For bosses, the curves of the boss are offset and then clipped against the shape of the stock. When using a square piece of stock the toolpaths tend to cut the four corners first, and then work their way inward. The extent of the toolpaths can be altered by using a stock curve of total stock.
For pockets, the boundary of the pocket is offset and the toolpaths are cut starting from the center of the pocket. The shape of the stock does not affect the toolpaths.
