Apple Motion 5.1.1 - Manual (Page 882)

Chapter 20 Shapes, masks, and paint strokes 882
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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.
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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.
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Accelerate: The stroke is drawn with increasing speed.
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Decelerate: The stroke is drawn with decreasing speed.
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Natural: The speed at 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 along more
quickly as it moves toward the low point of the U, and more slowly as it moves up the edges.
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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.
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Custom: Lets you 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.
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Custom Speed: A slider that 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.
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End Offset: A slider that 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.
Create “write-on” paint strokes
To create a paint stroke that appears over the course of several frames, select the Write On
checkbox in the Paint Stroke Tool HUD. After you create the stroke, additional parameters
become available in the Behaviors Inspector.
Paint a stroke over time
1 In the toolbar, click the Paint Stroke tool (or press P).
The Paint Stroke Tool HUD appears. If the HUD does not appear, press F7 or D.
2 In the Tool HUD, select the Write On checkbox and any other desired stroke settings.
3 In the Canvas, create your stroke.
4 When you complete stroke, press Esc to exit the paint mode.
The Paint Stroke Tool HUD is replaced with the Shape HUD. In the Layers list, a Write On Shape
behavior is applied to the stroke. To modify the Write On parameters, select the behavior and use
the HUD or the Behaviors Inspector.
The speed at which the stroke is “painted” (including the duration it took to draw the stroke) is
mapped over the time extent (in frames) of the stroke. The faster a stroke is drawn, the shorter
the duration of the Write On behavior.
Note: If your Motion Project Preferences Create Layers At option is set to Current Frame, the
paint stroke is created at the current playhead position. If set to Start of Project, the stroke is
created at frame 1.
5 Play back your project.
The stroke is “painted on” as the project plays.
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