Apple Motion 4 - Manual (Page 700)

Image Source: This parameter, which becomes available when the Shape parameter is
set to Image, allows you load an image object as the source for the replicator shape. To
set the image source, drag an image from the Layers tab or Timeline layers list to the
Image Source well.
Emission Alpha Cutoff: When the Image Source object contains an alpha channel, this
slider defines the minimum opacity value that is necessary to create an element at that
point on the source image. For example, when set to 25%, elements only appear at points
where the alpha value of the image is equal to or greater than 25% opacity. The lower
the Emission Alpha Cutoff value, the more cells appear. In order for this parameter to be
effective, the alpha channel needs to have areas of varying transparency.
Shape with a feathered edge used
as Image Source Emission Alpha Cutoff set to 75% Emission Alpha Cutoff set to 30%
Start Point: This parameter is available when Shape is set to Line or Wave. Two sliders
define, in X, Y, and Z coordinates, the first point of the line or wave on which the elements
are positioned. Click the disclosure triangle to access the Z Start Point value slider. You
can adjust these values in the Canvas using the onscreen controls (with the Adjust Item
tool).
End Point: This parameter is available when Shape is set to Line or Wave. Two sliders
define, in X, Y, and Z coordinates, the second point of the line or wave on which the
elements are positioned. Click the disclosure triangle to access the Z Start Point value
slider. You can adjust these values in the Canvas using the onscreen controls (with the
Adjust Item tool).
Size: This parameter is available when Shape is set to Rectangle or Box and Arrangement
is set to Outline, Tile Fill, or Random Fill. Click the disclosure triangle to display separate
Width, Height, and Depth (for the Box shape) parameters. When Circle is the selected
shape, this parameter becomes Radius.
Note: For projects using the default camera settings and a default Z position for the
replicator (the replicator has not been transformed in 3D space), the Height is measured
in pixels, however, the Width is measured in square pixels. This is done so that a shape
that is numerically square appears square when “Correct for Aspect Ratio” is selected in
the View pop-up menu in the top-right corner of the Canvas.
700 Chapter 12 Using the Replicator