WorldViz PPT-E, Руководство по эксплуатации, Страница: 74 / 163

PPT User’s Manual
68
1. Add the Log data Post-Process Plugin found in the Configure Pane.
2. Press the Log data plugin configuration button.
3. Configure the data options and press Start Logging.
Data Output:
 When logging is complete, the log file will be written to the log directory of the
PPT installation which by default is in C:\Program
Files\WorldViz\PPTStudio31\log.
MARKER IDENTIFICATION
A traditional PPT system does not
provide absolute marker
identification for 3DOF position
markers. The markers are passive
devices that do not contain any
identification information of their
own. In practice, however, PPT
does an excellent job at
maintaining marker identification
coherence so often you can rely
on the identities not to change
during period of continuous
capture. A scenario where marker
coherence can fail is when two
markers are brought together so
they are touching, and then
moved away again.
Keeping the identification of each marker coherent is important in some applications,
particularly motion capture, where an incorrect identification can cause confusing
output.
Mocap Plugin
PPT includes a Mocap plugin that can be used with traditional markers to robustly
identify markers attached to the head, hands, and feet, which is suitable for motion
capture applications. The Mocap plugin uses heuristics and knowledge of the
geometry of a user's body to assist with this identification. Each body part is
assigned to a fixed marker id, and so your client application will receive the markers
in a constant order. If PPT gets temporarily confused about the marker ordering, it
will correct this automatically once it discovers the correct marker arrangement. For
more information about how to use this plugin in a motion capture scenario, please
read the extensive
PPT Mocap section.