# File Geodesic_SketchUp.rb, line 176
        def smooth_all( new_smooth = true )
                model = Sketchup.active_model
                model.start_operation "#{new_smooth ? 'Smooth' : 'Unsmooth'} All"
                self.entities.each{ |e|
                        next unless e.is_a?( Sketchup::Edge )
                        e.smooth = new_smooth;
                }
            model.commit_operation
        end