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Comment: Clarified the coordinate systems of the tracking offsets.

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The coordinate system used for all offsets is (+X right, +Y forward, +Z up). Distances are in centimeters. Rotations are described as (pan, tilt, roll) in degrees. Positive pan angle corresponds to a pan to the right. Positive tilt angle corresponds to an upwards tilt. A positive roll angle corresponds to a clockwise roll when viewed from behind.

The forward direction for the Camera Offset is the forward (look) direction of the camera.

The forward direction for the Tracking Origin Offset is the forward direction of the tracking system, which is not always pointing towards the screen. It depends on the tracking system and how it's calibrated.

OptiTrack

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The OptiTrack integration is different from most of the others as it uses a third party library for connecting to a server - normally the OptiTrack Motive application. Most of the other protocols are just connectionless UDP listeners that open a network port and listen for data on it.

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