X3DOM动画“KEY”

<X3D>
<Scene>   
<Transform DEF="thebox">       
<Shape><Box /></Shape>    
</Transform>
<TimeSensor DEF="Clock" loop="true" cycleInterval="5.0"/>
<PositionInterpolator DEF="TreePath" key=" 0.0 0.3 0.9" keyValue=" -4.0 0.0 0.0 4.0 0.0 0.0 4 4 0"/>
<ROUTE fromField="fraction_changed" fromNode="Clock"      toField="set_fraction" toNode="TreePath"/>   
<ROUTE fromField="value_changed" fromNode="TreePath"      toField="translation" toNode="thebox"/>
</Scene>
</X3D>

“KEY”的指必须是0~1之间，大于1的将会被忽略。。