static Color3 finalGathering(KdTree<Photon> *map , Scene& scene , 
							 Intersection& inter , RNG& rng , const Vector3& wo ,
                             int gatherSamples , int knn , Real maxSqrDis)
{
    Color3 res = Color3(0.0 , 0.0 , 0.0);
    for (int i = 0; i < gatherSamples; i++)
    {
		Real pdf;
        Vector3 wi = sampleCosHemisphere(rng.randVector3() , &pdf);
        Ray ray = Ray(inter.p + wi * EPS , wi);

        Intersection _inter;
        
        Geometry *_g = scene.intersect(ray , _inter);

        if (_g == NULL)
            continue;
        
        Color3 tmp = estimate(map , 0 , knn , scene , _inter , -wi , maxSqrDis);

		BSDF bsdf(wi , _inter , scene);
		Real cosine , bsdfPdf;
        Color3 brdf = bsdf.f(scene , wo , cosine , &bsdfPdf);
		if (brdf.isBlack())
			continue;
		pdf *= bsdfPdf;
        res = res + (tmp | brdf) * (cosine / pdf);
    }
    res = res / gatherSamples;
    return res;
}
Example #2
0
void Material::samplePhong(Isect &isect, const Vector3d &out, Vector3d &in, double &pdf) const
{
	in = sampleCosHemisphere(isect.normal());
}