From 95f76249e57dd24c967d2637ecad30a04507e706 Mon Sep 17 00:00:00 2001
From: Yoel <s73017@beuth-hochschule.de>
Date: Tue, 16 Mar 2021 14:40:32 +0100
Subject: [PATCH] Point Light implemented
---
RayTracer/shape/PointLight.cpp | 26 ++++++++++++++++++++++++++
RayTracer/shape/PointLight.h | 17 +++++++++++++++++
2 files changed, 43 insertions(+)
create mode 100644 RayTracer/shape/PointLight.cpp
create mode 100644 RayTracer/shape/PointLight.h
diff --git a/RayTracer/shape/PointLight.cpp b/RayTracer/shape/PointLight.cpp
new file mode 100644
index 0000000..2c8c56c
--- /dev/null
+++ b/RayTracer/shape/PointLight.cpp
@@ -0,0 +1,26 @@
+#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
diff --git a/RayTracer/shape/PointLight.h b/RayTracer/shape/PointLight.h
new file mode 100644
index 0000000..82a3653
--- /dev/null
+++ b/RayTracer/shape/PointLight.h
@@ -0,0 +1,17 @@
+#pragma once
+
+#include "Light.h"
+
+namespace shapes {
+class PointLight : public Light {
+ public:
+ PointLight(const util::Vec3& emission);
+
+ util::SurfacePoint sampleLight(const cam::Hit& h) const override;
+ util::Vec3 calculateLightEmission(const util::SurfacePoint& p,
+ const util::Vec3& d) const override;
+
+ private:
+ std::shared_ptr<material::Material> material;
+};
+} // namespace shapes
--
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