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.

© Copyright 2022. BackToCAD Technologies LLC. All rights reserved. Kazmierczak® is a registered trademark of Kazmierczak Software GmbH. Print2CAD, CADdirect,, CAD Direct,, CAD Bot, are Trademarks of BackToCAD Technologies LLC. DWG is the name of Autodesk’s proprietary file format and technology used in AutoCAD® software and related products. Autodesk, the Autodesk logo, AutoCAD, DWG are registered trademarks or trademarks of Autodesk, Inc. All other brand names, product names, or trademarks belong to their respective holders. This website is independent of Autodesk, Inc., and is not authorized by, endorsed by, sponsored by, affiliated with, or otherwise approved by Autodesk, Inc. The material and software have been placed on this Internet site under the authority of the copyright owner for the sole purpose of viewing of the materials by users of this site. Users, press or journalists are not authorized to reproduce any of the materials in any form or by any means, electronic or mechanical, including data storage and retrieval systems, recording, printing or photocopying.