Apple Motion 4 - Manual (Page 1121)

Brush Angle: Specifies (in degrees) the rotation of the stroke dabs. Using the default dial
or value slider modifies the Z angle. When the Local 3D checkbox is selected, additional
Brush Angle Randomness controls become available. Click the disclosure triangle to
expose X, Y, and Z rotation dials and the Animate pop-up menu.
• Animate: Available when the Local 3D checkbox is selected, this pop-up menu allows
you to change the interpolation for animated 3D rotation channels. Click the Brush
Angle disclosure triangle to display the Animate parameter. By default, Animate is set
to Use Rotation.
• Use Rotation: The default interpolation method. Pattern elements rotate from their
start rotation to their final rotation. Depending on the animation, the elements may
twist this way and that before reaching their final orientation (the last keyframed
value). For example, if the X, Y, and Z angle parameters are animated from 0 degrees
to 180 degrees in a project, the elements rotate on all axes before reaching their final
orientation.
• Use Orientation: This alternate interpolation method provides for smoother
interpolation but does not allow multiple revolutions. It interpolates between the
pattern elements’ start orientation (first keyframe) to their end orientation (second
keyframe).
Angle Over Stroke: This mini-curve editor allows you to customize the Z rotation (in
degrees) of the dabs over the length of the stroke. You can create a curve that gradually
increases the dabs’ angle over the length of the stroke, a curve that varies the dabs’ angle
over the length of the stroke, and so on. Select or add a keyframe in the graph to make
changes using the Angle Over Stroke and Stroke Length controls.
• Angle Over Stroke: Use the dial or value slider to change the value of the selected
keyframe.
• Stroke Length: Stroke Length is mapped horizontally on the mini-curve editor graph
and provides a visual representation of the position of the changes in angle value
(keyframes) over the length of the stroke. Use the sliders or enter a number in the value
field to change the value of the selected keyframe.
Brush Angle Randomness: Defines an amount of variance in the rotation of the stroke
dabs. A value of 0 results in no variance—all dabs have the same rotational value. A value
greater than 0 introduces a variance. The angle for an individual dab is defined by the
Brush Angle and Angle Over Stroke parameters, plus or minus a random value falling
within the Brush Angle Randomness.
1121 Chapter 17 Using Shapes, Masks, and Paint Strokes