Adobe After Effects CS3 Manual de usuario descargar pdf (Pagina 566)

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AFTER EFFECTS CS3

User Guide

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Represents the layer containing the expression. Because thisLayer is the default object, its use is optional. For

example, you can start an expression with

thisLayer.width or width and get the same result.

thisProperty Return type: Property.

Represents the property containing the expression. For example, if you write an expression on the Rotation property,

you can start an expression with

thisProperty to refer to the Rotation property.

time Return type: Number.

Represents the composition time, in seconds, at which the expression is being evaluated.

colorDepth Return type: Number.

Returnstheproject’scolordepthvalue.Forexample,

colorDepth returns 16 when the project’s color depth is 16 bits

per channel.

posterizeTime(framesPerSecond) Return type: Number.

Argument type: framesPerSecond is a Number.

The framesPerSecond value becomes the frame rate from which the rest of the expression operates. This allows you

to set the expression to a frame rate lower than that of the composition. For example, the following expression

updates the property value with a random value once per second:

posterizeTime(1);

random()

value Return type: Number, Array, or String.

Represents the value at the current time for the property containing the expression.

Time conversion methods

timeToFrames(t = time + thisComp.displayStartTime, fps = 1.0 / thisComp.frameDuration, isDuration = false)

Return type: Number.

Argument type: t and fps are Numbers; isDuration is a Boolean.

Converts the value of t, which defaults to the current composition time, to an integer number of frames. The number

of frames per second is specified in the fps argument, which defaults to the frame rate of the current composition

(

1.0 / thisComp.frameDuration). The isDuration argument, which defaults to false, should be true if the t value

represents a difference between two times instead of an absolute time. Absolute times are rounded down towards

negative infinity; durations are rounded away from zero (up for positive values).

framesToTime(frames, fps = 1.0 / thisComp.frameDuration) Return type: Number.

Argument type: frames and fps are Numbers.

The inverse of

timeToFrames. Returns the time corresponding to the frames argument,whichisrequired.Itdoesn’t

have to be an integer. See

timeToFrames for explanation of the fps argument.

timeToTimecode(t = time + thisComp.displayStartTime, timecodeBase = 30, isDuration = false) Return type: String.

Argument type: t and timecodeBase are Numbers; isDuration is a Boolean.

Converts the value of t to a String representing timecode. See

timeToFrames for an explanation of the t and

isDuration arguments. The timecodeBase value, which defaults to 30, specifies the number of frames in one second.

timeToNTSCTimecode(t = time + thisComp.displayStartTime, ntscDropFrame = false, isDuration = false) Return

type: String.

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Adobe After Effects CS3 Manual de usuario Pagina 566

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