Adobe After Effects CS4 Manuel d'utilisateur télécharger pdf (Page 693)

687

USING AFTER EFFECTS CS4

Expressions

Last updated 12/21/2009

timeToStop = 4;

if (time > timeToStop){

value;

}else{

wiggle(3,25);

}

• Apply the following expression to a property to start wiggling it at time 2 seconds and stop wiggling it at time 4

seconds:

timeToStart = 2;

timeToStop = 4;

if ((time > timeToStart) && (time < timeToStop)){

wiggle(3,25);

}else{

value;

}

More Help topics

“Add, edit, and remove expressions” on page 647

Expression example: Match camera focal plane to another layer

❖ Apply the following expression to the Focus Distance property of a camera layer to have its focus distance match

the distance to the anchor point of a layer named “target”:

target = thisComp.layer("target");

V1 = target.toWorld(target.anchorPoint) - toWorld([0,0,0]);

V2 = toWorldVec([0,0,1]);

dot(V1,V2);

More Help topics

“Add, edit, and remove expressions” on page 647

“Create a camera layer and change camera settings” on page 186

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