Apple Motion 5.1.1 - Manual (Page 866)

Chapter 20 Shapes, masks, and paint strokes 866
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Stroke Length: A slider that determines where along the range of the dabs within the stroke
the Jitter Over Stroke value (for the selected keyframe) is applied.
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Random Seed: Controls that vary the Jitter, Brush Angle Randomness, and Brush Scale
Randomness parameters (in the Stroke pane) and the Life, Speed, and Spin Randomness
parameters (in the Advanced pane). If you don’t like the current random distribution of the
dabs, you can change the seed number by typing a new number in the value field or clicking
Generate. The Jitter value must be 1 or more for this parameter to have any effect.
Use the Width Over Stroke onscreen controls
Typically the Width Over Stroke control is set in the Stroke pane of the Shape Inspector (which
is only available when the Brush Type for the Outline of the selected shape is set to Airbrush).
However, you can also adjust Width Over Stroke keyframe values in the Canvas by dragging an
editable control that appears at each keyframe in the stroke.
Use the onscreen Width Over Stroke controls
1 In the Canvas, Control-click the paint stroke, then choose Stroke from the shortcut menu.
Small control points (+) appear at each keyframe along the red spline.
2 Click the control point that represents the keyframe you want to adjust.
Control handles appear on either side of the control point.
3 To increase the width of the dabs, drag away from the point; to decrease the width of the dabs,
drag toward the point.
4 To change the position of a width keyframe, drag the control point left or right to move it along
the length of the stroke. (Keyframes can be dragged over one another.)
The mini-curve editor is updated as you make your onscreen adjustments.
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