Figure 8.7 Three interpolators used to rotate three bars.
08fig07.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 [
    # Three rotating bars
        DEF Bar1 Transform {
            children Shape {
                appearance DEF White Appearance {
                    material Material { }
                }
                geometry Box { size 1.5 0.2 0.2 }
            }
        },
        DEF Bar2 Transform {
            children Shape {
                appearance USE White
                geometry Box { size 0.2 1.5 0.2 }
            }
        },
        DEF Bar3 Transform {
            children Shape {
                appearance USE White
                geometry Box { size 0.2 0.2 1.5 }
            }
        },
    # Animation clock
        DEF Clock TimeSensor {
            cycleInterval 4.0
            loop TRUE
        },
    # Animation paths, one for each bar
        DEF BarPath1 OrientationInterpolator {
            key [ 0.0, 0.50, 1.0 ]
            keyValue [
                0.0 0.0 1.0  0.0,
                0.0 0.0 1.0  3.14,
                0.0 0.0 1.0  6.28
            ]
        },
        DEF BarPath2 OrientationInterpolator {
            key [ 0.0, 0.50, 1.0 ]
            keyValue [
                1.0 0.0 0.0  0.0,
                1.0 0.0 0.0  3.14,
                1.0 0.0 0.0  6.28
            ]
        },
        DEF BarPath3 OrientationInterpolator {
            key [ 0.0, 0.50, 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
            ]
        }
    ]
}
ROUTE Clock.fraction_changed TO BarPath1.set_fraction
ROUTE Clock.fraction_changed TO BarPath2.set_fraction
ROUTE Clock.fraction_changed TO BarPath3.set_fraction
ROUTE BarPath1.value_changed TO Bar1.set_rotation
ROUTE BarPath2.value_changed TO Bar2.set_rotation
ROUTE BarPath3.value_changed TO Bar3.set_rotation