The following pictures illustrate again the process:
1: Follow contour,
to correct gaps and jutting out lines automatically.
2:Thin out contour,
i.e. a polygon out of many single parts is transformed into few arcs or lines within certain input limits.
3 and 4: Pocket milling,
parallel to contour (3) or parallel to angle (4). The latter can automatically do a finishing run parallel to the contour (see picture in detail).