Apple Motion 5.1.1 - Manual (Page 873)

Chapter 20 Shapes, masks, and paint strokes 873
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Scale: A slider that sets the magnitude of the effect. The Scale slider defines the output range
for the dabs based on the mapped values between minimum (0) and maximum (1) pressure,
multiplied by the value defined in the slider (or adjacent value slider). This amount is then
applied to the parameter (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.
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Invert: A checkbox that inverts the attributes of the stroke created by the behavior. For
example, if pen pressure is set to affect the opacity of the stroke, transparent areas of the
stroke become more opaque and opaque areas become more transparent when the checkbox
is selected.
Apply Pen Speed
When using a stylus or mouse to create paint strokes, this behavior controls the width, opacity,
spacing, angle, or jitter of the paint stroke based on the speed of your pen strokes. (A paint stroke
created using a mouse can also be affected by the Apply Pen Speed behavior.) 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 speed of the stylus affects the stroke
before the stroke is created. Use the Pen Speed behavior to affect more than one parameter
of the stroke (such as Opacity, Width, or Jitter) using the same pressure data. The Pen Speed
parameter also appears in the Advanced pane of the Shape Inspector.
Parameters in the Inspector
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Apply To: A pop-up menu that sets how your paint stroke is affected by pen speed. There are
five options:
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Width: The quicker you move the pen, the more narrow the stroke; the slower you move the
pen, the wider the stroke.
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Opacity: Pen speed affects the opacity of the stroke. The faster you move the pen, the less
opaque the stroke.
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Spacing: The faster you move the pen, the greater the spacing between stroke dabs.
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Angle: The faster the movement of the pen, the greater the angle of the stroke dabs.
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Jitter: The faster the movement of the pen, the larger the amount of jitter on the stroke. Jitter
randomizes the position of the paint dabs so they appear more like particles.
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Min Speed: A slider that adjusts the minimum threshold of speed sensitivity. Speed values
below the minimum value are remapped to 0. For Opacity and Width, those values do not
appear. For Spacing, Angle, and Jitter, the values are not modified. If the Min and Max speeds
are plotted on a graph, Min Speed represents the minimum value, or 0. The area of the graph
between Min and Max is remapped to the output values.
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Max Speed: A slider that adjusts the maximum threshold of speed sensitivity. Speed values
above the maximum value are remapped to 1. For Opacity, Width, Spacing, Angle, and Jitter,
those values will have the greatest effect. If the Min and Max speeds are plotted on a graph,
Max Speed represents the maximum value, or 1. The area of the graph between Min and Max
is remapped to the output values.
•
Scale: A slider that determines the magnitude of the effect. The Scale slider 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 adjacent value slider). 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.
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