From d8f61abae79a3154d5e6dda98713295d1b850e95 Mon Sep 17 00:00:00 2001
From: Dan Goodliffe <dan@randomdan.homeip.net>
Date: Sun, 9 Apr 2023 12:42:09 +0100
Subject: Add helper to create a Ray from two points

---
 lib/ray.cpp | 6 ++++++
 lib/ray.hpp | 2 ++
 2 files changed, 8 insertions(+)

diff --git a/lib/ray.cpp b/lib/ray.cpp
index acbb807..f9e3311 100644
--- a/lib/ray.cpp
+++ b/lib/ray.cpp
@@ -1,6 +1,12 @@
 #include "ray.hpp"
 #include <algorithm>
 
+Ray
+Ray::fromPoints(glm::vec3 start, glm::vec3 p)
+{
+	return {start, glm::normalize(p - start)};
+}
+
 float
 Ray::distanceToLine(const glm::vec3 & p1, const glm::vec3 & e1) const
 {
diff --git a/lib/ray.hpp b/lib/ray.hpp
index 8bef1c8..9bf47af 100644
--- a/lib/ray.hpp
+++ b/lib/ray.hpp
@@ -7,6 +7,8 @@ class Ray {
 public:
 	Ray(glm::vec3 start, glm::vec3 direction) : start {start}, direction {direction} { }
 
+	static Ray fromPoints(glm::vec3, glm::vec3);
+
 	glm::vec3 start;
 	glm::vec3 direction;
 
-- 
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