Apple Motion 5.1.1 - Manual (Page 537)

Chapter 14 Particles 537
Cell parameters in the Inspector
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Birth Rate: A slider that defines the birth rate of the cell. In other words, this parameter defines
how many particles of this cell emerge from the emitter every second. Higher values create
denser particle effects.
Low birth rate particle system High birth rate particle system
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Birth Rate Randomness: A slider that defines an amount of variance in the Birth Rate of
generated particles. A value of 0 results in no variance—particles emerge from the emitter
at the same rate. A value greater than 0 introduces a variance defined by the Birth Rate
parameter, plus or minus a random value falling within the Birth Rate Randomness setting.
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Initial Number: A slider that defines the initial number of particles. This parameter determines
how many particles of this cell appear at the first frame of a particle effect. The result is an
initial burst of particles that eventually evens out according to the Birth Rate parameter.
Initial Number set to 5 (frame 3) Initial Number set to 20 (frame 3)
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Life: A slider that defines the duration of every particle, in seconds. This parameter specifies
how long each particle lasts before vanishing from existence. This effect is similar to how
sparks disappear after flying away from a sparkler. Unless the Color Over Life parameter or
Opacity Over Life parameter is used to fade each particle out over its life, particles immediately
vanish at the end of their lifetimes.
Life set to 5 (frame 60) Life set to 2 (frame 60)
67% resize factor