PROTO element [
  exposedField SFFloat radius 1
  exposedField SFColor color 1 0 0
  exposedField SFFloat speed 0.1
  exposedField SFFloat accel 0.1
  exposedField SFVec3f translation 0 0 0
  exposedField SFVec3f scale 0.2 0.2 0.2
  exposedField SFRotation rotation 0 0 0 0
  ]{
  DEF GROUP Transform {
  translation IS translation
  scale IS scale
  rotation IS rotation
  children [
  Shape {
           geometry Sphere { radius 10 }
           appearance Appearance {
                  material DEF MATERIAL Material {
                          diffuseColor IS color
                          transparency 0.8
                          }
                  }
  }
  Switch {
  whichChoice -1
  choice [
  DEF OBJECT object { }
  ] }
  bounce { translation 0 0 0 scale 0.5 0.5 0.5  accel IS speed object USE OBJECT  }
  ]}
  }