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Timing group
Time On/Time Off The frame numbers at which the space warp becomes
active and becomes inactive.
Damping Characteristics group
This group lets you choose Linear Damping, Spherical Damping, or Cylindrical
Damping, plus a set of parameters for each.
Unlimited Range When on, Drag exerts full damping strength over an
unlimited range. When off, the Range and Falloff settings for the current
damping type take effect.
■ Linear Damping Motion for each particle is separated into vectors for
the space warp's local X, Y, and Z axes. The area over which damping is
exerted for each vector is an infinite plane whose thickness is determined
by the corresponding Range setting.
X Axis/Y Axis/Z Axis
Specifies the percentage of particle motion along the local Drag space warp
axis that's affected by the damping.
Range
Sets the thickness of the "range plane," or the infinite plane perpendicular
to the specified axis. Takes effect only when Unlimited Range is turned
off.
Falloff
Specifies the distance beyond the X, Y, or Z Range within which Linear
Damping is applied. Damping is strongest at the Range distance, decreases
linearly out to the limit of the Falloff, and has no effect beyond that. While
Falloff takes effect only beyond the Range, it is measured from the center
of the icon, and always has a minimum value equal to the Range value.
Takes effect only when Unlimited Range is turned off.
■ Spherical Damping When Drag operates in Spherical Damping mode,
its icon is a sphere within a sphere. Particle motion is broken up into radial
and tangential vectors. Damping is applied for each vector within a
spherical volume whose radius is set by the Range setting, when Unlimited
Range is off.
Radial/Tangential
Radial specifies the percentage of particle motion toward or away from the
center of the Drag icon that's affected by the damping. Tangential specifies
the percentage of particle motion across the body of the Drag icon that's
affected by the damping.
2710 | Chapter 14 Space Warps and Particle Systems