.0
*/
float czm_luminance(vec3 rgb)
{
// Algorithm from Chapter 10 of Graphics Shaders.
const vec3 W = vec3(0.2125, 0.7154, 0.0721);
return dot(rgb, W);
}
Version data entries
12 entries across 12 versions & 1 rubygems