Figure 31.2 An external file containing a material library with the WallColor-node-type definition.
31fig02.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
PROTO WallColor [ ] {
    Material {
        diffuseColor 0.0 0.6 1.0
    }
}
PROTO Gold [ ] {
    Material { 
        ambientIntensity 0.4
        diffuseColor 0.22 0.15 0.0
        specularColor 0.71 0.70 0.56
        shininess 0.16
    }
}
PROTO Aluminum [ ] {
    Material { 
        ambientIntensity 0.3
        diffuseColor 0.30 0.30 0.50
        specularColor 0.70 0.70 0.80
        shininess 0.10
    }
}
PROTO Copper [ ] {
    Material { 
        ambientIntensity 0.26
        diffuseColor 0.30 0.11 0.00
        specularColor 0.75 0.33 0.00
        shininess 0.08
    }
}