From a8da96eda4e76703ec839b027a38683f970c4c31 Mon Sep 17 00:00:00 2001
From: Brendan Zabarauskas <bjzaba@yahoo.com.au>
Date: Fri, 28 Dec 2012 19:48:39 +1000
Subject: [PATCH] Reduce the number of times normalize is called

---
 src/mat3.rs | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/mat3.rs b/src/mat3.rs
index 612a262..b118492 100644
--- a/src/mat3.rs
+++ b/src/mat3.rs
@@ -227,8 +227,8 @@ pub impl<T:Copy Float> Mat3<T> {
     #[inline(always)]
     static pure fn look_at(dir: &Vec3<T>, up: &Vec3<T>) -> Mat3<T> {
         let dir_ = dir.normalize();
-        let up_  = up.normalize().cross(&dir_).normalize();
-        let side = dir_.cross(&up_).normalize();
+        let side = dir_.cross(&up.normalize());
+        let up_  = side.cross(&dir_).normalize();
         
         Mat3::from_axes(up_, side, dir_)
     }