Hatch fills the island ...why?

despite exploding and analysing, also project to cplane the inner shape and delete original etc, I am unable to fill with hatch this shape and have a white island.

If I draw a box and then another within I can get it to behave on that.

Unable hatch island out.3dm (28.5 KB)


_Hatch needs closed curves to work, your inner island curve is an open curve.


Good find by clement.

Use CrvStart and CrvEnd to mark the ends of the curve. In this case it appears to overlap.