Angle snap determines the incremental rotation for a number of features in 3D Studio MAX, including the standard Rotate transform. As you rotate an object (or group of objects), the object moves around a given axis in the increment you set.
Angle snap also affects Pan/Orbit camera controls, FOV and Roll camera settings, and Hotspot/Falloff spotlight angles.
The angle increment is set in the Grid and Snap Settings dialog. Right-click the Angle Snap button to display the Grid and Snaps Settings dialog box. The default is 5 degrees.
When turned on, angle snap affects all rotational transforms.
When you move an object with snap set, a pair of buttons in the status line determine the kind of snapped move you can make.