InfinitePlane.cxx

   1 #include "InfinitePlane.hxx"
   2
   3 InfinitePlane::InfinitePlane(const Vec3f& a, const Vec3f& n, Shader* shader)
   4   : Primitive(shader),
   5     m_a(a),
   6     m_n(n)
   7 {
   8
   9 }
  10
  11 InfinitePlane::~InfinitePlane()
  12 {
  13 }
  14
  15 bool
  16 InfinitePlane::Intersect(Ray& ray)
  17 {
  18   Vec3f diff = m_a - ray.origin();
  19   float t = diff.dot(m_n) / ray.direction().dot(m_n);
  20   if (t < 1e-5 || t > ray.t())
  21     return false;
  22   ray.setT(t);
  23   return true;
  24 }
  25
  26 Vec3f
  27 InfinitePlane::GetNormal(Ray& ray)
  28 {
  29   // We already have the surface normal
  30   return m_n;
  31 }