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How the Polaris Vicra System Works
•
transformations for tools that are outside of the characterized measurement volume
•
positions of stray passive markers
NDI ToolBox displays most of this returned information (except for the port handle information).
Note
For information on the API commands used to request tracking information from the Polaris Vicra System, see
the "Polaris Application Program Interface Guide".
3.3
Global Coordinate System and Measurement Volume
Global Coordinate System
The Polaris Vicra Position Sensor uses a coordinate system with an origin located at the Position
Sensor and axes aligned as shown in
manufacturing and cannot be changed.
Do not use the Polaris Vicra System for absolute measurements; the system is designed for relative
measurements only. Treating measurements as absolute may result in an incorrect interpretation of results. If
your application involves personal safety, these incorrect interpretations increase the possibility of personal
Warning!
injury.
The Polaris Vicra System will report the transformations of tools in the global coordinate system.
However, if you are using a reference tool, software can calculate and report transformations in the
local coordinate system of the reference tool. For more information on reference tools, see
"Reference Tool" on page
Field of View and Characterized Measurement Volume
The field of view is the total volume in which the Polaris Vicra System can detect a marker,
regardless of accuracy.
26
Figure
3-1. This global coordinate system is defined during
-x
Origin
-z
Figure 3-1 Position Sensor Global Coordinate System
36.
-y
Polaris Vicra User Guide - Revision 2
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