Apple Motion 5.1.1 - Manual (Page 528)

Chapter 14 Particles 528
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Line: Particles emerge from a line. Using the onscreen controls (with the Adjust Item tool) or
the Properties Inspector, you can specify the length and location of the line. In the Inspector,
you can set a specific number of points where particles emerge. This emitter shape is good
for creating sheets of particles that cascade over a wide area. The Line shape displays
additional parameters.
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Rectangle: Particles emerge from a rectangle along its edge, or in a tile-fill or random-fill
pattern. Using the onscreen controls (with the Adjust Item tool), you can specify the size and
location of the rectangle. Drag the corners to adjust width and height; drag edges to adjust
width or height independently. Depending on the selected Arrangement, the Rectangle
emitter shape displays additional parameters. In the following image, the Emitter shape
Arrangement parameter is set to Outline.
Use the following modifier keys to more precisely manipulate the corners of the Rectangle
onscreen controls (with the Adjust Item tool):
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Option: Adjustments to size are scaled uniformly, with the anchor point remaining fixed.
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Shift: Adjustments to size are made proportionally.
67% resize factor