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Layer Properties attributes and methods (expression reference)
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 coordinate system of the layer (layer space).
- position
- Return
type: Property [2 or 3].
Returns the position value of the
layer, in world space if the layer has no parent. If the layer has
a parent, returns the position value of the layer in the coordinate system
of the parent layer (in the layer space of the parent layer).
- 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].
Returns the value of the Audio Levels
property of the layer, in decibels. This value is a 2D value; the
first value represents the left audio channel, and the second value
represents the right. The value is not the amplitude of the audio
track of the source material. Instead, it is the value of the Audio
Levels property, which may be affected by keyframes.
- timeRemap
- Return
type: Property.
Returns the value of the Time Remap property,
in seconds, if Time Remap is enabled.
- marker.key(index)
- Return
type: MarkerKey.
Argument type: index is
a Number.
Returns the MarkerKey object of the layer marker
with the specified index.
- marker.key(name)
- Return type: MarkerKey.
Argument type: name is
a String.
Returns the MarkerKey object of the layer marker
with the specified name. The name value is the
name of the marker, as typed in the comment field in the marker
dialog box, for example, marker.key("ch1"). If
more than one marker on the layer has the same name, this method
returns the marker that occurs first in time (in layer time). The
value for a marker key is a String, not a Number.
This expression
on a property ramps the value of the property from 0 to 100 between
two markers identified by name:
m1 = marker.key("Start").time;
m2 = marker.key("End").time;
linear(time, m1, m2, 0, 100);
- marker.nearestKey(t)
- Return
type: MarkerKey.
Argument type: t is a
Number.
Returns the layer marker that is nearest in time
to t. For example, this expression returns the
time of the marker on the layer nearest to the time of 1 second:
marker.nearestKey(1).time
This
expression returns the time of the marker on the layer nearest to
the current time:
marker.nearestKey(time).time
- marker.numKeys
- Return
type: Number.
Returns the total number of markers on the
layer.
- name
- Return
type: String.
Returns the name of the layer.
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