Figure 27.3 An orb that animates when the viewer collides with its box proxy shape.
27fig03.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 [
        NavigationInfo {
            headlight FALSE
            avatarSize [ 1.0, 1.0, 0.75 ]
        },
    # Floor (two strips)
        Transform {
            translation 0.0 0.0 2.5
            children DEF Floor Inline { url "dfloor.wrl" }
        },
        Transform { translation 0.0 0.0 -2.5 children USE Floor },
    # Collision group
        DEF OrbCollide Collision {
            proxy Transform {
                translation 0.0 0.6 0.0
                children Shape {
                    geometry Box { size 0.4 1.2 0.4 }
                }
            }
            children [
            # Glowing orb with sound effects
                DEF OrbSpin Transform {
                    translation 0.0 1.0 0.0
                    children [
                    # Orb light
                        PointLight {
                            location 0.3 0.0 0.0
                            radius 10.0
                            ambientIntensity 0.2
                            color 0.7 0.5 0.0
                        },
                    # Orb itself
                        Shape {
                            appearance Appearance {
                                # No material, use emissive texturing
                                texture ImageTexture { url "fire.jpg" }
                            }
                            geometry Sphere { radius 0.2 }
                        },
                    # Orb sounds
                        Sound {
                            source AudioClip {
                                url "drone1.wav"
                                loop TRUE
                            }
                            intensity 0.5
                        },
                        DEF WispyAmp Sound {
                            source DEF Wispy AudioClip {
                                url "willow1.wav"
                                stopTime 1.0
                            }
                            intensity 0.0
                        }
                    ]
                },
            # Pedestal pyramid
                Shape {
                    appearance DEF PedestalColor Appearance {
                        material Material { }
                    }
                    geometry IndexedFaceSet {
                        coord Coordinate {
                            point [
                            # Around the base
                                -0.12 0.03  0.12,   0.12 0.03  0.12,
                                 0.12 0.03 -0.12,  -0.12 0.03 -0.12,
                            # Tip
                                 0.0  0.63  0.0,
                            ]
                        }
                        coordIndex [
                            0, 1, 4, -1,  1, 2, 4, -1,
                            2, 3, 4, -1,  3, 0, 4, -1,
                        ]
                        solid TRUE
                    }
                },
            # Pedestal base
                Transform {
                    translation 0.0 0.015 0.0
                    children Shape {
                        appearance USE PedestalColor
                        geometry Box { size 0.4 0.03 0.4 }
                    }
                },
            ]
        }
    # Animation clock
        DEF Clock TimeSensor {
            cycleInterval 28.0
        },
    # Orb animation and volume control
        DEF OrbSpinner OrientationInterpolator {
            key [ 0.0, 0.5, 1.0 ]
            keyValue [
                0.0 1.0 0.0 0.0,
                0.0 1.0 0.0 3.14,
                0.0 1.0 0.0 6.28
            ]
        },
        DEF WispyVolume ScalarInterpolator {
            key      [ 0.0, 0.1, 0.9, 1.0 ]
            keyValue [ 0.0, 0.6, 0.6, 0.0 ]
        }
    ]
}
ROUTE OrbCollide.collideTime    TO Clock.set_startTime
ROUTE OrbCollide.collideTime    TO Wispy.set_startTime
ROUTE Clock.fraction_changed    TO OrbSpinner.set_fraction
ROUTE Clock.fraction_changed    TO WispyVolume.set_fraction
ROUTE OrbSpinner.value_changed  TO OrbSpin.set_rotation
ROUTE WispyVolume.value_changed TO WispyAmp.set_intensity