Added point lights.

Makefile

@@ -1,6 +1,6 @@
 TARGET = ray
-HEADERS = ray.hpp figure.hpp sphere.hpp plane.hpp disk.hpp material.hpp light.hpp directional_light.hpp tracer.hpp 
-OBJECTS = main.o sphere.o plane.o disk.o directional_light.o tracer.o 
+HEADERS = ray.hpp figure.hpp sphere.hpp plane.hpp disk.hpp material.hpp light.hpp directional_light.hpp point_light.hpp tracer.hpp 
+OBJECTS = main.o sphere.o plane.o disk.o directional_light.o point_light.o tracer.o 
 CXX = g++
 CXXFLAGS = -ansi -pedantic -Wall -g -DGLM_FORCE_RADIANS -fopenmp
 LDLIBS = 
@@ -23,6 +23,8 @@ tracer.o: tracer.cpp $(HEADERS)
 
 directional_light.o: directional_light.cpp $(HEADERS)
 
+point_light.o: point_light.cpp $(HEADERS)
+
 .PHONY: clean
 clean:
 	$(RM) $(TARGET) $(OBJECTS)

directional_light.cpp

@@ -1,15 +1,26 @@
+#include <limits>
+
 #include <glm/glm.hpp>
 #include <glm/gtc/constants.hpp>
 
 #include "directional_light.hpp"
 
+using std::numeric_limits;
 using glm::pi;
 using glm::reflect;
 using glm::dot;
 using glm::pow;
 using glm::max;
 
-vec3 DirectionalLight::shade(vec3 normal, Ray & r, Material & m) const {
+inline vec3 DirectionalLight::direction(vec3 point) {
+  return m_position;
+}
+
+inline float DirectionalLight::distance(vec3 point) {
+  return numeric_limits<float>::max();
+}
+
+vec3 DirectionalLight::shade(vec3 normal, Ray & r, float t, Material & m) const {
   float n_dot_l, r_dot_l;
   vec3 color, ref;
 

directional_light.hpp

@@ -18,7 +18,9 @@ public:
     m_specular = _s;
   }
 
-  virtual vec3 shade(vec3 normal, Ray & r, Material & m) const;
+  virtual vec3 direction(vec3 point);
+  virtual float distance(vec3 point);
+  virtual vec3 shade(vec3 normal, Ray & r, float t, Material & m) const;
 };
 
 #endif

light.hpp

@@ -14,11 +14,12 @@ public:
   vec3 m_position;
   vec3 m_diffuse;
   vec3 m_specular;
-  vec3 m_ambient;
 
   virtual ~Light() { }
 
-  virtual vec3 shade(vec3 normal, Ray & r, Material & m) const = 0;
+  virtual vec3 direction(vec3 point) = 0;
+  virtual float distance(vec3 point) = 0;
+  virtual vec3 shade(vec3 normal, Ray & r, float t, Material & m) const = 0;
 };
 
 #endif

main.cpp

@@ -16,6 +16,7 @@
 #include "disk.hpp"
 #include "light.hpp"
 #include "directional_light.hpp"
+#include "point_light.hpp"
 #include "tracer.hpp"
 
 using namespace std;
@@ -94,7 +95,7 @@ int main(int argc, char ** argv) {
     image[i] = new vec3[g_w];
   }
 
-  scene_3(figures, lights, i_model_view);
+  scene_2(figures, lights, i_model_view);
 
   tracer = Tracer(g_h, g_w, g_fov);
 
@@ -228,17 +229,25 @@ static void scene_1(vector<Figure *> & vf, vector<Light *> & vl, mat4x4 & i_mode
 static void scene_2(vector<Figure *> & vf, vector<Light *> & vl, mat4x4 & i_model_view) {
   Sphere * s;
   Plane * p;
-  DirectionalLight * l;
+  PointLight * l;
+
+  s = new Sphere(0.2f, 0.0f, -0.75f, 0.25f);
+  s->m_mat.m_diffuse = vec3(0.0f);
+  s->m_mat.m_specular = vec3(0.0f);
+  s->m_mat.m_rho = 0.1f;
+  s->m_mat.m_refract = true;
+  s->m_mat.m_ref_index = 2.33f;
+  vf.push_back(static_cast<Figure *>(s));
 
   p = new Plane(vec3(0.0f, -1.0f, 0.0f), vec3(0.0f, 1.0f, 0.0f));
   p->m_mat.m_diffuse = vec3(0.0f, 1.0f, 0.0f);
   vf.push_back(static_cast<Figure *>(p));
 
-  p = new Plane(vec3(-1.0f, 0.0f, 0.0f), vec3(1.0f, 0.0f, 0.0f));
+  p = new Plane(vec3(-2.0f, 0.0f, 0.0f), vec3(1.0f, 0.0f, 0.0f));
   p->m_mat.m_diffuse = vec3(1.0f, 0.0f, 0.0f);
   vf.push_back(static_cast<Figure *>(p));
 
-  p = new Plane(vec3(1.0f, 0.0f, 0.0f), vec3(-1.0f, 0.0f, 0.0f));
+  p = new Plane(vec3(2.0f, 0.0f, 0.0f), vec3(-1.0f, 0.0f, 0.0f));
   p->m_mat.m_diffuse = vec3(0.0f, 0.0f, 1.0f);
   vf.push_back(static_cast<Figure *>(p));
 
@@ -250,14 +259,18 @@ static void scene_2(vector<Figure *> & vf, vector<Light *> & vl, mat4x4 & i_mode
   p->m_mat.m_diffuse = vec3(1.0f, 0.0f, 1.0f);
   vf.push_back(static_cast<Figure *>(p));
 
+  p = new Plane(vec3(0.0f, 0.0f, 0.1f), vec3(0.0f, 0.0f, -1.0f));
+  p->m_mat.m_diffuse = vec3(1.0f, 1.0f, 1.0f);
+  vf.push_back(static_cast<Figure *>(p));
+
   s = new Sphere(-0.4f, -0.5f, -1.5f, 0.5f);
   s->m_mat.m_diffuse = vec3(1.0f, 1.0f, 0.0f);
-  s->m_mat.m_rho = 0.4f;
+  s->m_mat.m_rho = 0.9f;
   vf.push_back(static_cast<Figure *>(s));
 
-  l = new DirectionalLight();
-  l->m_position = normalize(vec3(0.0f, 0.0f, 1.0f));
-  l->m_diffuse = vec3(1.0f, 1.0f, 1.0f);
+  l = new PointLight();
+  l->m_position = vec3(0.0f, 0.9f, -1.0f);
+  l->m_diffuse = vec3(1.0f);
   vl.push_back(static_cast<Light *>(l));
 }
 
@@ -279,6 +292,14 @@ static void scene_3(vector<Figure *> & vf, vector<Light *> & vl, mat4x4 & i_mode
   s->m_mat.m_ref_index = 1.33f;
   vf.push_back(static_cast<Figure *>(s));
 
+  s = new Sphere(0.0f, -0.15f, -2.0f, 0.5f);
+  s->m_mat.m_diffuse = vec3(0.0f);
+  s->m_mat.m_specular = vec3(0.0f);
+  s->m_mat.m_rho = 0.0f;
+  s->m_mat.m_refract = true;
+  s->m_mat.m_ref_index = 2.6f;
+  vf.push_back(static_cast<Figure *>(s));
+
   s = new Sphere(2.0f, 0.0f, -2.0f, 1.0f);
   s->m_mat.m_diffuse = vec3(1.0f, 0.0f, 1.0f);
   s->m_mat.m_rho = 0.6f;
@@ -286,6 +307,7 @@ static void scene_3(vector<Figure *> & vf, vector<Light *> & vl, mat4x4 & i_mode
 
   s = new Sphere(-1.0f, 0.25f, -3.25f, 1.0f);
   s->m_mat.m_diffuse = vec3(1.0f, 1.0f, 0.0f);
+  s->m_mat.m_shininess = 20.0f;
   vf.push_back(static_cast<Figure *>(s));
 
   p = new Plane(vec3(0.0f, -1.5f, 0.0f), vec3(0.0f, 1.0f, 0.0f));
@@ -296,16 +318,24 @@ static void scene_3(vector<Figure *> & vf, vector<Light *> & vl, mat4x4 & i_mode
   l = new DirectionalLight();
   l->m_position = normalize(vec3(-1.0f, 1.0f, -1.0f));
   l->m_diffuse = vec3(0.0f, 1.0f, 0.0f);
+  l->m_specular = vec3(0.0f, 1.0f, 0.0f);
   vl.push_back(static_cast<Light *>(l));
 
   l = new DirectionalLight();
   l->m_position = normalize(vec3(0.0f, 1.0f, 1.0f));
   l->m_diffuse = vec3(1.0f, 0.0f, 0.0f);
+  l->m_specular = vec3(1.0f, 0.0f, 0.0f);
   vl.push_back(static_cast<Light *>(l));
 
   l = new DirectionalLight();
   l->m_position = normalize(vec3(1.0f, 1.0f, -1.0f));
   l->m_diffuse = vec3(0.0f, 0.0f, 1.0f);
+  l->m_specular = vec3(0.0f, 0.0f, 1.0f);
+  vl.push_back(static_cast<Light *>(l));
+
+  l = new DirectionalLight();
+  l->m_position = normalize(vec3(0.0f, 1.0f, 0.0f));
+  l->m_diffuse = vec3(0.5f);
   vl.push_back(static_cast<Light *>(l));
 
   i_model_view = inverse(lookAt(eye, center, up));

point_light.cpp

@@ -0,0 +1,40 @@
+#include <glm/glm.hpp>
+#include <glm/gtc/constants.hpp>
+
+#include "point_light.hpp"
+
+using glm::pi;
+using glm::reflect;
+using glm::length;
+using glm::normalize;
+using glm::dot;
+using glm::pow;
+using glm::max;
+
+inline vec3 PointLight::direction(vec3 point) {
+  return normalize(m_position - point);
+}
+
+inline float PointLight::distance(vec3 point) {
+  return length(m_position - point);
+}
+
+vec3 PointLight::shade(vec3 normal, Ray & r, float t, Material & m) const {
+  float d, att, n_dot_l, r_dot_l;
+  vec3 color, i_pos, l_dir, ref;
+
+  i_pos = r.m_origin + t * r.m_direction;
+  l_dir = m_position - i_pos;
+  d = length(l_dir);
+  l_dir = normalize(l_dir);
+  att = 1.0f / (m_const_att + (m_lin_att * d) + (m_quad_att * (d * d)));
+
+  n_dot_l = max(dot(normal, l_dir), 0.0f);
+  color += att * (m.m_diffuse / pi<float>()) * m_diffuse * n_dot_l;
+
+  ref = reflect(l_dir, normal);
+  r_dot_l = pow(max(dot(ref, r.m_direction), 0.0f), m.m_shininess);
+  color += att * m.m_specular * m_specular * r_dot_l;
+
+  return color;
+}

point_light.hpp

@@ -0,0 +1,30 @@
+#pragma once
+#ifndef POINT_LIGHT_HPP
+#define POINT_LIGHT_HPP
+
+#include "light.hpp"
+
+class PointLight: public Light {
+public:
+  float m_const_att;
+  float m_lin_att;
+  float m_quad_att;
+
+  PointLight(): m_const_att(1.0f), m_lin_att(0.0f), m_quad_att(0.0f) {
+    m_position = vec3(0.0f);
+    m_diffuse = vec3(1.0f);
+    m_specular = vec3(1.0f);
+  }
+
+  PointLight(vec3 _p, vec3 _d, vec3 _s, float _c, float _l, float _q): m_const_att(_c), m_lin_att(_l), m_quad_att(_q) {
+    m_position = _p;
+    m_diffuse = _d;
+    m_specular = _s;
+  }
+
+  virtual vec3 direction(vec3 point);
+  virtual float distance(vec3 point);
+  virtual vec3 shade(vec3 normal, Ray & r, float t, Material & m) const;
+};
+
+#endif

tracer.cpp

@@ -77,16 +77,16 @@ vec3 Tracer::trace_ray(Ray & r, vector<Figure *> & v_figures, vector<Light *> &
 
     for (size_t l = 0; l < v_lights.size(); l++) {
       vis = true;
-      sr = Ray(v_lights[l]->m_position, i_pos + n * BIAS);
+      sr = Ray(v_lights[l]->direction(i_pos), i_pos + n * BIAS);
 
       for (size_t f = 0; f < v_figures.size(); f++) {
-	if (v_figures[f]->intersect(sr, _t)) {
+	if (v_figures[f]->intersect(sr, _t) && _t < v_lights[l]->distance(i_pos)) {
 	  vis = false;
 	  break;
 	}
       }
 
-      color += (vis ? 1.0f : 0.0f) * v_lights[l]->shade(n, r, _f->m_mat);
+      color += (vis ? 1.0f : 0.0f) * v_lights[l]->shade(n, r, t, _f->m_mat);
     }
 
     if (_f->m_mat.m_refract)