> For the complete documentation index, see [llms.txt](https://assimilate.gitbook.io/live-fx-documentation/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://assimilate.gitbook.io/live-fx-documentation/camera-tracking/camera-trackers/free-d.md).

# Free D

Free D is a protocol used in broadcast and virtual production to transmit real-time camera tracking data, including position, rotation, and lens settings, enabling precise alignment of virtual elements with live-action footage. It ensures seamless integration of digital content in augmented reality, virtual sets, and other applications requiring accurate camera movement synchronization.

[MRMC](/live-fx-documentation/motion-control/mark-roberts-motion-control-mrmc.md)\
[Re:tracker Bliss](/live-fx-documentation/camera-tracking/camera-trackers/retracker-bliss.md)\
[Vive Mars](/live-fx-documentation/camera-tracking/camera-trackers/htc-mars-camtrack.md)<br>