8

Operand 1079
Oper an d
An o perand is one of a set of objects upon which
an operation such as
Boolean (page 1–333) is to be
done. The Boolean operation takes two operands:
the first op er and is c a l led operand A, and the
secondoperandiscalledoperandB.
Oper ator
In Particle Flow (page 2–105) ,theoperatoristhe
basicelementoftheparticlesystem;youcombine
operators into
events (page 3–1029) to specify the
particles’ characteristics over a given per iod of
time. Operators let you describe particle speed and
direction, shape, surface properties, and more.
AlistofalloperatorsinParticleFlowisavailablein
the
Operators topic (page 2–138) .
See also
Test (page 3–1115)
Oper ator I con
In Particle Flow (page 2–105) ,addinga Find Target
test (page 2–214)
or a Speed By Icon operator
(page 2–158)
to a particle system creates a special
viewport icon used by the action. This icon is
known as an operator icon. In the 3ds Max scene,
an operator icon functions as a Helper object, and,
in fact, you can also add these two actions from the
Create panel by choosing Helpers > Particle Flow.
Find Target icon (top ); Speed By I con icon (bottom)
Optical M a rker s
Reflective markers used by certain motion-capture
equipment. In a motion-capture session, markers
are reflective objects placed on the “actor” or
“talent.” The markers enable motion-capture
hardware to record the position of various parts of
the talent’s body while performing motions.
Or ient ati on Beha vi or
In crowd animation (page 2–1006) ,the
Orientation behavior lets you control whether
and how delegates rotate, independent of their
direction of motion. Normally, a delegate always
faces in the direction it’s moving. You can use
the Orientation behavior to specify limits to the
delegate ’s rotational activity without affecting its
path, which is generated by other behaviors. Use
these settings, for example, to keep delegates facing
in one direction while moving in another.