2009

Control By Speed group
Use these settings to specify speed and acceleration parameters when using
Control By Speed or Speed Then Time. This group is available only when using
Control By Speed.
Use Cruise Speed When on, the software gives you explicit control over
particle speed and speed variation. When off, the software calculates particle
speed automatically using the Accel Limit value. Default=on.
Speed Particle speed in scene units per second. Default=300.0.
Variation The amount by which the actual Speed value can vary randomly.
Default=0.0.
To obtain the actual speed for each particle, the system multiplies the Variation
value by a random number between -1.0 and 1.0, and then applies the result
as a percentage of the Speed setting. For example, if Speed=200 and
Variation=10, then the actual speed for each particle would vary randomly
between 190 and 210.
Accel Limit Sets the acceleration limit. This value impacts the inertia and
speed of the particles. Default=1000.0.
The default acceleration limit value is based on the default Speed value of
300.0. If you change the Speed value, it is recommended that you also change
the Accel Limit value proportionately.
TIP Use a lower Accel Limit value for smooth motion, and a higher value when
greater accuracy is needed, such as when the particles should hit a small target.
You can animate this setting (use Sync By > Event Duration) to specify different
appropriate values, depending on the required results.
Ease In % Controls the rate by which particles slow down when it approaches
the target point.
The software calculates the final speed with this formula: (100% - Ease In) *
Speed. Therefore, if the Ease In value is 100%, a particle should approach the
target with a speed of 0, and if Ease In is 0%, the particle doesn't slow down
at all when approaching the target. At intermediate values, the speed is
calculated according to the distance to the target point, as linear interpolation
between the initial (cruise) speed, and the final speed. When a particle enters
the event, the distance to the target point is calculated and later used for the
interpolation. Default=0.0.
Particle Flow | 2975