/**
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* DOC_TBA
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*
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* @name czm_multiplyWithColorBalance
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* @glslFunction
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*/
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vec3 czm_multiplyWithColorBalance(vec3 left, vec3 right)
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{
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// Algorithm from Chapter 10 of Graphics Shaders.
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const vec3 W = vec3(0.2125, 0.7154, 0.0721);
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vec3 target = left * right;
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float leftLuminance = dot(left, W);
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float rightLuminance = dot(right, W);
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float targetLuminance = dot(target, W);
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return ((leftLuminance + rightLuminance) / (2.0 * targetLuminance)) * target;
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}
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