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- /**
- * Converts an HSB color (hue, saturation, brightness) to RGB
- * HSB <-> RGB conversion with minimal branching: {@link http://lolengine.net/blog/2013/07/27/rgb-to-hsv-in-glsl}
- *
- * @name czm_HSBToRGB
- * @glslFunction
- *
- * @param {vec3} hsb The color in HSB.
- *
- * @returns {vec3} The color in RGB.
- *
- * @example
- * vec3 hsb = czm_RGBToHSB(rgb);
- * hsb.z *= 0.1;
- * rgb = czm_HSBToRGB(hsb);
- */
- const vec4 K_HSB2RGB = vec4(1.0, 2.0 / 3.0, 1.0 / 3.0, 3.0);
- vec3 czm_HSBToRGB(vec3 hsb)
- {
- vec3 p = abs(fract(hsb.xxx + K_HSB2RGB.xyz) * 6.0 - K_HSB2RGB.www);
- return hsb.z * mix(K_HSB2RGB.xxx, clamp(p - K_HSB2RGB.xxx, 0.0, 1.0), hsb.y);
- }
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