Added shadow rays.

light.hpp

@@ -13,7 +13,7 @@ public:
   vec3 m_specular;
   vec3 m_ambient;
 
-  Light(): m_position(vec3(0.0f)), m_diffuse(vec3(1.0f)), m_specular(vec3(1.0f)), m_ambient(vec3(0.1f)) { }
+  Light(): m_position(vec3(0.0f)), m_diffuse(vec3(1.0f)), m_specular(vec3(1.0f)), m_ambient(vec3(0.05f)) { }
   Light(vec3 _p, vec3 _d, vec3 _s, vec3 _a): m_position(_p), m_diffuse(_d), m_specular(_s), m_ambient(_a) { }
 };
 

main.cpp

@@ -1,4 +1,5 @@
 #include <iostream>
+#include <iomanip>
 #include <vector>
 #include <cstdio>
 #include <cstdlib>
@@ -38,8 +39,10 @@ int main(int argc, char ** argv) {
   vector<Figure *> figures;
   vector<Light *> lights;
   Tracer tracer;
+  int total;
+  int current = 0;
 
-  if(argc < 2 || argc == 3 || argc > 6) {
+  if(argc < 2 || argc == 3 || argc > 7) {
     cerr << "USAGE: " << argv[0] << " IN FILE [OUT FILE [HEIGHT WIDTH [SAMPLES [FIELD OF VIEW]]]]" << endl;
     return EXIT_FAILURE;
   }
@@ -108,32 +111,64 @@ int main(int argc, char ** argv) {
   figures.push_back(static_cast<Figure *>(s));
 
   p = new Plane(vec3(0.0f, -1.0f, 0.0f), vec3(0.0f, 1.0f, 0.0f));
-  p->set_color(0.0f, 1.0f, 1.0f);
+  p->set_color(1.0f, 0.5f, 0.4f);
   figures.push_back(static_cast<Figure *>(p));
 
+  s = new Sphere(0.0f, 0.0f, -1.0f, 0.25f);
+  s->set_color(1.0f, 1.0f, 1.0f);
+  figures.push_back(static_cast<Figure *>(s));
+
+  s = new Sphere(-1.5f, 0.0f, -2.0f, 0.5f);
+  s->set_color(1.0f, 1.0f, 1.0f);
+  figures.push_back(static_cast<Figure *>(s));
+
+  s = new Sphere(1.5f, 0.0f, -2.0f, 0.5f);
+  s->set_color(1.0f, 1.0f, 1.0f);
+  figures.push_back(static_cast<Figure *>(s));
+
+  s = new Sphere(0.0f, 1.5f, -2.0f, 0.5f);
+  s->set_color(1.0f, 1.0f, 1.0f);
+  figures.push_back(static_cast<Figure *>(s));
+
   l = new Light();
   l->m_position = normalize(vec3(1.0f, 1.0f, 1.0f));
+  l->m_diffuse = vec3(0.0f, 1.0f, 1.0f);
   lights.push_back(l);
 
   l = new Light();
-  l->m_position = normalize(vec3(-1.0f, 0.0f, 0.0f));
+  l->m_position = normalize(vec3(-1.0f, 1.0f, 1.0f));
   l->m_diffuse = vec3(1.0f, 1.0f, 0.0f);
   lights.push_back(l);
 
+  l = new Light();
+  l->m_position = normalize(vec3(0.0f, 1.0f, -1.0f));
+  l->m_diffuse = vec3(1.0f, 0.0f, 1.0f);
+  lights.push_back(l);
+
   tracer = Tracer(g_h, g_w, g_fov);
 
-#pragma omp parallel for schedule(dynamic, 1) private(r, sample)
+  total = g_h * g_w * g_samples;
+
+#pragma omp parallel for schedule(dynamic, 1) private(r, sample) shared(current)
   for (int i = 0; i < g_h; i++) {
     for (int j = 0; j < g_w; j++) {
       for (int k = 0; k < g_samples; k++) {
 	sample = tracer.sample_pixel(i, j);
 	r = Ray(normalize(vec3(sample, -1.0f) - vec3(0.0f, 0.0f, 0.0f)), vec3(0.0f, 0.0f, 0.0f));
 	image[i][j] += tracer.trace_ray(r, figures, lights, MAX_RECURSION);
+#pragma omp critical
+	{
+	  current++;
+	}
       }
-
       image[i][j] /= g_samples;
     }
+#pragma omp critical
+    {
+      cout << "\r" << setw(3) << static_cast<int>((static_cast<float>(current) / static_cast<float>(total)) * 100.0f) << "% done";
+    }
   }
+  cout << endl;
 
   for (size_t i = 0; i < figures.size(); i++) {
     delete figures[i];

sphere.cpp

@@ -5,6 +5,7 @@
 using glm::normalize;
 
 bool Sphere::intersect(Ray & r, float & t) const {
+  float t1, t2;
   float d;
 
   float a = (r.m_direction.x * r.m_direction.x) +
@@ -26,7 +27,9 @@ bool Sphere::intersect(Ray & r, float & t) const {
   d = (b * b) - (4 * a * c);
 
   if (d >= 0.0f) {
-    t = (-b - sqrt(d)) / (2 * a);
+    t1 = (-b - sqrt(d)) / (2 * a); 
+    t2 = (-b + sqrt(d)) / (2 * a);
+    t = t1 < t2 ? t1 : t2;
     return t >= 0.0f;
 
   } else

tracer.cpp

@@ -7,6 +7,8 @@
 
 #include "tracer.hpp"
 
+#define PI 3.14159265358979f
+
 using namespace std;
 
 using std::numeric_limits;
@@ -45,10 +47,12 @@ vec2 Tracer::sample_pixel(int i, int j) const {
 }
 
 vec3 Tracer::trace_ray(Ray & r, vector<Figure *> & vf, vector<Light *> & vl, unsigned int rec_level) const {
+  size_t f_index;
   float t, _t, n_dot_l;
   Figure * _f;
   vec3 n, color, i_pos;
-  vec3 light_dir;
+  Ray sr;
+  bool vis;
 
   t = numeric_limits<float>::max();
   _f = NULL;
@@ -57,17 +61,27 @@ vec3 Tracer::trace_ray(Ray & r, vector<Figure *> & vf, vector<Light *> & vl, uns
     if (vf[f]->intersect(r, _t) && _t < t) {
       t = _t;
       _f = vf[f];
+      f_index = f;
     }
   }
 
-  i_pos = r.m_origin + (t * r.m_direction);
-
   if (_f != NULL) {
+    i_pos = r.m_origin + (t * r.m_direction);
+    n = _f->normal_at_int(r, t);
+
     for (size_t l = 0; l < vl.size(); l++) {
-      n = _f->normal_at_int(r, t);
-      light_dir = vl[l]->m_position;
-      n_dot_l = max(dot(n, light_dir), 0.0);
-      color += (_f->color / 3.1416f) * vl[l]->m_diffuse * n_dot_l;
+      vis = true;
+      sr = Ray(vl[l]->m_position, i_pos);
+
+      for (size_t f = 0; f < vf.size(); f++) {
+	if (f != f_index && vf[f]->intersect(sr, _t)) {
+	  vis = false;
+	  break;
+	}
+      }
+
+      n_dot_l = max(dot(n, vl[l]->m_position), 0.0);
+      color += (vis ? 1.0f : 0.0f) * (_f->color / PI) * vl[l]->m_diffuse * n_dot_l;
     }
 
     return color;