2009

Random Start Probability Set a percentage for random start probability. This
is used when multiple clips are selected as possible starting clips in a random
motion flow. The Create Random Motion command allows you to generate
random motion for one or more bipeds.
Working with Motion-Capture Data
Motion capture is the practice of getting motion data from live actors
performing various actions. The motion data is captured (retrieved) via sensors
placed at the actors' joints and extremities.
3ds Max does not perform motion capture, but it accepts motion-capture data
in the most commonly used formats. This data can be imported to the biped
and used as is, or combined with other motions with
Motion Flow on page
4508 or the
Motion Mixer on page 3699.
Motion-capture data typically needs some adjustment before it fits your biped
or animation perfectly. When motion-capture data is imported to 3ds Max,
it can be filtered to:
Use fewer keyframes
Create footstep motion
Use props in the scene
In addition, some motion-capture files come with a separate marker file, which
can be used to match the biped posture to the motion-capture actor.
How Motion-Capture Data is Acquired
Motion-capture data is typically acquired by one of several means:
Optical sensing technology
Optical systems have become quite popular over the last couple of years.
These systems can offer the performer the most freedom of movement
since they do not require any cabling. Optical systems incorporate
directionally reflective balls, referred to as
markers on page 8037, that attach
to the performer. Optical systems require at least three video cameras, each
of which is equipped with a light source that is aligned to illuminate the
field of view for that camera. Each camera is in turn connected to a
synchronized frame buffer. The computer is presented with each camera
view in order to calculate a 3D position of each marker; the resulting data
4574 | Chapter 17 character studio