Adobe After Effects CS4 Manual de usuario descargar pdf (Pagina 688)

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USING AFTER EFFECTS CS4

Expressions

Last updated 12/21/2009

m = thisLayer.marker.nearestKey(time);

s = "time:" + timeToCurrentFormat(m.time) + "\r" +

"duration: " + m.duration + "\r" +

"key index: " + m.index + "\r" +

"comment:" + m.comment + "\r" +

"chapter:" + m.chapter + "\r" +

"URL:" + m.url + "\r" +

"frame target: " + m.frameTarget + "\r" +

"cue point name: " + m.cuePointName + "\r" +

"Event cue point? " + m.eventCuePoint + "\r";

for (param in m.parameters){

s += "parameter: " + param + " value: " + m.parameters[param] + "\r";

}

Because the XMP metadata in a footage item can be converted into layer markers for a layer based on that item,

expressions can interact with XMP metadata. For information, see

“XMP metadata in After Effects” on page 626.

Dan Ebberts provides a tutorial on the After Effects Developer Center that includes an example of using XMP metadata

with expressions.

duration Return type: Number.

Duration, in seconds, of marker.

comment Return type: String.

Contents of Comment field in marker dialog box.

chapter Return type: String.

Contents of Chapter field in marker dialog box.

url Return type: String.

Contents of URL field in marker dialog box.

frameTarget Return type: String.

Contents of Frame Target field in marker dialog box.

eventCuePoint Return type: Boolean.

Setting for cue point type in marker dialog box. True for Event; false for Navigation.

cuePointName Return type: String.

Contents of cue point Name field in marker dialog box.

parameters Return type: associative array of String values.

Contents of Parameter Name and Parameter Value fields in marker dialog box.

For example, if you have a parameter named “background color”, then you can use the following expression to access

its value at the nearest marker:

thisComp.marker.nearestKey(time).parameters["background color"]

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