Apple Motion 4 - Manual (Page 1137)

• Axis: When Axis is chosen from the Calculate Tilt pop-up menu, the Tilt Axis parameter
becomes available.
• Polar: Uses the tilt of the stylus as if it were an angle. When viewed from above, the
stylus points in a certain direction. That angle represents a polar value.
Tilt Axis: A dial and value slider that becomes available when Calculate Tilt is set to Axis.
This parameter allows you to define the axis along which the tilt is measured.
Min Tilt: Adjusts the minimum threshold of tilt sensitivity. Tilt values below the minimum
value are remapped to 0. For Opacity and Width, those remapped values do not appear.
For Spacing, Angle, and Jitter, the values will not be modified. If the Min and Max tilt are
plotted on a graph, Min Tilt represents the minimum value, or 0. The area of the graph
between Min and Max is remapped to the output values.
Max Tilt: Adjusts the maximum threshold of tilt sensitivity. Tilt 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 tilt are plotted on a graph, Max Tilt represents
the maximum value, or 1. The area of the graph between Min and Max is remapped to
the output values.
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) tilt, multiplied by
the value defined in the slider (or value field). 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.
Invert: This checkbox inverts the attributes of the stroke created by the behavior. For
example, if pen tilt 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.
Oscillate Shape
The Oscillate Shape behavior animates a shape by cycling its control points between two
different values. You can customize how wide apart the high and low values are, as well
as the number of oscillations per minute. This behavior is useful for creating fluid shape
movements (think shape yoga) that would be time-consuming to keyframe.
When the Oscillate Shape behavior is applied to a shape, all control points of the shape
are affected by default. When the behavior is selected in the Layers tab, affected control
points are highlighted in white on the blue shape behavior spline. To disable one or more
control points, click the control points. A disabled point appears blue. Drag to select
multiple control points.
1137 Chapter 17 Using Shapes, Masks, and Paint Strokes