DEF NurbsInt NurbsPositionInterpolator {
  knot[0, 0, 0, .2, .4, .6, .8, 1, 1]
  keyValue[0 0 0, 1 1 0, 0 2 0, 2 3 0, -1 4 0, 5 5 0]
  }
  
  DEF sphere Transform {
  children [
  Shape {
        appearance Appearance {
          material Material {
            diffuseColor 0 1 0
                    emissiveColor 1 0 0
          }
        }
        geometry Transform {

  children [

  Shape {

        appearance Appearance {

          material Material {

            diffuseColor 0 1 0

     §2.html>Sphere {radius .1}
  }
  ]
  }