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   float dist = ((ray.origin() + ray.direction() * ray.t()) - m_pos).norm();
  25
  26   float c1 = 1, c2 = 0.5, c3 = 0;
  27   float f_att = 1 / (c1 + c2*dist + c3*dist*dist);
  28
  29   intensity = m_intensity * f_att;
  30
  31   // store direction from light to hitpoint
  32   ray.setDir(ray.origin() + ray.direction() * (ray.t()-Epsilon) - m_pos);
  33   return true;
  34 }
  35
  36 const Vec3f&
  37 PointLight::position() const
  38 {
  39   return m_pos;
  40 }
  41
  42 const Vec3f&
  43 PointLight::intensity() const
  44 {
  45   return m_intensity;
  46 }
  47
  48