PointLight.cpp

#define _USE_MATH_DEFINES

#include "PointLight.h"

#include "../material/BackgroundMaterial.h"
#include "math.h"

namespace shapes {
PointLight::PointLight(const util::Vec3& emission)
    : material(std::make_shared<material::BackgroundMaterial>(emission)) {
}
util::SurfacePoint PointLight::sampleLight(const cam::Hit& h) const {
	return util::SurfacePoint(util::Vec3(0), h.point().normalize(), {},
	                          material);
}
util::Vec3 PointLight::calculateLightEmission(const util::SurfacePoint& p,
                                              const util::Vec3& d) const {
	// Basically this is just the emission at a surface point. And the pdf dimms
	// the light in regard to the angle.
	auto emission = p.emission();
	// Illegally do not divide by area
	// auto area = M_PI * std::pow(radius, 2);
	auto pdf = std::pow(d.length(), 2);
	return emission / pdf;
}
}  // namespace shapes