When you use Pick Points to define your boundaries, AutoCAD analyzes all objects in the boundary set to derive the boundary definition. The boundary set is the set of objects that AutoCAD treats as eligible for analysis when defining boundaries from a specified point.
By default, the boundary set consists of all objects fully or partially visible in the current viewport. So, if 100 objects are currently visible, AutoCAD analyzes all 100 objects when you specify a point, regardless of the location of that point. Analysis of all of these objects can be time-consuming in a complex drawing. To hatch a small area of a complex drawing, you can define a custom boundary set. When you specify a point within the boundary set, AutoCAD does not analyze objects not included in the boundary set. Boundary sets are also useful for applying different hatch styles in different sections of a drawing.

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You can define a hatch boundary by specifying points directly. For example, you may want to illustrate a pattern fill in a small section of a drawing, as shown in the following illustration. Continue reading →

When you use Pick Points to define your boundaries, you can remove any detected islands from your boundary definition. In the following procedure, you remove islands so that the part is hatched as illustrated. Continue reading →