Apple Motion 3 - Manual (Page 720)

720 Chapter 8 Working with Particles
Box: This option is available when the 3D checkbox is turned on in the Emitter tab.
Particles are emitted from a three-dimensional cube along its surface (Outline), 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 front horizontal edge to
adjust height; drag the front vertical edge to adjust width; drag a back edge to adjust
depth; drag a front corner to simultaneously adjust the width and height. To reposition
the emitter, drag in the shape (but not on an edge or corner point). Depending on the
selected Arrangement, the Box shape displays additional parameters. In the following
image, the box’s Arrangement is set to Tile Fill.
Sphere: This option is available when the 3D checkbox is turned on in the Emitter tab.
Particles are emitted from a three-dimensional sphere along its surface (Outline) or in a
tile or random fill pattern. Using the onscreen controls (with the Adjust Item tool), you
can specify the radius and location of the circle. Drag the outline of the sphere to
adjust its radius; drag within the sphere to reposition it in the Canvas. When Sphere is
selected, the Arrangement parameter becomes available. Depending on the selected
Arrangement, the Sphere shape displays additional parameters.
Additional Emitter Parameters
The following parameters appear in the Emitter tab depending on the option chosen
from in the Shape pop-up menu. These parameters apply only to emitters and affect
the overall shape of particle systems by controlling the flow of particles.
Arrangement (Rectangle, Circle, Image, Box, Sphere): Specifies the pattern from which
the particles are generated. The arrangement options are:
 Outline: Emits particles along the edge of the shape in 2D emitters and along the
surface of the shape in 3D emitters.
 Tile Fill: Emits particles from a tiled pattern of rows, columns, and ranks (3D emitters)
within the circle, rectangle, image, box, or sphere. You can specify the number of
columns, rows, and ranks, as well as the Tile Offset.
 Random Fill: Emits particles randomly from within the circle, rectangle, image, box,
or sphere.