8

Rotation Operator 149
Total—
Sets the number of emission points.
Available only when Distinct Points Only is on.
Default=10.
If Location Is Invalid group
Delete Par ticles—When on, if the software cannot
place a particle according to the current option, it
deletes the particle. When off, particle placement
is undefined; that is, it depends on other variables.
Default=off.
If the number of particles is more import ant than
thepositionontheobject,leavethisoff.However,
if exact placement is of higher priority than the
number of particles, turn Delete Particles on.
Uniqueness group
The Uniqueness sett ing enables randomization of
placement on the emitters.
Seed—Specifies a randomization value.
New—Calculates a new seed using a r andomization
formula.
Attempts M ax—When using the Separation option,
this specifies the maximu m number of times
Particle Flow will tr y to set particle positions that
maintain the requested distance. If unsuccessful
within this number of attempts, particles might be
closer together than the requested distance. Also
affects placement with Density By Material using
either of the Gr ayscale opt ions.
Rotation Operator
Particle View (page 2–121) > Click a Rotation op erator
in an event or add a Rotation operator to the particle
system and then select it.
The Rotation operator lets you set and animate
particle orientation during an event, with optional
random variation. You can apply orientation in
any of five different matr ices: two random and
three explicit. For some options you can set a
degree of random variation or divergence from the
specified orientation.
To c a u s e p a r t i c l e s to sp i n , u s e t h e
Spin operator
(page 2–150)
.
Interfa ce
The user interface appears in the parameters panel,
on the right side of the P article View dialog.
Orientation Matrix group
The Orientation Matrix setting includes options
that give particles random orientations, or let you
specify orientation in any of three different ways.
Default=Random 3D.
Random 3D—Gives each part icle an a rbitrary,
random 3D orientation.
Random Horizontal—Gives each particle an
arbitrary, random 3D orientation about the Z axis
only. Rotation about the X and Y axes doesn’t
change (unless Divergence is used), so the particles
remain vertical.
Worl d S p ace—Orientation is specified in the world
coordinate space.
Use the X/Y/Z settings to specify the or ientation
for all particles.