Function SampleSunLight

BakingLab/PathTracer.cpp:192–204

Computes the difuse and specular contribution from the sun, given a 2D random sample point representing a location on the surface of the light

// Computes the difuse and specular contribution from the sun, given a 2D random sample point
// representing a location on the surface of the light
static Float3 SampleSunLight(const Float3& position, const Float3& normal, RTCScene scene,
                             const Float3& diffuseAlbedo, const Float3& cameraPos,
                             bool includeSpecular, Float3 specAlbedo, float roughness,
                             float u1, float u2, Float3& irradiance)
{
    // Treat the sun as a spherical area light that's very far away from the surface
    const float sunDistance = 1000.0f;
    const float radius = std::tan(DegToRad(AppSettings::SunSize)) * sunDistance;
    Float3 sunLuminance = AppSettings::SunLuminance();
    Float3 sunPos = position + AppSettings::SunDirection.Value() * sunDistance;
    return SampleSphericalAreaLight(position, normal, scene, diffuseAlbedo, cameraPos, includeSpecular,
                                    specAlbedo, roughness, u1, u2, radius, sunPos, sunLuminance, irradiance);
}

// Generates a full list of sample points for all integration types
void GenerateIntegrationSamples(IntegrationSamples& samples, uint64 sqrtNumSamples, uint64 tileSizeX, uint64 tileSizeY,