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Gravity Space Warp 69
Along Offset Splines—
Thedistancebetweenthe
particle system and t he path alter the effect of the
particlemotion.Ifthefirstvertexofthesplineisat
the birthplace of the particle, the particle follows
thesplinepath.Ifyoumovethepathawayfrom
theparticlesystem,theparticlesareaffectedby
the offset.
Along Parallel S plines—Particles follow a copy of
the selected path, parallel to the particle system. In
this mode, the position of the path relative to the
particle system does not matter. The orientation of
the path, however, affects the part icle stream.
Constant Speed—When on, all particles travel at
thesamespeed.
Stream Taper—Causes particles to converge
or diverge toward the path over time, or to
simultaneously converge and diverge. You specify
the effect by choosing Converge, Diverge, or Both
(see follow ing). This prov ides a tapering effect
over the length of the path.
Variation—The amount by which Stream Taper
can vary for each particle.
Co nverge—When Stream Taper is greater than
0,theparticlesmoveintowardthepathasthey
followthepath.Theeffectisthatthestreamtapers
from larger to smaller over time.
Diverge—Provides the opposite effec t of Converge.
The particles diverge from the path over time.
Both—Splits the particle stream, causing some
particles to converge and others to diverge.
Stream Swirl—Specifies the number of turns
by which par ticles spiral about the path. In
conjunction with Stream Taper, alters the diameter
of the spiral.
Stream S wirl is generally more effective when you
choose Along Offset Splines.
Variation—The amount by which each particle can
vary from the Spiral value.
Clo ckw is e —Particles spiral in a clockwise
direction.
Counterclockw ise — Particles spiral in a
counterclockwise direction.
Bidirectional—The st ream is split so that part icles
spiral in both directions.
Uniqueness group
Provides a seed number for unique generation of
theparticlepattern.
Seed—Specifies the seed nu mber for the current
Path Follow .
Display Icon group
Affects the display of the Path Follow icon.
Icon S ize—Specifies the size o f the Path Follow
icon. Does not alter the Path Follow effect.
Grav ity Space Warp
Create panel > Space Warps > Forces > Object Type
rollout > Gravity
Create menu > Space Warps > Forces > Gravity
Particles falling because of gravity
The Gravity space warp simulates the effect of
natural gravity on par ticles generated by a particle
system. Gravity i s directional. Particles moving
in the direction of the gravity arrow accelerate.
Particles moving against the arrow decelerate. In
the case of spherical gravity, motion is toward
the icon. Grav ity can also be used as an effect in
dynamics simulations. See
Dynamics Ut ility (page
2–663)
.