Added boarder finder.
Added boarder finder.

ahmadia/AbstractRendering,JosephCottam/AbstractRendering,JosephCottam/AbstractRendering,JosephCottam/AbstractRendering,JosephCottam/AbstractRendering,ahmadia/AbstractRendering,ahmadia/AbstractRendering,ahmadia/AbstractRendering,ahmadia/AbstractRendering,JosephCottam/AbstractRendering