Function GenerateGaussianIrradianceTable

BakingLab/BakingLab.cpp:911–937

}

static void GenerateGaussianIrradianceTable(float sharpness, const wchar* filePath)
{
    std::string output;

    const uint64 NumPoints = 50;
    for(uint64 pointIdx = 0; pointIdx < NumPoints; ++pointIdx)
    {
        float theta = Pi * pointIdx / (NumPoints - 1.0f);
        Float3 localSGDir = Float3(std::sin(-theta), 0.0f, std::cos(-theta));

        const uint64 SqrtNumSamples = 64;
        const uint64 NumSamples = SqrtNumSamples * SqrtNumSamples;
        float sum = 0.0f;
        for(uint64 sampleIdx = 0; sampleIdx < NumSamples; ++sampleIdx)
        {
            Float2 samplePoint = SampleCMJ2D(int32(sampleIdx), int32(SqrtNumSamples), int32(SqrtNumSamples), int32(pointIdx));
            Float3 sampleDir = SampleCosineHemisphere(samplePoint.x, samplePoint.y);
            sum += std::exp(sharpness * (Float3::Dot(sampleDir, localSGDir) - 1.0f));
        }

        sum *= (Pi / NumSamples);

        output += MakeAnsiString("%f,%f\n", theta, sum);
    }

    WriteStringAsFile(filePath, output);
}

static void GenerateSGInnerProductIrradianceTable(float sharpness, const wchar* filePath)
{