new file mode 100644
--- /dev/null
+++ b/pytouhou/utils/vector.py
@@ -0,0 +1,43 @@
+# -*- encoding: utf-8 -*-
+##
+## Copyright (C) 2012 Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
+##
+## This program is free software; you can redistribute it and/or modify
+## it under the terms of the GNU General Public License as published
+## by the Free Software Foundation; version 3 only.
+##
+## This program is distributed in the hope that it will be useful,
+## but WITHOUT ANY WARRANTY; without even the implied warranty of
+## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+## GNU General Public License for more details.
+##
+
+from math import sqrt
+
+
+class Vector(list):
+    def __init__(self, data=None):
+        list.__init__(self, data or [0] * 3)
+
+
+    def __add__(self, other):
+        return Vector([a+b for a, b in zip(self, other)])
+
+
+    def __sub__(self, other):
+        return Vector([a-b for a, b in zip(self, other)])
+
+
+def cross(vec1, vec2):
+    return Vector([vec1[1] * vec2[2] - vec2[1] * vec1[2],
+                   vec1[2] * vec2[0] - vec2[2] * vec1[0],
+                   vec1[0] * vec2[1] - vec2[0] * vec1[1]])
+
+
+def dot(vec1, vec2):
+    return vec1[0] * vec2[0] + vec2[1] * vec1[1] + vec1[2] * vec2[2]
+
+
+def normalize(vec1):
+    normal = 1 / sqrt(vec1[0] * vec1[0] + vec1[1] * vec1[1] + vec1[2] * vec1[2])
+    return Vector(x * normal for x in vec1)