Adobe AFTER EFFECTS 5.5 Help Manual page 331

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ceil (a) Obtains the smallest integer greater than or equal to a.
cos (a) Obtains the cosine of a, where a is in radians.
acos (a) Obtains the arc cosine of a, where a is a number between –1 and 1.
cross (a, b) Obtains the cross product of vectors a and b.
dist (a, b) Obtains the distance between vectors a and b.
dot (a, b) Obtains the dot product of vectors a and b.
fmod (a, b) Obtains the remainder that results from dividing a by b.
floor (a) Obtains the largest integer not greater than a.
round (a) Rounds a to the nearest integer.
log (a) Obtains the natural log of a.
exp (a) Obtains the result of raising the natural constant e to the power of a.
pow (a, b) Obtains the result of raising a to the power of b.
random (d) Returns a random vector with d dimensions (1–4). To obtain a single random
number, specify d as 1.
sqrt (a) Obtains the square root of a.
square (a) Obtains the square of a.
sin (a) Obtains the sine of a, where a is in radians.
asin (a) Obtains the arc sine of a, where a is a number between –1 and 1.
tan (a) Obtains the tangent of a, where a is in radians.
tangent (layer, property) Obtains the spatial tangent of the specified spatial property in
the specified layer. The property must be spatial, such as position. Use this function to
determine the direction of the spatial property's curve at the point the script is running.
deg_to_rad (a) Converts degrees a to its equivalent in radians.
rad_to_deg (a) Converts radians a to its equivalent in degrees.
length (v) Obtains the magnitude of vector v.
normalize (v) Creates unit vector from vector v in same direction.
Constants (PB only)
comp_width Width of the composition in pixels.
comp_height Height of the composition in pixels.
comp_size Dimensions of composition in pixels, as a two-dimensional vector.
comp_frame_duration Duration in seconds of 1 frame in the composition.
start_time Start time of the work area, in seconds.
end_time End time of the work area, in seconds.
step_time Duration in seconds of 1 Motion Math sample based on value set in the
Sample At control in the Motion Math window.
num_layers Number of layers in composition.
Mathematical operators (PB only)
+ add
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