Apple Motion 5.1.1 - Manual (Page 868)

Chapter 20 Shapes, masks, and paint strokes 868
Pen Pressure and Pen Speed controls
The Pen Pressure controls let you adjust 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 Pen
Speed controls let you adjust the width, opacity, spacing, angle, or jitter of the paint stroke based
on the speed of your stylus on the tablet when the stroke was created. These controls appear
when you create a paint stroke using the Paint Stroke tool in the toolbar or apply a shape style
from the Shape Style pop-up menu to an existing paint stroke.
Note: Only strokes drawn using a stylus and tablet will have recorded pressure variations. You
can select how the pressure of the stylus affects the stroke in the Paint Tool HUD before the
stroke is created or afterwards by activating this parameter in the Advanced pane.
These controls are identical to the Apply Pen Pressure (Shape behavior) and Apply Pen Speed
(Shape behavior) parameters. For more information, see
Shape behaviors overview on page 871.
The inspector parameters can be used in combination with these shape behaviors to affect more
than one parameter (such as Opacity, Width, or Jitter) of the stroke using the same pressure and
speed data.
Geometry pane
The Geometry pane of the Shape Inspector contains controls that allow you to change the shape
type, to close or open a shape, and to individually adjust the position of a shape’s control points
using value sliders. The Geometry pane controls are available for all shapes regardless of what
is selected in the Brush Type pop-up menu in the Style pane. You can change a shape’s type at
any time. Changing a shape’s type changes its form. For example, a single set of control points
produces the following three shapes, depending on the selected Shape Type.
Linear shape B-Spline shape Bezier shape
Geometry controls
•
Shape Type: A pop-up menu that sets the type of control points used to define the shape. For
example, if you originally created a Bezier shape, you can choose B-Spline from this menu to
change each Bezier control point into a B-Spline control point. Changing the shape type does
not move the control points, although the shape is changed, sometimes dramatically. There
are three options:
•
Linear: All control points are joined by hard angles, and the resulting shape is a polygon. The
control points of a Linear shape lie directly on its edges.
•
Bezier: Control points can be a mix of Bezier curves and hard angles, creating any sort of
shape. The control points of a Bezier shape lie directly on its edge.
•
B-Spline: Control points are all B-Spline points, with different degrees of curvature. B-Spline
control points lie inside, outside, or on the edge of the shape, and are connected by the
B-Spline frame.
Note: To show or hide the display of the B-Spline frame, choose View > Overlays > Lines.
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