X-Git-Url: https://git.localhorst.tv/?a=blobdiff_plain;ds=sidebyside;f=src%2Fphysics%2Fray.hpp;h=22d19c435244a6473ab8c89150e3be25b00d220c;hb=0146c7b7f02ef5d74116546489aee85383bb4969;hp=355af50992a1341ff390a8f654d551639876a05b;hpb=2e761a60d1717297b7e308ef1b66e2a81319fdff;p=tacos.git

diff --git a/src/physics/ray.hpp b/src/physics/ray.hpp
index 355af50..22d19c4 100644
--- a/src/physics/ray.hpp
+++ b/src/physics/ray.hpp
@@ -1,6 +1,7 @@
 #ifndef TACOS_PHYSICS_RAY_HPP_
 #define TACOS_PHYSICS_RAY_HPP_
 
+#include <limits>
 #include <glm/glm.hpp>
 
 
@@ -11,8 +12,30 @@ struct Ray {
 	glm::vec3 origin;
 	glm::vec3 direction;
 
+	glm::vec3 InverseDirection() const noexcept {
+		return glm::vec3(
+			std::fabs(direction.x) < std::numeric_limits<float>::epsilon()
+				? std::numeric_limits<float>::infinity()
+				: 1.0f / direction.x,
+			std::fabs(direction.y) < std::numeric_limits<float>::epsilon()
+				? std::numeric_limits<float>::infinity()
+				: 1.0f / direction.y,
+			std::fabs(direction.z) < std::numeric_limits<float>::epsilon()
+				? std::numeric_limits<float>::infinity()
+				: 1.0f / direction.z);
+	}
+
 };
 
+/// check whether given ray intersects with the triangle with vertices p0, p1, and p2
+/// point of intersection is writte to point if the result is positive
+bool TriangleIntersection(
+	const Ray &ray,
+	const glm::vec3 &p0,
+	const glm::vec3 &p1,
+	const glm::vec3 &p2,
+	glm::vec3 &point) noexcept;
+
 }
 
 #endif