Adobe After Effects CS3 Manual de usuario descargar pdf (Pagina 576)

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AFTER EFFECTS CS3

User Guide

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Returnstrueifthelayer’sVideoswitch isonandthecurrenttimeisbetweenthelayer’sInpointandOutpoint;

false otherwise.

audioActive Return type: Boolean.

Returnstrueifthelayer’sAudioswitch isonandthecurrenttimeisbetweenthelayer’sInpointandOutpoint;

false otherwise.

sampleImage(point, radius = [.5, .5], postEffect=true, t=time) Return type: Array [4].

Argument type: point is an Array [2], radius is an Array [2], postEffect is a Boolean, and t is a Number.

Samples the color and alpha channel values of a layer and returns the average alpha-weighted value of the pixels

within the specified distance of the point as an array: [red, green, blue, alpha]. If postEffect istrue,thesampledvalues

are for the layer after masks and effects on that layer have been rendered; if postEffect is false, the sampled values are

for the layer before masks and effects have been rendered. The input value point is in layer space; the point [0,0] is

the center of the top-left pixel in the layer. The input value radius specifies the horizontal and vertical distance from

the sample center to the edges of the sampled rectangle. The default value samples one pixel.

Note: The

postEffect parameter refers to effects applied directly to the layer, not to effects applied indirectly, such as

with an adjustment layer.

This example samples a rectangle 4 pixels wide and 3 pixels high, centered around a point 100 pixels down and to

the right of the upper-left corner of the layer:

thisComp.layer(1).sampleImage([100, 100], [2, 1.5])

Dan Ebberts has an example of how to use the sampleImage method on his website:

www.adobe.com/go/learn_ae_danobscuration.

Layer Properties attributes and methods

When you add masks, effects, paint, or text to a layer, After Effects adds new properties to the Timeline panel. There

are too many of these properties to list here, so use the pick whip to learn the syntax for referring to them in your

expressions.

anchorPoint Return type: Property [2 or 3].

Returns the anchor point value of the layer in the layer’s space.

position Return type: Property [2 or 3].

Returns the position value of the layer, in world space if the layer has no parent or in the parent’s layer space if there

is a parent.

scale Return type: Property [2 or 3].

Returns the scale value of the layer, expressed as a percentage.

rotation Return type: Property.

Returns the rotation value of the layer in degrees. For a 3D layer, it returns the z rotation value in degrees.

opacity Return type: Property.

Returns the opacity value for the layer, expressed as a percentage.

audioLevels Return type: Property [2].

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Adobe After Effects CS3 Manual de usuario Pagina 576

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