System information

Vicon MX Hardware System Reference Glossary-29
Volume See Capture volume,
Calibration volume, Reconstruction
volume, and Tracking volume.
Volume origin The coordinates (0,0,0)
identifying the origin of the world in the
context of the capture volume or tracking
volume. The volume origin is specified
during the system calibration process.
Also see Capture volume, Tracking
volume, and System calibration.
.vpi file Vicon Plug-In file. A C++ DLL
file with extension .vpi, which is a user-
defined plug-in to Workstation application
software that has been written using the
Vicon Software Development Kit (SDK). A
.vpi file is included in Workstation as a
pipeline operation in the Vicon Plug-ins
directory (by default, C:\Program Files
\Vicon\Plugins). These .vpi files can be
run in Nexus through the Pipeline tool
pane and are stored in the Workstation
Plug-ins directory (by default,
C:\Program Files\Vicon\Nexus
\WorkstationPlugIns). Also see Nexus,
Pipeline, Plug-in, and Workstation.
.vsk file Vicon Skeleton file. An XML file
with extension .vsk, which contains a
kinematic model that describes the
relationships between the segments,
joints, and Vicon markers for a specific
subject or object of the type described in
the associated Vicon Skeleton Template
(.vst) file. For example, if the .vst file
represents a human being, the .vsk file
contains a kinematic model of an
individual person. The Vicon application
software uses the .vsk file to track and
label markers and segments for that
subject. By default, .vsk files are saved to
the active Session folder of the open
database. Also see Eclipse database,
Kinematic model, Marker, Object,
Segment, Subject, and .vst file.
.vst file Vicon Skeleton Template file.
An XML file with extension .vst, which
contains a kinematic model that describes
the generic relationships between
segments, joints, and Vicon markers for a
certain type of subject or object. For
example, a .vst file may be used to
represent a human being, a calibration
object, or a prop. You can use any of the
default .vst files supplied with your Vicon
application software or create your own
to suit your particular needs. Also see
Kinematic model, Marker, Object,
Segment, Subject, .vsk file.
.vtt file Vicon Threshold Table file. An
XML file with extension .vtt, which
contains the set of threshold grids
defined to discard (or in some Vicon
application software reduce the data
intensity of) defined areas of 2D data
visible to MX cameras in a Vicon MX
system. By default, .vtt files are saved to
the active Session folder of the open
database. Similar functionality is provided
by the .xcp file in Nexus. Also see
MX Camera, Threshold grid, and .xcp file.
W
Walking speed A temporal parameter
used in gait analysis for the speed of the
current foot based on stride time and
stride length. Also see Gait analysis,
Stride length, and Stride time.
Wand See Calibration wand.
Workspace The area in the view pane
in which data can be viewed and
manipulated. The type of workspace
displayed depends on the type of view
pane selected. Also see View pane and
3D Workspace.
Workspace axes A visual
representation in some Vicon application
software of the X, Y, and Z axes in the
global coordinate system. These axes are
specified as part of the system calibration
process. They can be visualized in the
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