2009

Falloff Zone The distance, in system units, beyond the Range value within
which the Surface Geometry exerts partial control over particles. The degree
of control diminishes from 100% at the Range distance to 0% at the
Range+Falloff Zone distance.
Animation Offset Keying group
Choose the time frame for applying animated parameters. For an explanation,
see
Animation Offset Keying group on page 2870.
Absolute Time Any keys set for parameters are applied at the actual frames
for which they're set.
Particle Age Any keys set for parameters are applied at the corresponding
frames of each particle's existence.
Event Duration Any keys set for parameters are applied to each particle starting
when it first enters the event.
Uniqueness group
The Uniqueness setting enables randomization of speed variation, and
randomization of direction with the Random 3D and Random Horizontal
options.
Seed Specifies a randomization value.
New Calculates a new seed using a randomization formula.
Keep Apart Operator
Particle View on page 2811 > Click Keep Apart in an event or add a Keep Apart
operator to the particle system and then select it.
The Keep Apart operator, a member of the Speed operator family, lets you
apply forces to particles to cause them to separate, in order to prevent or
minimize collisions among particles. Alternatively, you can use a negative
force to keep particles from separating too much. The operator works by
controlling particle speed and acceleration.
NOTE Keep Apart doesn't use particle geometry; rather, it creates a spherical force
field centered on the pivot of each particle. You can adjust the size of the force
field by changing the particle size.
2894 | Chapter 14 Space Warps and Particle Systems