AutoCAD 2026 Reigon Command details with 3 examples

In AutoCAD 2026, closed 2D objects can be transformed into regions—2D spaces with physical attributes like area and perimeter—by using the REGION command. Advanced modelling activities including Boolean operations (UNION, SUBTRACT, INTERSECT) and analysis tasks can be performed in these locations.

---

🔧 Command: REGION

Alias: REG

---

🧰 Functionality:

• Converts closed 2D shapes (like circles, closed polylines, ellipses, and splines) into region objects.
• Regions can be analyzed (e.g., area, centroid) or used in 3D operations like extrude or Boolean combinations.

---

✅ Requirements:

• The 2D object must be completely closed.
• No gaps or overlaps between segments.
• It must lie on the same plane (coplanar).

---

📌 How to Use REGION Command:

1. Type REGION or REG in the command line.
2. Select the closed 2D objects (circle, polyline, etc.).
3. Press Enter – the objects are converted into region(s).

---

🔍 Examples:

---

🧪 Example 1: Converting a Circle to a Region

plaintextCopyEditCommand: REGION
Select objects: [Select a circle]
1 Region created.

Now you can check its area using AREA or apply a 3D operation like EXTRUDE.

---

🧪 Example 2: Creating a Region from a Closed Polyline

1. Draw a rectangle using the RECTANGLE command.
2. Type REGION, select the rectangle.

plaintextCopyEditCommand: REGION
Select objects: [Select rectangle]
1 Region created.

This rectangle can now be used in Boolean operations like UNION or SUBTRACT.

---

🧪 Example 3: Subtracting One Region from Another

1. Create two overlapping closed shapes (like a large rectangle and a small circle inside).
2. Convert both to regions using REGION.
3. Use the SUBTRACT command:

plaintextCopyEditCommand: SUBTRACT
Select solids and regions to subtract from: [Select large rectangle region]
Select solids and regions to subtract: [Select inner circle region]

This will cut out the circular region from the rectangle, creating a donut-like shape.

---

🧠 Tips:

Great for calculating areas of complex shapes before modeling in 3D.

Use LIST command to inspect region properties.

Use UNION, SUBTRACT, and INTERSECT with regions just like 3D solids.