From b938ef85e0083ad63c0a2effa71503e005f47bd0 Mon Sep 17 00:00:00 2001
From: Lars Mueller <appgurulars@gmx.de>
Date: Fri, 9 Sep 2022 14:34:42 +0200
Subject: [PATCH] Add vector.reflect

---
 vector.lua | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/vector.lua b/vector.lua
index 3e94145..e37368e 100644
--- a/vector.lua
+++ b/vector.lua
@@ -187,6 +187,10 @@ function dot(v, w)
 	return sum
 end
 
+function reflect(v, normal --[[**normalized** plane normal vector]])
+	return subtract(v, multiply_scalar(normal, 2 * dot(v, normal))) -- reflection of v at the plane
+end
+
 --+ Angle between two vectors
 --> Signed angle in radians
 function angle(v, w)