5.5

817Motion User Guide
• Spacing: A slider (available when Brush Type is set to Airbrush or Image) that defines
the space between dabs. A lower number creates a more solid line, and a higher number
creates a greater distance between dabs.
• Additive Blend: A checkbox (available when Brush Type is set to Airbrush or Image) that
composites all overlapping dabs together using the Additive blend mode. By default,
dabs are composited together using the Normal blend mode. The Additive blend mode
occurs in addition to whichever compositing method is already in use (the Blend Mode
setting in the Properties Inspector).
• Reverse Stacking: A checkbox (available when Brush Type is set to Airbrush or Image)
that inverts the order in which the dabs are stacked. To see the effect of this parameter,
dabs must be overlapping.
• First Point Offset: A slider to offset and animate the start point of the outline. This is
very useful for effects such as drawing a line across a map over time.
• Last Point Offset: A slider to offset and animate the end point of the outline.
You can manually animate the First Point Offset and Last Point Offset parameters in the
Style pane of the Shape Inspector to achieve the same effect as the Write On behavior.
(You can also use the Shape Write On behaviors to draw a stroke or outline over time.
See Write On behavior in Motion.)
• Order: A pop-up menu that sets whether an outline is drawn over or under the fill color
or gradient. The effect is more apparent with thicker outline widths. There are two menu
options:
• Over Fill: Outlines appear on top of the selected fill of the shape.
• Under Fill: Outlines are obscured beneath the selected fill of the shape.
Style pane movie controls in Motion
Additional controls appear in the Shape Inspector’s Style pane when the Brush Source is a
multi-frame object such as a QuickTime movie or image sequence:
• Play Frames: A checkbox that controls playback of Brush Source movie or image
sequence. If the checkbox is selected, playback of the clip loops; if the checkbox is
deselected, the paint dabs use the still frame specified by the Random Start Frame
parameter or the Source Start Frame parameter (described below).
• Random Start Frame: A checkbox that introduces variation to image brush strokes
when the Brush Source parameter contains a multiframe movie or image sequence. If
the checkbox is selected, each dab uses a different random frame in the source clip. If
the Play Frames checkbox is selected, dabs begin animating from this random frame. If
the Play Frames checkbox is deselected, dabs do not animate, but display the random
frame as a still frame. You can adjust this pattern of randomness using the Random
Seed button in the Stroke pane.
• Source Start Frame: A mini-curve editor (available when Random Start Frame is
deselected) that defines the frame where playback of the source clip begins in the
paint dabs. (See Use the mini-curve editor in Motion.) The Source Start Frame default
keyframe value is 0. You can change the start frame for all dabs, or you can create a
curve so start frames vary over the length of the stroke (different dabs use different
start frames). For example, if the first Source Start Frame value is 50, each dab begins
playback at frame 50. If you create an animation curve that begins at 50 and ends at
250, each dab begins clip playback at a progressively later frame.