Scene.cxx

   1 #include <sstream>
   2 #include <fstream>
   3
   4
   5 #include "Scene.hxx"
   6 #include "PerspectiveCamera.hxx"
   7 #include "EyeLightShader.hxx"
   8 #include "Triangle.hxx"
   9
  10 Scene::Scene()
  11   : m_camera(new PerspectiveCamera(Vec3f(0,0,8),
  12                                    Vec3f(0,0,-1),
  13                                    Vec3f(0,1,0),
  14                                    60,
  15                                    640,
  16                                    480)
  17              ),
  18     m_bgColor(Vec3f(0,0,0)),
  19     m_shader(0),
  20     m_scene_box(Box())
  21 {
  22 }
  23
  24 Scene::~Scene()
  25 {
  26   delete m_camera;
  27   if(m_shader != 0)
  28     delete m_shader;
  29
  30   for(unsigned int i = 0; i < m_primitives.size(); ++i)
  31     {
  32       delete m_primitives[i];
  33     }
  34   m_primitives.clear();
  35 }
  36
  37 Scene::Scene(const Scene& s)
  38 {
  39   operator=(s);
  40 }
  41
  42 Scene&
  43 Scene::operator=(const Scene& s)
  44 {
  45   return *this;
  46 }
  47
  48 void
  49 Scene::Add(Primitive* p)
  50 {
  51   m_primitives.push_back(p);
  52 }
  53
  54 void
  55 Scene::Add(Light* l)
  56 {
  57   m_lights.push_back(l);
  58 }
  59
  60 bool
  61 Scene::Intersect(Ray& ray)
  62 {
  63   bool intersect = false;
  64
  65   for(unsigned int i = 0; i < m_primitives.size(); ++i)
  66     {
  67       intersect |= m_primitives[i]->Intersect(ray);
  68     }
  69
  70   return intersect;
  71 }
  72
  73 bool
  74 Scene::Occluded(Ray& ray)
  75 {
  76   return this->Intersect(ray);
  77 }
  78
  79 Vec3f
  80 Scene::RayTrace(Ray& ray)
  81 {
  82   bool intersect = this->Intersect(ray);
  83   return (intersect) ? ray.hit()->shader()->Shade(ray) : m_bgColor;
  84 }
  85
  86 const Camera*
  87 Scene::camera() const
  88 {
  89   return m_camera;
  90 }
  91
  92 std::vector<Light*>
  93 Scene::lights() const
  94 {
  95   return m_lights;
  96 }
  97
  98 void
  99 Scene::setCamera(const Camera* camera)
 100 {
 101   if(m_camera != 0)
 102     delete m_camera;
 103   m_camera = const_cast<Camera*>(camera);
 104 }
 105
 106 void
 107 Scene::ParseOBJ(const std::string& file, float scale)
 108 {
 109   std::cerr << "(Scene): Parsing OBJ file : " << file << std::endl;
 110
 111   // clear old buffers
 112   m_vertices.clear();
 113   m_faces.clear();
 114
 115   // for the moment, we will attach a white eyelight shader to each object
 116   // in the future, you will extend your parser to also read in material definitiions
 117   if(m_shader == 0) // not yet defined
 118     m_shader = new EyeLightShader(this, Vec3f(1.0,1.0,1.0));
 119
 120
 121   // now open file
 122   std::fstream in;
 123   in.open(file.c_str(), std::ios::in);
 124   if(in.bad() || in.fail())
 125     {
 126       std::cerr << "(Scene): Could not open file " << file << std::endl;
 127       return;
 128     }
 129
 130   // read lines
 131   std::string line;
 132   while(!in.eof())
 133     {
 134       std::getline(in, line);
 135       this->parseOBJLine(line);
 136     }
 137
 138   // finished parsing file -> close fileStream
 139   in.close();
 140
 141   // build triangle list from parsed vertices
 142   this->buildTriangleList(scale);
 143
 144   std::cerr << "(Scene): Finished parsing." << std::endl;
 145 }
 146
 147
 148 void
 149 Scene::parseOBJLine(const std::string& line)
 150 {
 151   std::istringstream iss(line);
 152   std::string key;
 153   iss >> key;
 154   if (key == "v")
 155     {
 156       // parse vertex //
 157       this->parseVertex(iss);
 158     }
 159   else if (key == "f")
 160     {
 161       // parse face //
 162       this->parseFace(iss);
 163     }
 164 }
 165
 166 void
 167 Scene::parseVertex(std::istringstream& iss)
 168 {
 169   Vec3f v;
 170   iss >> v[0] >> v[1] >> v[2];
 171
 172   m_vertices.push_back(v);
 173   m_centroid += v;
 174 }
 175
 176 void
 177 Scene::parseFace(std::istringstream& iss)
 178 {
 179   Vec3f f;
 180   iss >> f[0] >> f[1] >> f[2];
 181   m_faces.push_back(f);
 182 }
 183
 184 void
 185 Scene::buildTriangleList(float fac)
 186 {
 187   for(unsigned int f = 0; f < m_faces.size(); ++f)
 188     {
 189       // stores indices of triangle into vertex list
 190       // remember: indices start at 1!!
 191       Vec3f face_idx = m_faces[f];
 192       this->Add(new Triangle(m_vertices[ face_idx[0]-1 ] * fac,
 193                              m_vertices[ face_idx[1]-1 ] * fac,
 194                              m_vertices[ face_idx[2]-1 ] * fac,
 195                              m_shader));
 196
 197     }
 198   m_centroid /= static_cast<float>(m_vertices.size());
 199   std::cerr << "(Scene): Model centroid = " << m_centroid * fac << std::endl;
 200 }
 201
 202 void
 203 Scene::CalcBounds()
 204 {
 205   for(unsigned int i = 0; i < m_primitives.size(); ++i)
 206   {
 207     m_scene_box.Extend(m_primitives[i]->CalcBounds());
 208   }
 209 }
 210
 211 const Box&
 212 Scene::GetSceneBox() const
 213 {
 214   return m_scene_box;
 215 }