As AutoCAD becomes more complex, the online documentation has a harder time keeping up. For example, the 3dOrbit command (which used to be what the 3dFOrbit command is now -- clear?) has this option in its shortcut menu: Animation Settings.
The options in the Animation Settings dialog box hint at recording to files. There's AVI, MOV, MGP, and WMV listed, along with frame rates and resolution. But the online docs for 3dOrbit don't tell us how to record the animation.
The solution is found in the 3D Navigation control panel of the new Dashboard: look for the colorful Play-Record-Pause-and-Stop strip of buttons:
Record - records the movement in the viewport.
Pause - pauses the recording until Record is clicked again.
Stop - stops recording, and prompts us for a file name.
Play - prompts us to select a file name, and then plays back the movie file in an independent window.
(If we click Play instead of Stop, the animation is immediately played back in the window, but is not saved.)
It's too bad this recording feature does not extend to all areas of AutoCAD, so that we could record any other commands, such as Line, Move, and SplinEdit.