Figure 13.11 Lines in a line set mark the 12 edges of a box.
13fig11.wrl	Click on the image to view the VRML scene.

#VRML V2.0 utf8
# The VRML 2.0 Sourcebook
# Copyright (c) 1997
# Andrea L. Ames, David R. Nadeau, and John L. Moreland
Shape {
    appearance Appearance {
        material Material {
            emissiveColor 1.0 1.0 1.0
        }
    }
    geometry IndexedLineSet {
        coord Coordinate {
            point [
            # Coordinates around the top of the cube
                -1.0  1.0  1.0,
                 1.0  1.0  1.0,
                 1.0  1.0 -1.0,
                -1.0  1.0 -1.0,
            # Coordinates around the bottom of the cube
                -1.0 -1.0  1.0,
                 1.0 -1.0  1.0,
                 1.0 -1.0 -1.0,
                -1.0 -1.0 -1.0
            ]
        }
        coordIndex [
        # top
            0, 1, 2, 3, 0, -1,
        # bottom
            4, 5, 6, 7, 4, -1,
        # vertical edges
            0, 4, -1,
            1, 5, -1,
            2, 6, -1,
            3, 7
        ]
    }
}