Apple Motion 2 - Manual (Page 606)

606 Chapter 8 Working With Particles
Additional Cell Parameters for QuickTime Movies
If you create a particle system using a QuickTime object as a cell, additional parameters
appear. These four parameters are:
Animate Image: A checkbox that controls playback. If it’s turned on, it loops the
playback of the animation or movie clip used to generate each particle. If it’s turned off,
particles are generated using the still frame specified by either the Random Start Frame
parameter or the Source Start Frame parameter.
Random Start Frame: A checkbox that introduces variation into animated particles
generated from QuickTime objects. If it’s turned on, each newly generated particle
begins at a different frame of the animation. Stills are chosen randomly if Animate
Image is turned off.
Source Start Frame: Chooses the frame to begin animation, if Animate Image is turned
on, or the still frame to display if Play Frames is turned off. This parameter only appears
if Random Start Frame is turned off.
Hold Frames: The number of times each frame of the source movie is repeated during
playback. The larger the Hold Frames value, the slower your playback.
Hold Frames Range: Varies the number of frames to “hold.” See the Hold Frames
parameter description.
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