Adobe AFTER EFFECTS 7.0 - Chapter 19: Rendering and exporting; Rendering a movie; Supported file formats for output

ADOBE AFTER EFFECTS 7.0
User Guide
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param(name) Return type: Property.
Argument type: name is a String.
Returns a property within an effect. Effect point controls are always in layer space. Example:
effect("Bulge")("Bulge
Height")
param(index) Return type: Property.
Argument type: index is a Number.
Returns a property within an effect. Effect point controls are always in layer space. For example,
effect("Bulge")(4)
returns the Bulge Height property.
Mask attributes and methods
Note: You cannot access the mask shape with an expression.
maskOpacity Return type: Property.
Returns the mask’s opacity value as a percentage.
maskFeather Return type: Property.
Returns the mask’s feather value, in pixels.
maskExpansion Return type: Property.
Returns the mask’s expansion value, in pixels.
invert Return type: Boolean.
Returns true if the mask is inverted or false if it is not.
Property attributes and methods
value Return type: Number or Array.
Returns the property’s value at the current time.
valueAtTime(t) Return type: Number or Array.
Argument type: t is a Number.
Returns the property’s value at the specified time, in seconds.
velocity Return type: Number or Array.
Returns the temporal velocity value at the current time. For spatial properties, such as Position, it returns the tangent
vector value. The result is the same dimension as the property.
velocityAtTime(t) Return type: Number or Array.
Argument type: t is a Number.
Returns the temporal velocity value at the specified time.
speed Return type: Number.
Returns a 1D, positive speed value equal to the speed at which the property is changing at the default time. This
element can be used only for spatial properties.
speedAtTime(t) Return type: Number.