Figure 24.4 Four keys on a virtual keyboard.
24fig04.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
Group {
    children [
    # Middle C (C4)
        Transform {
            children [
                DEF WhiteKey Shape {
                    appearance Appearance {
                        material Material { }
                    }
                    geometry Box { size 0.23 0.1 1.5 }
                },
                DEF C4 TouchSensor { },
                Sound {
                    source DEF PitchC4 AudioClip {
                        url "tone1.wav"
                        pitch 1.0
                    }
                }
            ]
        },
    # C# above middle C (Cs4)
        Transform { translation 0.125 0.1 -0.375
            children [
                DEF BlackKey Shape {
                    appearance Appearance {
                        material Material {
                            diffuseColor 0.4 0.4 0.4
                        }
                    }
                    geometry Box { size 0.2 0.1 0.75 }
                },
                DEF Cs4 TouchSensor { }
                Sound {
                    source DEF PitchCs4 AudioClip {
                        url "tone1.wav"
                        pitch 1.059
                    }
                }
            ]
        },
    # D above middle C (D4)
        Transform { translation 0.25 0.0 0.0
            children [
                USE WhiteKey,
                DEF D4 TouchSensor { }
                Sound {
                    source DEF PitchD4 AudioClip {
                        url "tone1.wav"
                        pitch 1.122
                    }
                }
            ]
        },
    # D# above middle C (Ds4)
        Transform { translation 0.375 0.1 -0.375
            children [
                USE BlackKey,
                DEF Ds4 TouchSensor { }
                Sound {
                    source DEF PitchDs4 AudioClip {
                        url "tone1.wav"
                        pitch 1.189
                    }
                }
            ]
        }
    ]
}
ROUTE C4.touchTime  TO PitchC4.set_startTime
ROUTE Cs4.touchTime TO PitchCs4.set_startTime
ROUTE D4.touchTime  TO PitchD4.set_startTime
ROUTE Ds4.touchTime TO PitchDs4.set_startTime