Spectrum PointLight::sample_ray_radiance(const Scene&,
Ray& out_ray, Normal& out_nn, float& out_pdf,
LightRaySample sample) const
{
Vec3 wi = uniform_sphere_sample(sample.uv_dir.x, sample.uv_dir.y);
out_ray = Ray(this->pt, Vector(wi), 0.f);
out_nn = Normal(wi);
out_pdf = uniform_sphere_pdf();
return this->intensity;
}
virtual float3 sample_direct(UniformRandomGenerator & gen, const float3 & P, float3 & Wi, float & pdf) const override final
{
Wi = normalize(lightPos - P) * uniform_sphere({ gen.random_float(), gen.random_float() }); // comment the sphere sample for hard shadows
pdf = uniform_sphere_pdf();
return intensity / distance2(lightPos, P);
}
float SphereShape::point_pdf(const Point&) const {
return uniform_sphere_pdf() / this->area();
}
