Example for unfolding a surface     see ANT-ARES
	In the following case an elliptical tube is set not-centrally and oblique on a conic tubular segment, so that an additional cylindric tube can be welded on. The location of the welding seam is choosed in such a way, that it will help to align the tubular segments during assemblies.
	Usage: just move mouse over small pictures for illustration (pair of dividers - technical sketch, rolling pins - unfoldings)