partial replacement of math classes with glm

stdafx.h

@@ -85,5 +85,8 @@
 #include <glm/glm.hpp>
 #include <glm/gtc/matrix_transform.hpp>
 #include <glm/gtc/type_ptr.hpp>
+#include <glm/gtc/epsilon.hpp>
+#include <glm/gtx/rotate_vector.hpp>
+#include <glm/gtx/norm.hpp>
 
 #include "openglmatrixstack.h"