diff -r a4055f67b9c7 -r cb81ecb5fb23 src/geometry.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/geometry.h	Wed Feb 26 02:21:07 2020 +0200
@@ -0,0 +1,34 @@
+#pragma once
+#include "basics.h"
+
+namespace geom
+{
+	struct Plane
+	{
+		glm::vec3 normal;
+		glm::vec3 anchor;
+	};
+
+	struct Line
+	{
+		glm::vec3 direction;
+		glm::vec3 anchor;
+	};
+
+	template<int N>
+	struct Polygon
+	{
+		glm::vec3 points[N];
+	};
+
+	inline const glm::vec3 origin = {0, 0, 0};
+	inline const Plane XY = {{0, 0, 1}, origin};
+	inline const Plane XZ = {{0, 1, 0}, origin};
+	inline const Plane YZ = {{1, 0, 0}, origin};
+	using Triangle = Polygon<3>;
+
+	Line lineFromPoints(const glm::vec3& point_1, const glm::vec3 point_2);
+	Plane planeFromTriangle(const Triangle& triangle);
+	glm::vec3 normalVector(const Triangle& triangle);
+	std::optional<glm::vec3> linePlaneIntersection(const Line& line, const Plane& plane);
+}