src/physics/ray.hpp

   1 #ifndef TACOS_PHYSICS_RAY_HPP_
   2 #define TACOS_PHYSICS_RAY_HPP_
   3
   4 #include <limits>
   5 #include <glm/glm.hpp>
   6
   7
   8 namespace tacos {
   9
  10 struct Ray {
  11
  12         glm::vec3 origin;
  13         glm::vec3 direction;
  14
  15         glm::vec3 InverseDirection() const noexcept {
  16                 return glm::vec3(
  17                         std::fabs(direction.x) < std::numeric_limits<float>::epsilon()
  18                                 ? std::numeric_limits<float>::infinity()
  19                                 : 1.0f / direction.x,
  20                         std::fabs(direction.y) < std::numeric_limits<float>::epsilon()
  21                                 ? std::numeric_limits<float>::infinity()
  22                                 : 1.0f / direction.y,
  23                         std::fabs(direction.z) < std::numeric_limits<float>::epsilon()
  24                                 ? std::numeric_limits<float>::infinity()
  25                                 : 1.0f / direction.z);
  26         }
  27
  28 };
  29
  30 /// check whether given ray intersects with the triangle with vertices p0, p1, and p2
  31 /// point of intersection is writte to point if the result is positive
  32 bool TriangleIntersection(
  33         const Ray &ray,
  34         const glm::vec3 &p0,
  35         const glm::vec3 &p1,
  36         const glm::vec3 &p2,
  37         glm::vec3 &point) noexcept;
  38
  39 }
  40
  41 #endif