Adobe After Effects CS3 Manual de usuario Pagina 581

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AFTER EFFECTS CS3
User Guide
576
Returns the lights shadow darkness value as a percentage.
shadowDiffusion Return type: Property.
Returns the lights shadow diffusion value, in pixels.
DavidVanBrinkprovidesaninstructionalblogpostandsampleprojectthatshowhowtouseexpressionswithlights:
www.adobe.com/go/learn_ae_ominoflashing.
See also
Cameras, lights, and points of interest” on page 176
Effect attributes and methods
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
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 masks opacity value as a percentage.
maskFeather Return type: Property.
Returns the masks feather value, in pixels.
maskExpansion Return type: Property.
Returns the masks 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, Array, or String.
Returns the property’s value at the current time.
valueAtTime(t) Return type: Number or Array.
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