9

Operand 985
Oper an d
An operand is one of a set of objects upon which
an operation such as B oolean (page 1–338) is to be
done. The Boolean operation tak es two operands:
the first operand is called operand A, and the
secondoperandiscalledoperandB.
Oper ator
In Particle Flow (page 2–109),theoperatoristhe
basicelementoftheparticlesystem;youcombine
operators into events (page 3–935) to specify the
particles’ characteristics over a g iven period of
time. Operators let you describe part icle speed and
direction, shape, surface properties, and more.
AlistofalloperatorsinParticleFlowisavailablein
the Operators topic (page 2–142).
See also
Test (page 3–1021)
Oper ator Icon
In Particle Flow (page 2–109),addingaFind Target
test (page 2–218) or a Speed By Icon operator
(page 2–162) 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); Spee d By Icon icon (bottom)
Optical M ar ker 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 B ehav ior
In crowd animation (page 2–1154), the Orientation
behavior lets you control whether and how
delegates rotate, independent of t heir 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 sett ings, for example, to keep delegates facing
in one direction while mo ving in another.