ADOBE AFTER EFFECTS 7.0
User Guide
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Parameters Are Set At Specifies whether parameters can be animated for individual waves. Birth specifies that each
wave maintains the same parameter settings over time. Each Frame specifies that the waves change as the parameters
change. For example, if you create a star wave with an animated rotation property, select Birth to offset each star from
the previous one to create a twisting tunnel effect, or select Each Frame to make all the stars rotate in unison as the
rotation property changes.
Render Quality Controls the quality of the output. Radio Waves renders a smooth, anti-aliased shape for every shape
by rendering a high-resolution version of the shape and then scaling it down in a process called oversampling. For
example, to create a 100x100-pixel image, it may first generate a 400x400-pixel image and then scale it down using
4x oversampling. Oversampling provides high-quality results but result in long render times. This option works only
when in Best quality mode.
Wave Type Specifies the type of wave you want to create.
Polygon Specifies the appearance of the polygon shape used for the wave. This control is available when Polygon is
chosen for Wave Type.
• Sides Specifiesthetypeofpolygonalshapeyouwanttoproduce.Threesidescreateatriangle,fourcreateasquare,
and so on. Size values above 64 result in a smooth circle. You can also create a circle by setting Sides to 3, Curve Size
to 1, and Curvyness to about 0.62.
• Curve Size Specifies how much of each side is curved at each point.
• Curvyness Specifies how extreme the curve is at each point of the wave.
• Star Specifies that the polygon is shaped like a star. To change the number of points on the star, change the
number of sides.
• Star Depth Specifies the star’s angles by controlling the distance between inner points and the star’s center.
Mask Specifies the mask used to create a wave. This control is available when you choose Mask from the Wave Type
pop-up menu.
Image Contour controls for the Radio Waves effect
Image Contour controls specify the image you want to use as the wave and controls how the image appears. These
controls are available when Image Contours is chosen for Wave Type.
Source Layer Specifies the layer you want to use as the shape of the wave. Select an animated layer to emit moving
shapes. A well-defined outline, high-contrast grayscale layer, or alpha channel works well as a source. The Radio
Waves effect detects edges and converts sources into outlines.
Source Center Specifies the center point of the shape, relative to the source layer. For example, if you isolate a shape
thatispositionedinthelefthalfoftheframe,theshaperadiatestotheleftbydefault;youcanmovethesourcecenter
anywhere on the layer.
Value Channel Specifies the channel of the layer that defines the wave shape.
Invert Input Inverts the chosen value channel option.
Value Threshold Specifies the threshold for the chosen value channel. It determines the percentage value at which
everythingbelowitoraboveitismappedtoeitherwhiteorblack.Thiscontrolcanmakeabigdifferenceintheshape
of the wave.
Pre-Blur Smooths out the value channel before the value threshold is sampled. If you have a high-contrast image,
such as white on black, and you want the wave to follow the edges very closely, set this to 0.
Tolerance Defines how tightly the wave conforms to the layer. A very high setting results in sharp corners; a very
low value can make the wave shape more sensitive to noise.
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