You can place an image or video clip in a 3D view background for use as a reference. When using a video clip, each frame in the video clip advances as the frames increment in the timeline.
You can cache rotoscoped images for better playback.
To display: Choose Rotoscopy Options in a 3D view's Display Mode menu.
For more information on using rotoscopy in general, see Rotoscopy [Viewing and Playback].
Controls how rotoscoped sequences are cached for faster playback.