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& shadow_ray, Vec3f& intensity)
  23 {
  24   // distance to light source
  25   Vec3f dir = m_pos-shadow_ray.origin();
  26   float r = dir.norm()-Epsilon;
  27   float falloff = 1.0f/(r*r);
  28
  29
  30   intensity = m_intensity * falloff;
  31
  32   // modify ray for shadow computation
  33   shadow_ray.setHit(0);
  34   // for shadow calculation
  35   shadow_ray.setT(r);
  36   // set direction to light source
  37   dir.normalize();
  38   shadow_ray.setDir(dir);
  39
  40   return true;
  41 }
  42
  43 const Vec3f&
  44 PointLight::position() const
  45 {
  46   return m_pos;
  47 }
  48
  49 const Vec3f&
  50 PointLight::intensity() const
  51 {
  52   return m_intensity;
  53 }
  54
  55 bool
  56 PointLight::IsArea()
  57 {
  58   return false;
  59 }