From 5fffa2f9d8c99cd54f4211fa89ffdc63583f5577 Mon Sep 17 00:00:00 2001
From: Colby Klein <shakesoda@gmail.com>
Date: Tue, 13 Dec 2016 15:10:09 -0800
Subject: [PATCH] don't give NaN's when normalizing 0

---
 modules/vec3.lua | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/modules/vec3.lua b/modules/vec3.lua
index 05ff9ae..b88435e 100644
--- a/modules/vec3.lua
+++ b/modules/vec3.lua
@@ -133,6 +133,9 @@ end
 -- @treturn vec3 out
 function vec3.normalize(out, a)
 	local l = vec3.len(a)
+	if l == 0 then
+		return out
+	end
 	out.x = a.x / l
 	out.y = a.y / l
 	out.z = a.z / l