Adobe AFTER EFFECTS CS3 PROFESSIONAL User Manual page 304

Expand the Range Selector 1 and click the stopwatch icon for Start.
5
In the Composition panel, drag the start selector to the left edge of the text (the value will be at 0).
6
Move the current-time indicator to 5 seconds and drag the start selector in the Composition panel to the right
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edge of the text (the value will be 5).
8 Preview the composition.
Note: By default, the Smoothness property is set to 100%. To create a typewriter appearance, expand the Advanced
property and set Smoothness to 0%.
See also
"Create a composition" on page 112
"Enter point text" on page 273
"Work with selectors" on page 287
"Set keyframes" on page 189
"Preview video and audio" on page 124
Example: Animate text with multiple selectors
This example uses the
selectorValue
and off randomly.
Create a new composition.
1
Create a new text layer.
2
3 In the Timeline panel, choose Opacity from the text layer's Animate menu.
Expand the text layer and its animator in the Timeline panel.
4
5 Select the Range Selector and delete it.
Choose Add > Selector > Wiggly next to the text layer's Animator property group.
6
Choose Add > Selector > Expression. If the Wiggly selector doesn't come before the Expression selector, drag the
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Wiggly selector above the Expression selector.
Expand the Expression Selector.
8
Expand the Amount property to reveal the expression. The following expression appears by default:
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selectorValue * textIndex/textTotal
Replace the default expression text with the following expression:
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r_val=selectorValue[0];
if(r_val < 50)r_val=0;
if(r_val > 50)r_val=100;
r_val
Set the opacity to 0%, and preview the composition.
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parameter with the Wiggly selector to make a string of characters flash on
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User Guide