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Flash Tip: Creating the Illusion of Speed Distortion

By Adrien-Luc Sanders, About.com

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Introduction

Your standard Flash motion tween lets you move objects from point A to point B just by setting two keyframes at those points and letting Flash do the rest of the work. While this makes for easy animation, it also makes for mildly dull animation; leaving it as-is is useful for simple things, but if you want to add life then it helps to work in a little bounce to your motion. Animation is about exaggeration of real motion—making it larger than life.

One such exaggeration is the illusion of distortion from speed. We’ve all seen the cartoons where something or someone goes dashing across the screen so quickly that the resisting force of their own momentum causes them to streeeeeetch backwards in the direction opposite their trajectory of motion—only to stop so abruptly that the force throws them forward from their stopping point, then back, over and over until the energy of motion dissipates. While it’s hard to visualize something as solid as your car doing that, you can still see a minute example of that principle when you watch your car come to a skidding halt in side profile; although the tires halt at one point of the pavement, the actual chassis of the car continues its forward motion until the firmly-planted position of the base reels it in, jerks it backwards, and sets that “bounce” into motion.

So let’s work on adding that sort of exaggerated bounce into a simple animation, by taking the moving box above and distorting its shape.

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