Added spot lights.

Makefile

@@ -1,6 +1,6 @@
 CXX = g++
 TARGET = ray
-OBJECTS = main.o disk.o plane.o sphere.o directional_light.o phong_brdf.o point_light.o tracer.o path_tracer.o whitted_tracer.o
+OBJECTS = main.o disk.o plane.o sphere.o directional_light.o phong_brdf.o point_light.o spot_light.o tracer.o path_tracer.o whitted_tracer.o
 DEPENDS = $(OBJECTS:.o=.d)
 CXXFLAGS = -ansi -pedantic -Wall -DGLM_FORCE_RADIANS -fopenmp
 LDLIBS = -lfreeimage

main.cpp

@@ -19,6 +19,7 @@
 #include "light.hpp"
 #include "directional_light.hpp"
 #include "point_light.hpp"
+#include "spot_light.hpp"
 #include "tracer.hpp"
 #include "path_tracer.hpp"
 #include "whitted_tracer.hpp"

spot_light.cpp

@@ -0,0 +1,49 @@
+#include <glm/glm.hpp>
+#include <glm/gtc/constants.hpp>
+
+#include "spot_light.hpp"
+
+using glm::pi;
+using glm::reflect;
+using glm::length;
+using glm::normalize;
+using glm::dot;
+using glm::pow;
+using glm::max;
+using glm::acos;
+using glm::radians;
+
+vec3 SpotLight::diffuse(vec3 normal, Ray & r, vec3 i_pos, Material & m) const {
+  float d, att, spot_effect;
+  vec3 l_dir, ref;
+
+  l_dir = m_position - i_pos;
+  d = length(l_dir);
+  l_dir = normalize(l_dir);
+  spot_effect = dot(m_spot_dir, -l_dir);
+  
+  if (acos(spot_effect) < radians(m_spot_cutoff)) {
+    spot_effect = pow(spot_effect, m_spot_exponent);
+    att = spot_effect / (m_const_att + (m_lin_att * d) + (m_quad_att * (d * d)));
+    return att * m.m_brdf->diffuse(l_dir, normal, r, m_diffuse);
+
+  } else
+    return vec3(0.0f);
+}
+
+vec3 SpotLight::specular(vec3 normal, Ray & r, vec3 i_pos, Material & m) const {
+  float d, att, spot_effect;
+  vec3 l_dir, ref;
+
+  l_dir = m_position - i_pos;
+  d = length(l_dir);
+  l_dir = normalize(l_dir);
+  spot_effect = dot(m_spot_dir, -l_dir);
+
+  if (acos(spot_effect) < radians(m_spot_cutoff)) {
+    spot_effect = pow(spot_effect, m_spot_exponent);
+    att = spot_effect / (m_const_att + (m_lin_att * d) + (m_quad_att * (d * d)));
+    return att * m.m_brdf->specular(l_dir, normal, r, m_specular, m.m_shininess);
+  } else
+    return vec3(0.0f);
+}

spot_light.hpp

@@ -0,0 +1,29 @@
+#pragma once
+#ifndef SPOT_LIGHT_HPP
+#define SPOT_LIGHT_HPP
+
+#include <glm/glm.hpp>
+
+#include "point_light.hpp"
+
+using glm::vec3;
+using glm::normalize;
+
+class SpotLight: public PointLight {
+public:
+  float m_spot_cutoff;
+  float m_spot_exponent;
+  vec3 m_spot_dir;
+
+  SpotLight(): PointLight(), m_spot_cutoff(45.0f), m_spot_exponent(0.0f), m_spot_dir(vec3(0.0f, -1.0f, 0.0f)) { }
+
+  SpotLight(vec3 _p, vec3 _d, vec3 _s, float _c, float _l, float _q, float _sco, float _se, vec3 _sd): PointLight(_p, _d, _s, _c, _l, _q),
+												       m_spot_cutoff(_sco),
+												       m_spot_exponent(_se),
+												       m_spot_dir(normalize(_sd)) { }
+
+  virtual vec3 diffuse(vec3 normal, Ray & r, vec3 i_pos, Material & m) const;
+  virtual vec3 specular(vec3 normal, Ray & r, vec3 i_pos, Material & m) const;
+};
+
+#endif