2009

Particle movement is always in a straight line unless influenced by other
factors.
Along Icon Arrow Particles move parallel to the icon arrow. Rotate the icon
to change the direction.
Icon Center Out Each particle moves along an imaginary line drawn between
the particle's location and the icon center.
With the flat icon types (Rectangle and Circle), this results in all the particles
moving in one plane, unless you increase Divergence above 0.0. With icons
that have height (Box and Sphere), the particles move outward in three
dimensions.
Particles at the center, as is the case when the Position operator's Location
parameter is set to Pivot, arbitrarily move along the world X axis.
Icon Arrow Out Each particle moves along an imaginary line drawn between
the particle's location and the icon arrow. The line is perpendicular to the
icon arrow, which is considered an infinite line for this purpose.
With the flat icon types (Rectangle and Circle), this results in all the particles
moving in one plane, unless you increase Divergence above 0.0. With icons
that have height (Box and Sphere), the particles move outward in a cylindrical
formation.
Random 3D Particles move in all directions. This option is affected by the
Uniqueness setting.
Random Horizontal Each particle moves in a random horizontal direction;
that is, parallel to the world XY plane. This option is affected by the
Uniqueness setting.
Inherit Previous Uses the current direction of motion.
If you choose Inherit Previous but no direction was previously specified, the
speed and direction are undefined; the particles don't move.
Reverse When on, the direction is reversed. Default=off.
Using Reverse is the equivalent of multiplying the Speed value by -1. This
option is unavailable if Random 3D or Random Horizontal is chosen.
Divergence When on, spreads out the particle stream. Use the numeric setting
to define the extent of the divergence, in degrees. Range=0 to 180. Default=0.
The value can be animated.
This option is unavailable if Random 3D is chosen.
Particle Flow | 2875