LYGIA Shader Library

preFilteredImportanceSampling (lygia/lighting/common/preFilteredImportanceSampling)

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#ifndef FNC_PRE_FILTERED_IMPORTANCE_SAMPLING
#define FNC_PRE_FILTERED_IMPORTANCE_SAMPLING

float prefilteredImportanceSampling(float ipdf, float omegaP, int numSamples) {
    const float K = 4.0;
    float omegaS = ipdf / float(numSamples);
    float mipLevel = log2(K * omegaS / omegaP) * 0.5; // log4
    return mipLevel;
}

#endif

Check it on Github

#ifndef FNC_PRE_FILTERED_IMPORTANCE_SAMPLING
#define FNC_PRE_FILTERED_IMPORTANCE_SAMPLING

float prefilteredImportanceSampling(float ipdf, float omegaP, int numSamples) {
    const float K = 4.0;
    float omegaS = ipdf / float(numSamples);
    float mipLevel = log2(K * omegaS / omegaP) * 0.5; // log4
    return mipLevel;
}

#endif

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