AutoCAD 3D Box Command Tutorial Complete | Center, Cube, Length, 2Points, 3D Exercises using Box. This tutorial shows how to created 3D objects using AutoCAD box command step by step. All the options are explained. At the end some 3D practice objects are created using box command. Other AutoCAD 3d commands used are Union, Substract, Copy. This tutorial also shows how to apply color to 3d object.