Subject: Using islands and island detection


Islands are closed loops that reside inside other closed loops. CADdirect provides island-detection options so that you can specify which islands, if any, should be con­sidered in the area selection for a boundary.

The following figure shows a rectangular polyline with two islands. The circle is referred to as the outer island, and the octagon is referred to as a nested island.

 

Rectangular polyline (A) with outer island (B), with point (C) specifying the area selection, and nested island (D).

You can choose from three island-detection methods.

•   Nested Islands The outer entity and all its islands are considered for the polyline.

•   Outer Only Only the outer entity and its outer island are considered for the polyline.

•   Ignore Islands Only the outer entity is considered for the polyline.
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