Animating Depth: Tweening Movement - Flash 3D: Animation, Interactivity, and Games - page 55

3
Animating Depth:
Tweening Movement
The previous chapter explored visual depth cues and techniques that reproduce them
within a two-dimensional world such as Flash. These visual depth cues add dimension
to a still image. Let's review these visual cues. Figure 3.1 contains relative size,
interposition, shadows, aerial perspective, and texture gradients. This collection of
visual cues depicts depth to a certain degree. As the viewer, we can determine what is
foreground, middle ground, and background. As a static image, the scene has gone as
far as it can in portraying a three-dimensional world.
Figure 3.1 Combined depth cues
Movement further enhances our perception of depth. Animation is an illusion. It is a
representation of movement or change in time. In Flash, animation can be achieved
through the movement of an object's position or a change in its appearance over time.
The key words are change and time . Each Flash file contains a Timeline that allows