Apple Motion 4 - Manual (Page 1136)

Scale: Determines the magnitude of the effect. Defines the output range for the dabs
based on the mapped values between minimum (0) and maximum (1) speed, multiplied
by the value defined in the slider (or value field). This amount is then applied to the
channel (width, opacity, and so on) by multiplying (for width, opacity, spacing, and jitter)
or adding (for angle). This control is independent of the Scale parameter in the Stroke
pane.
Invert: This checkbox inverts the attributes of the stroke created by the behavior. For
example, if pen speed is set to affect the width of the stroke, thin areas of the stroke
become wide and wide areas become thin when the checkbox is selected.
HUD Controls
The parameters in the HUD are identical to the parameters in the Inspector.
Apply Pen Tilt
When you are using a stylus to create paint strokes using the paint stroke tool, this
behavior allows you to affect the width, opacity, spacing, angle, or jitter of the paint stroke
based on the tilt of the pen while creating strokes.
Note: A combination of Apply Pen Tilt shape behaviors can be used to affect more than
one parameter (such as Opacity, Width, or Jitter) of the stroke using the same tilt data.
Parameters in the Inspector
Apply To: Use this pop-up menu to select how your paint stroke is affected by the tilt of
your pen as you draw. There are five options:
• Width: The tilt of the stylus affects the width of the stroke. The greater the tilt, the wider
the stroke.
• Opacity: The tilt of the stylus affects the opacity of the stroke. The greater the tilt, the
more opaque the stroke.
• Spacing: The greater the tilt of the stylus, the greater the spacing in between the dabs
of the stroke.
• Angle: The greater the tilt of the stylus, the larger the value of the angle of the stroke.
• Jitter: The greater the tilt of the stylus, the larger the amount of jitter on the stroke.
Jitter randomizes the position of the paint dabs so they appear more like particles.
Calculate Tilt: The pen tilt is measured on two axes: X and Y. X represents the stylus
tilting to the right and left (toward the right or left side of the tablet); Y represents the
stylus tilting up and down (toward the top or bottom of the tablet). Use this pop-up menu
to select how the tilt of the stylus affects the stroke. There are five options:
• Absolute: Takes the maximum tilt from any axis.
• X Only: Measures the tilt only on the X axis.
• Y Only: Measures the tilt only on the Y axis.
1136 Chapter 17 Using Shapes, Masks, and Paint Strokes