5.5

Table Of Contents
825Motion User Guide
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.
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.
Advanced pane controls in Motion
The Advanced pane becomes available when the Brush Type pop-up menu in the Shape
Inspectors Style pane is set to Airbrush or Image. The Advanced pane contains Dynamics
controls that animate the dabs of a paint stroke like particles. Unlike particles, dabs are
only “born” one time; but they can age and die like particles. When the Dynamics checkbox
is deselected, dabs are immortal and are not animated.
Note: Although the Dynamics parameters are animated by default, you can customize the
animation by keyframing or applying Parameter behaviors to the Dynamics parameters in
the Advanced pane.
In addition to the Dynamics controls, the Advanced pane also contains controls for
adjusting pen pressure and speed.
Dynamics controls
Select the activation checkbox and adjust this group of parameters to animate paint stroke
dabs in particle-like fashion. Double-click the Dynamics heading to reveal the Dynamics
controls:
Emission Angle: A dial and value slider that set the direction in which the paint dabs
travel. This parameter works in conjunction with the Emission Range parameter
(described below).
Emission Range: A dial and value slider that restrict the area in which the dabs travel, in
the direction of the Emission Angle. Setting the Emission Range parameter to 0 degrees
keeps dabs perpendicular to the paint stroke.
Life: A slider that defines the duration of each dab, in seconds, controlling how long
each dab lasts before disappearing—similar to how sparks disappear after flying away
from a sparkler.