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Force The amount of force applied to the particles. Use positive values to
separate particles, or negative values to move them closer together.
Default=100.0
Accel(eration) Limit When on, lets you set a maximum acceleration value
that can be applied to particles' motion. When off, the software uses any
necessary acceleration. Default=on, 1000.0.
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.
Speed Limit When on, lets you set a maximum speed value that can be applied
to particles' motion. When off, the software uses any necessary speed.
Default=off, 600.0.
Range group
You can set a volume and falloff within which the force takes effect, either as
absolute distances or relative to particle size. Default=Absolute Size.
Absolute Size Choose this to set the core radius and falloff zone as absolute
distances, in system units.
Core Radius The distance from each particle's pivot point, in system units,
within which the force is applied at full strength. Default=10.0
Falloff Zone The distance beyond the core radius, in system units, over which
the force diminishes from full strength to 0. Default=10.0
Relative to Particle Size Choose this to set the core radius and falloff zone
as percentages, relative to the radius of each particle. The particle radius is
determined by measuring the distance from the pivot point to the farthest
corner of its bounding box.
Core % The distance from each particle, as a percentage of the particle radius,
within which the force is applied at full strength. Default=200.0
Falloff % The distance beyond the core radius, as a percentage of the radius,
over which the force diminishes from full strength to 0. Default=100.0
Variation % The amount by which range values can vary randomly, as a
percentage of the specified values. The software uses the same random variation
value for both Core and Falloff values, whether absolute or relative. Default=0.0
For example, if you choose Absolute Size, set Core Radius to 40 and Falloff
Zone to 20, and set Variation % to 50, then each particle's actual core radius
2898 | Chapter 14 Space Warps and Particle Systems