AutoCAD Tutorial

AutoCAD 3D Modeling: Slice and Interfere

August 22, 2003

There are two useful commands that can help you in creating complex solid models. SLICE cuts the solid with a spatial plane. The INTERFERE command is capable to calculate the common volume of two solids and create a solid model based on the calculated volume.


  • This tutorial is designed for AutoCAD 2004 though might be applicable to other releases.
  • In this tutorial user entries are in boldface.
  • The 8 symbol represents pressing Enter.

1. Download r16_slice.dwg.

Note: If you are using AutoCAD 2002 or an earlier release download r15_slice.dwg.

2. Open the drawing in AutoCAD. The drawing consists of a composite solid and a cylinder [Figure 1].

Figure 1

3. Invoke INTERFERE (Draw menu > Solids > Interference).

4. When you are prompted for the first set of solids, select both solid models. Press Enter.

5. When you are prompted for the second set of solids press Enter.

6. Keep the new solid object:

Create interference solids? [Yes/No] <N>: y 8

7. Alter the shade mode to Gouraud shaded.

8. Freeze solid1 and solid2 layers to view the new solid object [Figure 2].

Figure 2

9. Thaw the frozen layers.

10. Invoke UNION (Draw menu > Solids > Union).

11. Select the first two solids (outer solids) and then press Enter

12. Invoke SLICE (Draw menu > Solids > Slice).

13. Cut the last solid with ZX plane:

Command: slice 8
Select objects: 1 found
Select objects: 8
Specify first point on slicing plane by [Object/Zaxis/View/XY/YZ/ZX/3points]
<3points>: zx 8
Specify a point on the ZX-plane <0,0,0>: 8

14. Keep the portion of model that is located on the positive side of the Y axis [Figure 3]:

Specify a point on desired side of the plane or [keep Both sides]: 0,1,0 8

Figure 3

15. Subtract the small solid from the big one [Figure 4].

Figure 4

Note: For more information on Subtract and other Boolean operations read the following tutorial: AutoCAD 3D Modeling: Boolean Operations

About the Author

Alireza Parsai is the founder of He is a mechanical engineer with more than 12 years experience with AutoCAD. Alireza is an Autodesk Authorized Author, the AutoCAD consultant for Al Khawarizmi Institute, a contributing editor for Augiworld magazine, a writer for CAD Digest, an instructor for AUGI Training Program, and an elected speaker for Autodesk University 2002. He has written 7 books in Farsi, 3 booklets in English, and more than 100 articles for different magazines and newsletters. You can reach him at or visit his website

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