PointLight.cxx

   1 #include "PointLight.hxx"
   2
   3 PointLight::PointLight(Scene* scene, const Vec3f& pos, const Vec3f& intensity)
   4   : Light(scene),
   5     m_pos(pos),
   6     m_intensity(intensity)
   7 {
   8 }
   9
  10 PointLight::~PointLight()
  11 {
  12 }
  13
  14 PointLight::PointLight()
  15   : Light(0),
  16     m_pos(Vec3f()),
  17     m_intensity(Vec3f())
  18 {
  19 }
  20
  21 bool
  22 PointLight::Illuminate(Ray& ray, Vec3f& intensity)
  23 {
  24   Vec3f dir = (ray.origin() + ray.direction() * (ray.t()-Epsilon)) - m_pos;
  25   float dist = dir.norm();
  26   dir.normalize();
  27
  28   float c1 = 1, c2 = 0.5, c3 = 0;
  29   //float f_att = 1 / (dist*dist);
  30   float f_att = 1 / (c1 + c2*dist + c3*dist*dist);
  31
  32   intensity = m_intensity * f_att;
  33
  34   // store direction from light to hitpoint
  35   ray.setDir(dir);
  36   return true;
  37 }
  38
  39 const Vec3f&
  40 PointLight::position() const
  41 {
  42   return m_pos;
  43 }
  44
  45 const Vec3f&
  46 PointLight::intensity() const
  47 {
  48   return m_intensity;
  49 }
  50
  51