Island detection methods specify whether to include objects within the outermost boundary as boundary objects when you are using Pick Points. These internal objects are known as islands. By default, AutoCAD uses the Flood island detection method. The Flood method includes islands as boundary objects, as shown in the following illustration. How AutoCAD hatches the detected islands depends on the island detection style. The following illustration uses the Normal island detection style, meaning that islands remain unhatched and islands within islands are hatched. Continue reading →