Ported the obj parser.

include/util/vector_hash.hpp

@@ -0,0 +1,24 @@
+#pragma once
+
+#include "glm/glm.hpp"
+#include <memory>
+
+// Hash function for Eigen matrix and vector.
+// The code is from `hash_combine` function of the Boost library. See
+// http://www.boost.org/doc/libs/1_55_0/doc/html/hash/reference.html#boost.hash_combine .
+
+template<glm::length_t L, typename T, glm::qualifier Q>
+struct std::hash<glm::vec<L, T, Q>>
+{
+	auto operator() (const glm::vec<L, T, Q>& key) const
+	{
+		auto seed = std::size_t{};
+
+		for (glm::length_t i{}; i != L; ++i)
+		{
+			seed ^= std::hash<T>{}(key[i]) + 0x9e3779b9 + (seed << 6) + (seed >> 2);
+		}
+
+		return seed;
+	}
+};