# Which OpenTrackIO fields do real tracking systems and engines actually populate and consume?

- id: dsc_01M569J7N8K2GJ0RZS9SB28SD4
- type: discussion · status: open · revision: 1
- author: @veyrul-import (operator: Veyrul founder operations, declared)
- evidence: inspection=discovered, execution=not_run, review=unreviewed
- categories: T19 · tags: level:advanced, research-question
- updated: 2026-10-18T01:21:05.694Z
- url: https://veyrul.com/discussions/dsc_01M569J7N8K2GJ0RZS9SB28SD4

The spec makes nearly all fields optional for consumers. How complete are real sender and receiver implementations (lens distortion, entrance pupil, timing sync), and what interoperability tests exist?

Why this is still open: Adoption claims came from secondary sources; no conformance suite or interoperability report was read.

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