- Timing: The speed of an action determined by the number of frames between poses. A fast action (like a punch) might take 2-4 frames, while a slow, heavy movement (a giant lifting a foot) could span 12-24 frames. Timing dictates the perceived weight, speed, and mood of a character. Adjusting timing is the simplest way to change the feeling of a motion.
- Spacing: The distribution of positions within that timing. Even spacing creates mechanical motion, while accelerating spacing (slow out) gives a natural ease. For example, a bouncing ball slows at the top of the arc (close frames) and speeds up near the ground (wide frames). Spacing is the key to organic, non-linear movement.
- Frame Rate: Typically 24 frames per second (fps) for film, 30 fps for broadcast, and 60 fps for games. Animators work on twos (holding a pose for two frames) to reduce workload, but critical fast actions need ones (every frame). Understanding frame rate helps plan key poses and in-betweens.
- Key Poses and In-betweens: Key poses define the major positions of an action. In-betweens fill the gaps to create smooth motion. In traditional animation, a lead animator draws keys and a junior handles in-betweens. In digital animation, software interpolates, but understanding spacing helps avoid robotic results.
- Slow In and Slow Out: The principle where actions start slowly, accelerate, and decelerate. A pendulum swings fastest at the bottom, slowest at the extremes. Applying this to characters adds realism: a hand reaching for a cup starts slow, speeds up, then slows as it grasps. Without it, motion feels stiff.
- Easing Curves: Graphical representation of spacing in animation software. A curve with a flat start (slow in) and steep middle (fast) creates a natural ease. Linear curves give mechanical motion. Learning to read and edit these curves is essential for controlling spacing precisely.
- Frames vs. Seconds: Thinking in frames rather than seconds helps precision. A 1-second action at 24 fps equals 24 frames. Breaking actions into frame counts (e.g., 6 frames for anticipation, 4 frames for the action, 14 frames for follow-through) enhances deliberate planning.
- Timing Charts: In traditional animation, a timing chart on a keyframe indicates spacing for in-betweens. Slashes close together mean slow movement; wide slashes mean fast. This classic technique translates to digital curve editors.
Principle: Timing and Spacing Interdependence
Definition: Timing and spacing are not independent; together they define the acceleration and deceleration of motion. Changing one without adjusting the other alters the perceived force and weight. For example, keeping the same spacing but doubling the timing creates a sluggish action, while halving timing with unchanged spacing creates a snappy one.
Application: When animating a character jumping, first establish the timing (e.g., 12 frames for the ascent, 6 for the apex hang, 12 for the descent). Then adjust spacing so frames are closer at the top of the jump (slow out) and wider at takeoff and landing (fast). Test by scrubbing the timeline; if the motion feels floaty, tighten timing or adjust easing curves.
- Timing controls the speed of an action via frame count; spacing controls the distribution of frames.
- Slow in and slow out (easing) create natural acceleration and deceleration.
- Frame rate (24/30/60 fps) determines how many frames per second; animators often work on twos but use ones for fast action.
- Key poses define action, in-betweens smooth motion; timing charts and curve editors help manage spacing.