Adobe AFTER EFFECTS 5.5 Help Manual page 330

Adobe After Effects Help
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Composition, layer, and property functions (PB only)
value (layer, property) When used on the right side of an equation, obtains the value of
the specified property in the specified layer. When used on the left side, creates a keyframe
for the specified property.
velocity (layer, property) When used on the right side of an equation, obtains the
velocity of the specified property in the specified layer. When used on the left side, creates
a keyframe for the specified property.
effect_value (layer, effect index, property index) When used on the right side of an
equation, obtains the value of the effect property in the specified layer, indicated by the
effect index and the property index, using the order of effects in the Effect Controls window
(see "Specifying layers and properties (PB only)" on page 325). When used on the left side,
creates a keyframe for the specified effect property.
comp_audio_amplitude ( ) Obtains and normalizes the combined amplitude of all audio
layers in the composition at the current time, and returns a value between 0.0 and 1.0.
layer_audio_amplitude (layer) Obtains and normalizes the amplitude of the audio layer
at the current time, and returns a value between 0.0 and 1.0.
layer_size (layer) Obtains the original size of the layer in pixels as a vector with two
dimensions {width, height}. Any scaling of the layer is ignored.
layer_time_bounds (layer) Obtains the in and out times for the layer in seconds as a
vector with two dimensions {in time, out time}.
time ( ) Obtains the current time in seconds the script has reached.
tmap (t, statement) Evaluates statement at time t (in seconds) rather than at the current
time.
frame_num ( ) Obtains the frame number of the composition at the point the script is
currently sampling.
sample_num ( ) Obtains the current sample number that the script is currently running.
frame_to_time (f) Converts the frame number f to a time in seconds.
layer_to_comp (layer, v) Transforms the position vector v from layer coordinates in the
layer to composition coordinates. Use this function to transform the layer coordinates of
anchor points and effect point controls to composition coordinates.
comp_to_layer (layer, v) Transforms the position vector v from composition coordinates
to coordinates in the layer coordinate system for the layer. Use this function to transform
effect point control positions or anchor points from composition coordinates to layer
coordinates.
Substitution functions (PB only)
pop_layer (n) Obtains the layer selected in the Layer menu n.
pop_property (n) Obtains the property selected in the Property menu n.
pop_channel (n) Obtains the channel selected in the Channel menu n.
Math functions (PB only)
abs (a) Obtains the absolute value of a.
atan (a) Obtains the arc tangent of a.
atan2 (x, y) Obtains the arc tangent of the point x, y.
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Using Motion Math (PB only)
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