Apple Motion 5.1.1 - Manual (Page 541)

Chapter 14 Particles 541
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Attach To Emitter: A slider that determines how closely particles follow the position of a
moving emitter. If set to zero, particles follow their own path after being emitted, resulting in
particles that trail along the motion path the emitter is following. If this parameter is set to
100, in the absence of other behaviors, all generated particles follow the emitter, surrounding
it in a moving cloud of particles.
Attach to Emitter set to 0 (zero) Attach to Emitter set to 100
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Play Frames: This checkbox, which appears if the particle system was created from a QuickTime
movie, controls playback. If selected, playback of the animation or movie clip used to generate
each particle loops. If deselected, particles are generated using the still frame specified by the
Random Start Frame parameter or the Source Start Frame parameter.
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Random Start Frame: This checkbox, which appears if the particle system was created from
a QuickTime movie, introduces variation into animated particles generated from QuickTime
objects. If selected, each newly generated particle begins at a different frame of the animation.
Stills are chosen randomly if Play Frames is deselected.
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Source Start Frame: This slider is available if the particle system was created from a QuickTime
movie, and Random Start Frame is deselected. Use it to set the start frame of the animation (if
the Play Frames checkbox is selected) or the still frame to display (if the Play Frames checkbox
is deselected).
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Hold Frames: This slider, available if the particle system was created from a QuickTime movie,
sets the number of times each frame of the source movie is repeated during playback. The
larger the Hold Frames value, the slower your playback.
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Hold Frames Randomness: This slider, available if the particle system was created from a
QuickTime movie, varies the number of frames to “hold.”
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