Recognizing a Boolean Feature: a Negative Volume

You can recognize Boolean features. You will recognize this type of features when the initial geometry is composed of complex shapes. Also, you can use this capability when the recognition of standard features fails.

Boolean features can be recognized as Remove (negative volumes) or Add (positive volumes) entities.

See Also
Recognizing a Boolean Feature: a Positive Volume
  1. Because the cavity of this 3D shape is not easily identifiable, you need to use the Boolean option. From the Recognize section of the action bar, click Manual Feature Recognition .

    The Feature Recognition dialog box that appears displays a list of features you can recognize.

    Important: Using this product release, the features you can recognize are the following ones:
    • Pad
    • Pocket
    • Hole
    • Fillet
    • Chamfer
    • Shaft
    • Groove
    • Boolean
    • Draft
  2. Select Boolean and select the bottom inner face. The face turns purple, indicating that it will be removed. By default, the app includes tangent and adjacent faces in the selection. This is why four additional faces also appear in purple.


    Because the Show Label option is on, a textual indication designating the selected face appears attached to the selected geometry.

  3. Select the Chain up to faces box and select the upper face. The upper face turns blue indicating that this is the face to be kept. 17 faces are included in the selection as indicated in the Selected Objects box.


    Important: Three creation options are available:
    • Parametric only: only recognized features are created (default option)
    • RemoveFace only: recognized geometry is removed.
    • Both: Parametric only and RemoveFace options are on

    Keep Parametric only on.

  4. Click OK to confirm. Remove.1 has been created and added to the specification tree.

    If you use the RemoveFace option, a RemoveFace.1 node is added to the tree.

    If you use the Both option, RemoveFace.1 and Remove.1 nodes are added to the tree.