Apple Motion 3 - Manual (Page 1064)

1064 Chapter 12 Using Shapes and Masks
Basic Motion and Simulation behaviors animate multiple parameters of a shape
parameters, such as Position, Rotation, and Scale. Applying behaviors to shapes works
the same as with any layer in Motion, and keyframed animation of any of these
parameters is stored in the Keyframe Editor.
For more information on using Basic Motion, Parameter, and Simulation behaviors, see
“
Using Behaviors ” on page 369.
Using the Shape Behaviors
Shape behaviors are specifically designed to be applied to shapes created within
Motion. After drawing a stroke or other shape, apply a Shape behavior to wriggle,
oscillate, or randomize a shape’s control points or to map pen pressure to various paint
stroke characteristics.
Apply Pen Pressure
This behavior is designed to be applied to a paint stroke created using a stylus and
graphics tablet. Once a stroke is created, this behavior allows you to affect the width,
opacity, spacing, angle, or jitter of the paint stroke based on the pressure of your stylus
on the tablet when the stroke was created. The parameters in the HUD are identical to
the parameters in the Inspector.
Note: In the Paint Stroke Tool HUD, you can select how the pressure of the stylus
affects the stroke before the stroke is created. Applying the Pen Pressure behavior
allows you to affect more than one parameter (such as Opacity, Width, or Jitter) of the
stroke using the same pressure data. To further modify the stroke after its creation, use
the associated parameters in the Stroke or Style pane.
Apply To: Use this pop-up menu to select how your paint stroke is affected by pen
pressure.
 Width: Pen pressure affects the width of the stroke. The harder the pressure, the
wider the stroke.
 Opacity: Pen pressure affects the opacity of the stroke. The harder the pressure, the
more opaque the stroke.
 Spacing: The harder the pressure, the greater the spacing in between the dabs of
the stroke.
 Angle: The harder the pressure, the greater the angle of the stroke dabs.
 Jitter: The harder the pressure, the larger the amount of jitter on the stroke. Jitter
randomizes the position of the paint dabs so that they appear more like particles.