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268 Chapter 11: Space Warps and Particle Systems
depending on Particle Bounce settings in the
deflector, and on death they disappear.
Die Af ter Collision—Particles disappear when they
str ike a deflector to which they’re bound, such as
the SDeflector.
Pers is t—The life, in fr ames, that the particle will
persist after the collision. Se tting this to 0 (the
default) c auses 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 par ticle 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 frame 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 rn in g : This option can produce many particles. For
best results, begin by setting Particle Quantity 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
spawning 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 that produce spawned particles.
Multiplier—Multiplies the number of particles
spawned at each spawning event.
Variation—Specifies a percentage range by which
the Multiplier value will vary, frame by frame.
Direction Chaos group
Chao s —Specifies the amount by which the
direction of the spawned particle can vary f rom
the direction of the parent particle. A setting
of 0 m eans no vari ance. A setting of 100 causes
the spawned par t icle to travel in any random
direction. A setting of 50 causes the spawned
particle to deviate from its parent’s path by up to
90 degrees.
Speed Chaos group
These options let you vary the spawned par ticles’
speed r andomly in relation to their parents’ speed.
Factor—This is the range of a percentage of change
in the speed of the spawned particle relat ive to its
parent. A value of 0 means no change.
Slow—Applies the speed factor randomly to slow
the speed of the spawned part icles.
Fast—Randomly speeds up particles based on the
speed factor.
Both—Some particles speed up, while others slow
dow n, based on the speed fac tor.
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.