How to Unite 3D Objects in AutoCAD

Here is one of the three most used commands while assembling in AutoCAD. The most part of creating a 3D object in AutoCAD is based on interlocking 2d parts seen in 3D.

AutoCAD gives you the ability to create trivial 3D objects with more or less a click, and you will be constructing the less trivial objects by combining the trivial objects using one of these commands: UNION, SUBTRACT and INTERSECT.

The UNION command

This command helps to unite 2 or more objects (2D or 3D) and make them one object.

If we consider the circle and the rectangle below

unite-object-autocad

If we consider that these objects overlap, the red image will be the result of their combination.

unite-object-autocad

The resulting object (in red) now is a single object.

This command works only with solids, regions and surfaces. The following is an object that is built using the combination of a pyramid and a box.

unite-object-autocad

To make the series complete, we are coming soon with the INTERSECT and SUBTRACT command.

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