Apple Motion 4 - Manual (Page 630)

• Line: Particles emerge from a line. Using the onscreen controls (with the Adjust Item
tool) or the Properties tab of the Inspector, you can specify the length and location of
the line. In the Inspector, you can set a specific number of points from which particles
emerge. This emitter shape is good for creating sheets of particles that cascade over a
wide area. The Line shape displays additional parameters.
• Rectangle: Particles emerge from a rectangle along its edge, or in a tile 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):
• Option: Adjustments to size are scaled uniformly, with the anchor point remaining
fixed.
• Shift: Adjustments to size are made proportionally.
630 Chapter 11 Working with Particles