Figure 17.13 A face with color varying from yellow to red.
17fig13.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 { }
        texture PixelTexture {
            image 1 2 3       # width, height, 3-byte RGB image
                0xFFFF00  # yellow at the bottom
                0xFF0000  # red at the top
        }
    }
    geometry IndexedFaceSet {
        coord Coordinate {
            point [
                -1.5 -1.0 0.0,   1.5 -1.0 0.0,
                 1.5  1.0 0.0,  -1.5  1.0 0.0,
            ]
        }
        coordIndex [ 0, 1, 2, 3 ]
        solid FALSE
    }
}