# File easy_vtk.rb, line 857
  def text( str, x, y, z, size )
    text = Vtk::VectorText.new
    text.SetText( str )
    mapper = Vtk::PolyDataMapper.new
    mapper.SetInput( text.GetOutput )
    actor = Vtk::Follower.new
    actor.SetMapper( mapper )
    actor.SetScale( size, size, size )
    actor.AddPosition( x, y, x )
    @ren.AddActor( actor )
    @ren.ResetCameraClippingRange
    actor.SetCamera( @ren.GetActiveCamera )
    return nil
  end