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diff --git a/src/moof/frustum.hh b/src/moof/frustum.hh
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+
+/*]  Copyright (c) 2009-2010, Charles McGarvey  [**************************
+**]  All rights reserved.
+*
+* vi:ts=4 sw=4 tw=75
+*
+* Distributable under the terms and conditions of the 2-clause BSD license;
+* see the file COPYING for a complete text of the license.
+*
+**************************************************************************/
+
+#ifndef _MOOF_FRUSTUM_HH_
+#define _MOOF_FRUSTUM_HH_
+
+/**
+ * \file frustum.hh
+ * All things related to frustums!
+ */
+	
+#include <moof/math.hh>
+#include <moof/plane.hh>
+
+
+namespace moof {
+
+
+template <int D> class aabb;
+template <int D> class sphere;
+
+
+/**
+ * A six-sided volume for representing the space visible by a position
+ * looking outward.
+ */
+class frustum
+{
+public:
+
+	enum collision
+	{
+		outside			= 0,
+		inside			= 1,
+		intersecting	= 2
+	};
+
+	frustum() {}
+	frustum(const matrix4& modelview, const matrix4& projection)
+	{
+		init(modelview, projection);
+	}
+	frustum(const matrix4& modelview, scalar fovy, scalar aspect,
+			scalar abutting, scalar distant)
+	{
+		init(modelview, fovy, aspect, abutting, distant);
+	}
+
+	void init(const matrix4& modelview, const matrix4& projection);
+	void init(const matrix4& modelview, scalar fovy, scalar aspect,
+			  scalar abutting, scalar distant);
+
+	collision contains(const aabb<3>& aabb) const;
+	collision contains(const sphere<3>& sphere) const;
+
+
+private:
+
+	plane planes_[6]; // left, right, bottom, top, near, far
+};
+
+
+} // namespace moof
+
+#endif // _MOOF_FRUSTUM_HH_
+