Apple Motion 3 - Manual (Page 1078)

1078 Chapter 12 Using Shapes and Masks
 Constant: The stroke is drawn at a steady speed from the first to the last point in the
stroke.
 Ease In: The drawing of the stroke starts at a slow speed, then reaches and maintains
a steady speed through the last point on the stroke.
 Ease Out: The drawing of the stroke starts at a steady speed, then slows down as it
gradually decelerates to a stop at the last point of the stroke.
 Ease Both: The drawing of the stroke slowly accelerates from the first point on the
stroke, and then slows down as it gradually decelerates to a stop at the last point of
the stroke.
 Accelerate: The stroke is drawn with increasing speed.
 Decelerate: The stroke is drawn with decreasing speed.
 Natural: The speed in which the stroke is drawn along the path is determined by the
shape of the path. For example, if the stroke is a U-shape curve, the stroke is drawn
on more quickly as it moves toward the low point of the U, and more slowly as it
moves up the edges.
 Recorded: This option only appears if there is a recorded time over which the stroke
was drawn. In other words, if a shape is converted to a paint stroke, this parameter
does not appear. If the paint stroke is created with the Paint Stroke tool in the
Toolbar (using a stylus or mouse), this option does appear.
 Custom: Custom allows you to draw the stroke along its path by setting keyframes
for the stroke’s speed from 0 to 100%. In other words, you determine what portion of
the stroke is drawn along its path in time.
 Custom Speed: This parameter becomes available when Speed is set to Custom.
You can modify the Custom Speed velocity curve in the Keyframe Editor. For
example, you can keyframe custom values to draw a stroke forward to a specific
percentage of its path, then backward, then forward, and so on before it reaches
the end of the animation.
End Offset: This slider offsets the end of the behavior inward from the defined Out
point and holds the last value. In other words, it offsets the visible paint stroke from the
end of the path of the stroke.
Creating a Write On Paint Stroke Using the Paint Stroke Tool
This section describes creating a “write-on” paint stroke using the Paint Stroke tool in
the Toolbar. To create a paint stroke that appears over the course of several frames,
select the Write On checkbox. Once the stroke is created, additional parameters
become available in the Behavior tab of the Inspector.
To paint a stroke over time:
1 In the Toolbar, click the Paint Stroke tool (or press P).
The Paint Tool HUD appears. If the HUD does not appear, press F7 or D.
2 In the HUD, select the Write On checkbox and select any other desired stroke settings.