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272 Chapter 11: Space Warps and Particle Systems
depending on Particle Bounce settings in the
deflector, and on death they disappear.
Die After Collision—Particles disappear when they
str ike a deflec tor to w h ich they’re bound, such as
the SDeflector.
Pers is t—The life, in fr ames, that the par ticle will
persist after the collision. Setting this to 0 (the
default) causes particles to vanish immediately
after the collision.
Variation—Varies the Persist value of each particle,
when Persist is greater than 0. This lets you
"feather" the dying off of particle density.
Spawn on Collision—Spawn effects take place upon
collision with a bound deflector.
SpawnonDeath—Spawn effects take place at the
end of each particle’s life.
Spawn Trails—Particles are spawned from existing
part icles at each f rame of that particle’s life.
The Multiplier spinner specifies the number of
particles that are spawned from each particle. The
base direction of the spawned particles is opposite
that of the parent’s velocity. The Scale, Direction,
and Speed Chaos factors are applied to that base
direction.
Note: If the Multiplier is greater than 1, at least one
of the three Chaos factors must be greater than 0
in order to see the additional spawned particles.
Other wise, the multiples will occupy the same
space.
Wa rning: This option can produce many part icles. For
best results, begin by setting Particle Qu antity on the
Particle Generation rollout to Use Rate and to 1.
Spawns—
The number of spawns beyond the
original particle generation. For example, if this
is set to 1, and you’re spawning at death, one
spa wning will occur beyond the original lifespan
of each particle.
Affects—Specifies the percentage of particles that
will spawn. Reducing this reduces the number of
particles tha t produce spawned particles.
Multiplier—Multiplies the number of particles
spawned at each spawning event.
Variation—Specifies a percentage r ange by which
the Multiplier value will vary, fr ame by f rame.
Direction Chaos group
Chaos —Specifies the amount by wh ich the
direction of the spawned p article can v ary from
the direction of the p arent particle. A setting
of 0 means no variance. A setting of 100 causes
the spaw ned p article to travel in any random
direction. A sett ing of 50 causes the spaw ned
particle to deviate from its parent’s path by up to
90 deg rees.
Speed Chaos group
These options let you vary the spawned particles’
speed randomly in relation to their parents’ speed.
Factor—This is the range of a percentage of change
in the speed of the spawned particle relative to its
parent. A value of 0 means no change.
Slow—Applies the speed factor randomly to slow
the speed of the spawned p articles.
Fast—Randomly speeds up particles based on the
speed factor.
Both—Some particles speed up, while others slow
dow n, based on the speed factor.
Inherit Parent Velocity —Spawned particles inherit
the speed of their parents, in addition to the effect
of the speed factor.
Use Fixed Value—Uses the Factor value as a set
value, rather than as a range applied randomly to
each particle.