Boundary Command in AutoCAD

The Boundary command in AutoCAD is used to create a closed polyline or region by defining the boundaries of an enclosed area. This command is useful when you need to fill or hatch a specific area, or when you want to create a closed boundary that follows the edges of existing objects, such as lines, curves, and other shapes. The Boundary command is commonly used in architectural, civil engineering, and mechanical design workflows.

How to Use the Boundary Command

Follow these steps to create a boundary using the Boundary command:

Step 1: Activate the Boundary Command

To start the Boundary command, you can:

  • Type BOUNDARY in the command line and press Enter.
  • Click the Boundary icon from the Draw panel or ribbon (if available).

Step 2: Select the Boundary Set

After activating the Boundary command, AutoCAD will prompt you to select the objects that will form the boundary. You can:

  • Click inside the enclosed area to select the boundary edges automatically.
  • Manually select the boundary objects (lines, arcs, or polylines) that will define the closed area.

Step 3: Choose the Boundary Type

AutoCAD will then prompt you to choose the boundary type. You can select either:

  • Polyline: Creates a closed polyline that follows the selected boundary edges.
  • Region: Creates a region object, which is a more advanced closed area object that can be used for further operations like 3D modeling or boolean operations.

Step 4: Adjust Boundary Settings

You can adjust additional settings for the boundary, such as:

  • Island Detection: If there are smaller enclosed areas (islands) within the boundary, you can choose to include or exclude them from the boundary.
  • Outer Boundary: You can specify whether to create a boundary based on the outermost closed shape.

Step 5: Complete the Boundary Command

Once you have selected the objects and adjusted the settings, AutoCAD will create the boundary object. To complete the command:

  • Press Enter or Esc to finish the command.

Applications of the Boundary Command

The Boundary command is useful in various applications, including:

  • Creating closed areas for hatching in architectural and engineering drawings.
  • Defining regions for further 3D modeling or extrusion in mechanical and civil design projects.
  • Automatically generating closed boundaries for complex shapes or irregular areas in floor plans and site designs.

Conclusion

The Boundary command in AutoCAD is a versatile tool that helps create precise and closed areas for a variety of applications. Whether you need a polyline for simple design tasks or a region for more complex modeling operations, the Boundary command streamlines the process and ensures accuracy in your drawings.




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