Apple Motion 4 - Manual (Page 647)

Hold Frames: This parameter appears if the particle system was created from a QuickTime
movie. Adjust the slider to change 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 Randomness: This parameter appears if the particle system was created
from a QuickTime movie. Varies the number of frames to “hold.”
Show Particles As: Use this pop-up menu to view particles in a variety of preview modes,
or as they actually appear. These nonimage modes play more efficiently when viewing
a complex particle system and also provide other ways of analyzing particle motion. By
default, this parameter is set to Image, which displays each particle as it is supposed to
appear. There are four options from which to choose:
• Points: Each particle is represented by a single point. This is the fastest preview mode
and is useful for displaying the type and speed of particle motion in a system. When
selected, the Point Size parameter is revealed.
• Lines: Each particle is represented by a line. This is a good preview mode to use to
analyze the vector of each particle’s motion. The length of each line is determined by
that particle’s speed, and the angle of each line equals each particle’s direction.
647 Chapter 11 Working with Particles