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Chapter 41: Creating Particles and Particle Flow
the particle moves from side to side. Period is the time that it takes to complete one side-to-side motion
cycle. Phase defines where the particle starts along the amplitude curve.
Particle Spawn rollout
The Particle Spawn rollout, shown in Figure 41.13, sets options for spawning new particles when a particle
dies or collides with another particle. If the setting is None, colliding particles bounce off one another and
dying particles simply disappear. The Die After Collision option causes a particle to disappear after it col-
lides. The Persist value sets how long the particle stays around before disappearing. The Variation value
causes the Persist value to vary by a defined percentage.
FIGURE 41.13
The Particle Spawn rollout (shown in two parts) can cause particles to spawn new particles.

The Spawn on Collision, Spawn on Death, and Spawn Trails options all enable the spawn controls and define
when particles spawn new particles. The Spawns value is the number of times a particle can spawn other par-
ticles. The Affects value is the percentage of particles that can spawn new particles; lowering this value creates
some duds that do not spawn. The Multiplier value determines the number of new particles created.

Note
The Spawn Trails option causes every particle to spawn a new particle at every frame. This option can quickly cre-
ate an enormous number of particles and should be used with caution. n
The Chaos settings define the direction and speed of the spawned particles. A Direction Chaos value of 100
gives the spawned particles the freedom to travel in any direction, whereas a setting of 0 moves them in the
same direction as their originator.
The Chaos Speed Factor is the difference in speed between the spawned particle and its originator. This fac-
tor can be faster or slower than the original. Selecting the Both option speeds up some particles and slows
others randomly. You also can choose to have spawned particles use their parent’s velocity or use the factor
value as a fixed value.

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