Apple Motion 5.1.1 - Manual (Page 867)

Chapter 20 Shapes, masks, and paint strokes 867
5 To add width keyframes, Option-click or double-click the red spline.
6 To delete width keyframes, select the keyframe and press Delete.
Advanced pane
The Advanced pane of the Shape Inspector 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. Dynamic dabs share several controls with particles, such as Emission Angle,
Life, Speed, and Spin. When the Dynamics checkbox is deselected, dabs are immortal and are
not animated. The Advanced pane is not available until the Brush Type pop-up menu in the Style
pane is set to Airbrush or Image.
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 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 like particles. Click the Show button on the right side of the Dynamics row to reveal the
Dynamics controls:
Note: When a Simulation behavior is applied to a paint stroke, the Affect Subobjects parameter
appears in the behavior only when the Dynamics checkbox is selected for the paint stroke.
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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.
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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.
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Life: A slider that defines the duration of each dab, in seconds. This specifies how long each
dab lasts before disappearing—similar to how sparks disappear after flying away from
a sparkler.
•
Life Randomness: A slider and adjacent value slider that define an amount of variance in the life
of the paint dabs. A value of 0 results in no variance—all dabs from the selected stroke share
the same life span. A value greater than 0 introduces a variance defined by the Life parameter,
plus or minus a random value falling within the Life Randomness value.
•
Speed: A slider that defines initial speed, determining how quickly each dab flies away from
the stroke.
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Speed Randomness: A slider that defines an amount of variance in the speed of the paint dabs.
A value of 0 results in no variance—all dabs from the selected stroke move with the same
speed. A value greater than 0 introduces a variance defined by the Speed parameter, plus or
minus a predetermined random value falling within the Speed Randomness value.
•
Spin: A dial that animates the dabs of a paint stroke by initially spinning each dab around its
center. Adjustments to this control are in degrees per second.
•
Spin Randomness: A dial that defines an amount of variance in the spin of the paint dabs. A
value of 0 results in no variance—all dabs from the selected stroke spin at the same rate. A
value greater than 0 introduces a variance defined by the Spin parameter, plus or minus a
random value falling within the Spin Randomness value.
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