Introduction to 3D Design - Autodesk AutoCAD 2013 Practical 3D Drafting and Design - page 15

Note
As in 2D, rotating the wheel mouse forward, we zoom in; rotating the wheel
backward, we zoom out; all related to cursor position. To automatically orbit
around the model, we hold down SHIFT and the wheel simultaneously. The curs-
or changes to two small ellipses and then we drag the mouse to orbit around the
model. Visualization is the subject of the next chapter.