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Tracking Origin Offset
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Position and rotation offset of the tracking system relative to the current tracking origin in the configuration (the projection geometry or the tracking origin node if specified).
Тhis is the distance between the Camera Tracking System Origin (usually somewhere on the floor) on one hand and the Tracking Origin Node (if included in the .vrscene containing the geometry of the LED wall) or the pivot point of the wall geometry (if there is no Tracking Origin Node). If the Tracking Origin Node matches the actual tracking system origin perfectly, these offsets should be zero.
Camera Offset
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Position and rotation offset of the camera's entrance pupil and orientation from the tracker's center point and orientation.
Тhis is the distance between the lens nodal point (usually inside the lens in front of the sensor) and the pivot point of the tracker which depends on the camera tracking solution (stYpe, Mo-Sys, Vicon, etc.)
Auto-Apply – If enabled, changes to the offsets, FOV, or camera ID are applied immediately during rendering without having to press the Apply Configuration button.
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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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Example
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Anchor CameraOffset CameraOffset
In the example below, using the Vive Mars tracking system, the center of the tracker occurs at the base of the Vive tracker, that is why the measurements start from there.
In the example below you can see how the Tracking Origin Offset is used.
The Tracking Origin offset is the distance between the Tracking Origin Node (if included in the .vrscene containing the geometry of the LED wall) and the Camera Tracking System Origin (usually somewhere on the floor). This example assumes that the tracking system's forward direction is pointing towards the screen.
