By Marcus Geduld

Placed the ability of Expressions to paintings on your animations with controls and efficiencies most unlikely to accomplish with conventional keyframing innovations. <BR id="CRLF">No programming abilities are required. starting place techniques and talents orient the recent dressmaker and function a convenient connection with the skilled one. fundamentals of constructing Expressions, variables, instructions, and Expression helpers precede the jump into JavaScript and math necessities for extra complex Expressions that come with randomness and actual simulations. <BR id="CRLF">Full colour illustrations show the scripts and the ensuing results, choose Whip concepts, and sequential animations. Downloadable spouse documents comprise QuickTime video clips of the demo animations, and AE venture records that allow you to envision the Expressions.

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Opacity. Notice also that I printed that last Expression in red. In this book, I will print any Expression—or any part of an Expression—created using the Pick Whip in red type. Later in this book, when you’re used to using the Pick Whip, I won’t even Creating Simple Expressions CHAPTER 1 have to mention it. ” Let’s try some more Pick Whipping: 7. Remove the Expression. 8. Add an Expression to Scale. 9. Pick Whip Position. I’ve used some shorthand here. By “Pick Whip Position,” I mean drag the Pick Whip and drop it on the Position property (on the word “Position”).

Rotation ϭ the number of eggs in my refrigerator Maybe someday. By the way, you could have written that earlier Expression as 45ϩ10Ϫ2 (without the spaces) or, if you’re a bit eccentric, as 45 ϩ10 Ϫ 2. JavaScript is pretty lax about spacing. Different people will space out Expressions in different ways. So you should get used to slight variations in people’s styles of Expression-writing. 45 ϩ10 Ϫ 2 and 45ϩ10Ϫ2 both work the same way. 11 PART 1 Using Expressions You’ll rarely (if ever) write Expressions that are just arithmetic problems, so I don’t want to bore you with them for much longer.

So if you hate math, you can heave a big sigh of relief. But before we move on, spend a little time playing around with the Expression. opacity ϩ 1 ϩ 1 ϩ 1 ϩ 1 ϩ 1 ϩ 1 All of those—especially the last one—are silly, but they prove, once again, that as long as the Expression resolves into a number, it will control Rotation. 6 Now, as you scrub Opacity from 0 to 100, the layer will rotate from 0 to 360—a full circle! We’ve really broken through the 0-to-100 barrier now. It’s not important that you understand how that last Expression works.

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