       SippObjectInstance objecthandle
              Create  a  new  instance  of  a  previously defined
              object referenced by  objecthandle.  The  lists  of
              surfaces  and  subobjects  in  the  object  are not
              copied, but a new reference with its own  transfor-
              mation  matrix is created. The matrix is set to the
              identity matrix. If the object is changed, i.e.  if
              one  of its subobjects or surfaces are transformed,
              one is deleted or added, the change  will  also  be
              seen in the copy.
