Representation of Geometric Information (Cont.) Representation of points and line segment in 3-D similar to 2-D,except that points have an extra z component Represent arbitrary polyhedra by dividing them into tetrahedrons,like triangulating polygons. Alternative:List their faces,each of which is a polygon,along with an indication of which side of the face is inside the polyhedron. 11 Database System Concepts,5th Ed. 24.11 @Silberschatz,Korth and SudarshanDatabase System Concepts, 5 24.11 ©Silberschatz, Korth and Sudarshan th Ed. 11 Representation of Geometric Information (Cont.) Representation of points and line segment in 3-D similar to 2-D, except that points have an extra z component Represent arbitrary polyhedra by dividing them into tetrahedrons, like triangulating polygons. Alternative: List their faces, each of which is a polygon, along with an indication of which side of the face is inside the polyhedron