Adobe After Effects CS4 Manual de usuario Pagina 682

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USING AFTER EFFECTS CS4
Expressions
Last updated 12/21/2009
Returns the cone angle of a light, in degrees.
coneFeather Return type: Property.
Returns the cone feather value of a light as a percentage.
shadowDarkness Return type: Property.
Returns the shadow darkness value of a light as a percentage.
shadowDiffusion Return type: Property.
Returns the shadow diffusion value of a light, in pixels.
David Van Brink provides an instructional article and sample project on his omino pixel blog that show how to use
expressions with lights.
More Help topics
Cameras, lights, and points of interest” on page 186
Effect attributes and methods (expression reference)
active Return type: Boolean.
Returns true if the effect is turned on (the Effect switch is selected).
param(name) Return type: Property.
Argument type: name is a String.
Returns a property within an effect. Effect control points are always in layer space. Example:
effect("Bulge").param("Bulge Height")
param(index) Return type: Property.
Argument type: index is a Number.
Returns a property within an effect. Effect control points are always in layer space. For example,
effect("Bulge").param(4) returns the Bulge Height property.
Mask attributes and methods (expression reference)
Note: You can link Mask Path properties to other path properties (paths in a shape layer and brush strokes), but the
properties are not accessible for direct numerical manipulation through expressions.
maskOpacity Return type: Property.
Returns the opacity value of a mask as a percentage.
maskFeather Return type: Property.
Returns the feather value of a mask, in pixels.
maskExpansion Return type: Property.
Returns the expansion value of a mask, in pixels.
invert Return type: Boolean.
Returns true if the mask is inverted or false if it is not.
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