Defining Hatch Boundaries: Using Boundary Sets

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.

In the following example, you create a boundary set within a map before defining and hatching your boundary.

To define a boundary set in a complex drawing

  1. From the Draw menu, choose Hatch.
  2. In the Boundary Hatch dialog box, choose the Advanced tab.
  3. In the Boundary Set section of the Advanced tab, choose Select New Boundary Set.
  4. At the Select Objects prompt, select the objects you want to include in the boundary set (1) and press ENTER.
  5. In the Boundary Hatch dialog box, choose Pick Points.
  6. Specify the internal point (2) to define the boundary, and press ENTER.
  7. Choose OK to apply the hatch.

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