By default, the 3DOrbit command rotates around the center of your AutoCAD model. When you’re working on a specific part of a 3D model, that rotation centroid may not work for you. In this video tip from Cadalyst and Lynn Allen, you’ll see how to take control of the 3DOrbit command and select your own centroid for rotation. For more CAD tips, visit http://www.cadalyst.com……
Source: Autodesk