From 5db502d77af4fe436926f8cc4e8004677ffa2390 Mon Sep 17 00:00:00 2001
From: Maximilian Giller <m.giller.dev@gmail.com>
Date: Tue, 24 Jan 2023 22:03:33 +0100
Subject: [PATCH] Adds concept of distance to illumination

---
 light/ambientlight.cpp | 2 +-
 light/light.h          | 1 +
 light/pointlight.cpp   | 1 +
 light/spotlight.cpp    | 1 +
 light/sunlight.cpp     | 1 +
 5 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/light/ambientlight.cpp b/light/ambientlight.cpp
index 0bde3bb..bac614d 100644
--- a/light/ambientlight.cpp
+++ b/light/ambientlight.cpp
@@ -1,5 +1,5 @@
 #include "light/ambientlight.h"
 
 Light::Illumination AmbientLight::illuminate(Scene const &scene, Ray const &ray) const {
-  return {this->color * this->intensity, -ray.normal};
+  return {this->color * this->intensity, -ray.normal, 0};
 }
diff --git a/light/light.h b/light/light.h
index 08f5732..6abc093 100644
--- a/light/light.h
+++ b/light/light.h
@@ -13,6 +13,7 @@ public:
   struct Illumination {
     Color color;
     Vector3d direction;
+    float distance;
   };
 
   // Constructor / Destructor
diff --git a/light/pointlight.cpp b/light/pointlight.cpp
index 359352a..fa02b84 100644
--- a/light/pointlight.cpp
+++ b/light/pointlight.cpp
@@ -12,6 +12,7 @@ Light::Illumination PointLight::illuminate(Scene const &scene, Ray const &ray) c
 
   // Precompute the distance from the light source
   float const distance = length(target - this->position);
+  illum.distance = distance;
 
   // Define a secondary ray from the surface point to the light source.
   Ray lightRay;
diff --git a/light/spotlight.cpp b/light/spotlight.cpp
index 3376249..5ef3427 100644
--- a/light/spotlight.cpp
+++ b/light/spotlight.cpp
@@ -13,6 +13,7 @@ Light::Illumination SpotLight::illuminate(Scene const &scene, Ray const &ray) co
 
   // Precompute the distance from the light source
   float const distance = length(target - this->position);
+  illum.distance = distance;
 
   // Define a secondary ray from the surface point to the light source
   Ray lightRay;
diff --git a/light/sunlight.cpp b/light/sunlight.cpp
index c34bdf1..6c6b569 100644
--- a/light/sunlight.cpp
+++ b/light/sunlight.cpp
@@ -12,6 +12,7 @@ Light::Illumination SunLight::illuminate(Scene const &scene, Ray const &ray) con
     // Illumination object
     Illumination illum;
     illum.direction = this->direction;
+    illum.distance = INFINITY;
 
     // Define a secondary ray from the surface point to the light source.
     Ray lightRay;