ReflectiveEyeLightShader.cxx

   1 #include "ReflectiveEyeLightShader.hxx"
   2 #include "Primitive.hxx"
   3 #include "Scene.hxx"
   4
   5 ReflectiveEyeLightShader::ReflectiveEyeLightShader(Scene* scene,
   6                                                    float reflectivity,
   7                                                    const Vec3f& color)
   8   : EyeLightShader(scene,color),
   9     m_reflectivity(reflectivity)
  10 {
  11 }
  12
  13 ReflectiveEyeLightShader::~ReflectiveEyeLightShader()
  14 {
  15 }
  16
  17 ReflectiveEyeLightShader::ReflectiveEyeLightShader()
  18   : EyeLightShader(0),
  19     m_reflectivity(0)
  20 {
  21 }
  22
  23 Vec3f
  24 ReflectiveEyeLightShader::Shade(Ray& ray)
  25 {
  26   Vec3f eyeColor = EyeLightShader::Shade(ray);
  27   Vec3f reflColor;
  28
  29   // get normal and turn towards ray if angle > 90°
  30   Vec3f n = ray.hit()->GetNormal(ray);
  31   float cos_theta = n.dot(ray.direction());
  32   // we just need the sign, no value
  33   if( cos_theta > 0 ) {
  34     std::cout << "cos_theta="<<cos_theta <<", flipping normal" <<std::endl;
  35     n = n * -1;
  36   }
  37
  38   // shoot secondary rays from intersection
  39   Ray sec(ray.origin() + ray.direction() * (ray.t() - Epsilon),
  40     ray.direction() + n * 2);
  41   sec.setRecursionDepth(ray.recursionDepth() - 1);
  42
  43   if(sec.recursionDepth() + 1 > 0) {
  44     reflColor = m_scene->RayTrace(sec);
  45     //reflColor = Shade(sec);
  46   }
  47   return eyeColor + (reflColor * m_reflectivity);
  48 }