2009

#=20 and Variation=10, then the actual number of offspring for each particle
would be between 18 and 22.
Sync By Choose the time frame to use when animating Rate, Step Size,
Offspring #, and Variation:
■ 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.
Restart Particle Age When on, sets the age of each newly spawned particle
at 0. When off, each spawned particle inherits its parent's age. Default=on.
Speed group
Lets you specify the speed of spawned particles in absolute terms or relative
to the parents' speed, with optional random variation. The direction of a
spawned particle is always in relation to that of its parent, but you can set a
Divergence so they eventually spread out. Default=Inherited.
In Units Choose this to specify the speed of spawned particles in system units
per second. Default=100.0.
A positive value inherits the parent's direction; a negative value reverses it.
Inherited Choose this to specify each spawned particle's speed as a percentage
of its parent's speed. Default=100.0
A positive value inherits the parent's direction; a negative value reverses it.
Variation The amount by which a spawned particle's speed can vary randomly.
Default=0.0.
To obtain the actual speed for each spawned particle, the system multiplies
the Variation value by a random number between -1.0 and 1.0, and then adds
the result to the particle's speed as specified or inherited. For example, if a
particle's speed is 100 units/second and Variation=20, then the tested value
for each particle would be between 80 and 120 units/second.
Divergence When on, spreads out the stream of spawned particles. Use the
numeric setting to define the extent of the divergence in degrees. Range=0 to
180. Default=0.
2994 | Chapter 14 Space Warps and Particle Systems