Collision

  Collision { 
      eventIn      MFNode   addChildren
      eventIn      MFNode   removeChildren
      exposedField MFNode   children        []
      exposedField SFBool   collide         TRUE
      field        SFVec3f  bboxCenter      0 0 0      # (-,)
      field        SFVec3f  bboxSize        -1 -1 -1   # (0,) or -1,-1,-1
      field        SFNode   proxy           NULL
      eventOut     SFTime   collideTime
    }