EXTERNPROTO Segment [
          field         SFVec3f     bboxCenter
          field         SFVec3f     bboxSize
          exposedField  SFVec3f     centerOfMass
          exposedField  MFNode      children
          exposedField  SFNode      coord
          exposedField  MFNode      displacers
          exposedField  SFFloat     mass
          exposedField  MFFloat     momentsOfInertia
          exposedField  SFString    name
          eventIn       MFNode      addChildren
          eventIn       MFNode      removeChildren
  ]
  {
          Group {
                  addChildren    IS addChildren
                  bboxCenter     IS bboxCenter
                  bboxSize       IS bboxSize
                  children       IS children
                  removeChildren IS removeChildren
          }
  }