Subtraction of objects in AutoCAD

Here comes the SUBTRACT command, one the most used command in 3D while working in AutoCAD.

By now, you must be able to use the UNION command which we worked with lately. This command in a complementary command to the UNION command and is almost unavoidable while working in 3D in AutoCAD.

3D Subtraction in AutoCAD

Let’s consider the two objects

unite-object-autocad

Using the SUBTRACT command, we will need the two objects to overlap.

To use the SUBTRACT command in AutoCAD

  1. Type SUBTRACT and press ENTER
  2. Select solids, surfaces and regions to subtract from and press ENTER
  3. Select solids, surfaces and regions to subtract and press ENTER

If we select the circle at step 2 and the rectangle at step 3, the red object is the result of this command.

The resulting object comes from the subtraction of the rectangle from the circle.

unite-object-autocad

Contrary to the previous selection order, if we decide to select the rectangle at step 2 and the circle at step 3. Here is what we end up with.

unite-object-autocad

Caution: this command works only with regions, surfaces and solids.

Here is what this will help you achieve in 3D

subtract-autocad

After rendering:

On the left: image before subtraction
On the right: Image after subtraction

subtract-autocad

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