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146 Chapter 11: Space Warps and Particle Systems
Inter face
The user interface appears in the parameters panel,
ontherightsideoftheParticleViewdialog.
Lock On Emitter—Whenon,causesallparticlesto
remain at their initial positions on the emitter . In
effect, they’re “glued” to the emitter. When off,
each particle’s birth position is determined by the
emitter’s current location. Default=off.
Inher it E mit ter M ovement—When on, the software
sets each par ticle’s speed and direction of motion
to those of the emitter at the time of birth. When
off,theemittermovementdoesn’taffectthatofthe
part icles. Available only w hen Lock On Emitter
is off. Default=off.
Note: If a Speed operator exists later in the event, it
overrides any motion imparted by Inherit Emitter
Movement.
Multiplier—Determines, as a percentage, the extent
to which particles inherit the emitter’s motion.
Available only when Inherit Emitter Movement is
on. Default=100.
To have the particles move half as fast as the
emitter, set Multiplier to 50. To have them move
the same speed, use the defau lt setting of 100.
To make the particles move twice as fast as the
emitter, set Multiplier to 200.
Variation—Determines,asapercentage,theextent
to which inherited emitter motion can vary per
particle. To determine the final multiplier for
each particle, the Variation value is multiplied by
a random number between -1 .0 and 1.0, and then
added to the Multiplier value. Default=0.
Emitter Objects group
Use these controls to assign objects to be used as
particle emitters. The list in this group shows the
objects, or reference geometry, that the operator
uses as emitters.
If you don’t assign any objects, Particle Flow uses
the world origin (0,0,0) as the emitter source.
With more than one emitter object, the div ision
of particles among the objec ts depends on which
option you choose for Location. If you set Location
to Pivot, then each object has one emission point
andeachobjectemitsthesamenumberofparticles