Method SampleSky

SampleFramework11/v1.02/Graphics/Skybox.cpp:404–424

}

Float3 Skybox::SampleSky(const SkyCache& cache, Float3 sampleDir)
{
    Assert_(cache.StateR != nullptr);

    float gamma = AngleBetween(sampleDir, cache.SunDirection);
    float theta = AngleBetween(sampleDir, Float3(0, 1, 0));

    Float3 radiance;

    radiance.x = float(arhosek_tristim_skymodel_radiance(cache.StateR, theta, gamma, 0));
    radiance.y = float(arhosek_tristim_skymodel_radiance(cache.StateG, theta, gamma, 1));
    radiance.z = float(arhosek_tristim_skymodel_radiance(cache.StateB, theta, gamma, 2));

    // Multiply by standard luminous efficacy of 683 lm/W to bring us in line with the photometric
    // units used during rendering
    radiance *= 683.0f;

    radiance *= FP16Scale;

    return radiance;
}

}