From 5ff96967a06cdea54600d7ebac1c9cd038540884 Mon Sep 17 00:00:00 2001
From: Sam Hocevar <sam@hocevar.net>
Date: Mon, 30 Apr 2012 13:40:51 +0000
Subject: [PATCH] math: add Quat::transform() to directly apply a quaternion to
 a vector.

---
 src/lol/math/vector.h | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/src/lol/math/vector.h b/src/lol/math/vector.h
index 8a7c4f6c..a68bb804 100644
--- a/src/lol/math/vector.h
+++ b/src/lol/math/vector.h
@@ -947,6 +947,13 @@ template <typename T> struct Quat
         return Quat<T>(w, -x, -y, -z);
     }
 
+    inline Vec3<T> transform(Vec3<T> const &v)
+    {
+        Quat<T> p = Quat<T>(0, v.x, v.y, v.z);
+        Quat<T> q = *this * p / *this;
+        return Vec3<T>(q.x, q.y, q.z);
+    }
+
 #if !defined __ANDROID__
     template<typename U>
     friend std::ostream &operator<<(std::ostream &stream, Quat<U> const &v);