added Box intersect() optimization... ~2% faster

git-svn-id: svn://anubis/fart/trunk@305 7f9b0f55-74a9-4bce-be96-3c2cd072584d

util/Vector.cc

@@ -6,6 +6,10 @@
 
 #include "Vector.h"
 
+const Vector Vector::X(1, 0, 0);
+const Vector Vector::Y(0, 1, 0);
+const Vector Vector::Z(0, 0, 1);
+
 Vector::Vector()
 {
     m_array[0] = 0.0;

util/Vector.h

@@ -32,6 +32,10 @@ class Vector
         Vector & operator+=(const Vector & v2);
         Vector & operator-=(const Vector & v2);
 
+        static const Vector X;
+        static const Vector Y;
+        static const Vector Z;
+
     protected:
         double  m_array[3];
 };