Motion

Exits are quicker than entrances

Leave in about two thirds of the time it took to arrive.

Two lanes. In the top lane a square arrives over a long bar. In the bottom lane a square leaves over a bar about two thirds as long. enter: 0.9 sexit: 0.585 s (65%)

Takeaways

  • 60 to 70 percent of the entrance duration.
  • Entrances decelerate; exits accelerate.
  • Prefer no exit at all: let the next shot replace it.

What it means

An arrival needs to be seen and understood; a departure only needs to get out of the way. A fast exit reads as intent, a slow one as lag. Better still, let the cut or the transition be the exit.

In a RasanAI film

Exit durations are scaled to about 65 percent of the matching entrance and use an accelerating curve. Entrances ease out only; an ease-in on an entrance is flagged as lag.

Origins and sources

Apple Human Interface Guidelines, Motion; and Disney's slow in and slow out. The 65 percent figure is measured from real launch films. Read the source.

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