Rulez777--FramePicoTracker/docs/RESEARCH_TREE.md

Research tree and dependencies

flowchart TD
 G[Standalone body tracking on Steam Frame] --> R[Onboard Roy radio]
 G --> O[Measured optical pose]
 G --> I[Measured IMU and fusion]
 G --> D[SteamVR and body roles]
 R --> P[Stock protocol and identities]
 R --> S[SRAM lifecycle and controller coexistence]
 R --> F[Version-bound tracker changes and mode proof]
 O --> C[Native camera acquisition and calibration]
 O --> K[Clock domains and exposure]
 O --> A[Detection, correspondence and geometry]
 O --> T[Causal identity and phase admission]
 I --> Q[Native sample selection and counter feedback]
 I --> Y[Time offset, axes, bias and gap admission]
 D --> U[Dashboard and owner-bound API]
 D --> B[Roles, occlusion and multi-tracker quality]
 T --> F
 T --> K
 I --> T
 D --> O
 D --> I

Historical branches

1. Official SDK/PC bridge: PICO Unity SDK→TCP→PC→VMT. Useful coordinate/protocol reference, but a different architecture; it does not satisfy onboard standalone operation.
2. Passive stock-radio research: packet shape, CRC, whitening/address reconstruction, full identity provenance, channels, bootstrap/personal addressing and reconnect persistence. Early silence was a low-coverage negative, not device absence.
3. Temporary Roy station: bounded SRAM receiver, active negotiation, three-peer captures, continuous-service/controller regression, MPSL request/overstay issues, TX timing and safe teardown.
4. FW189 experiments: exact stock container/application identity; grid-only patch; dual-mode startup/mode query; revisions07–11, observer schemas and guarded OTA/activation. Installed diagnostic10 is the protected branch; candidate11 is not installed proof.
5. Mode and sample gates: nonce-correlated native applied-mode/N/pending state; native sensor initialization/state32/upstream gates; command19 admission; finite mode lease and ACK retirement.
6. Camera acquisition: OCC/native recording, exact H264 packet timestamps, serial-bound active calibration, KB projection, HEAD/CAD/world transforms, RAW/MONO/BOOTTIME distinction and per-boot clock evidence.
7. Optical identification: LED constellations, native-derived contrast/contour findings, P3P/root ambiguity, stereo correspondence, triangulated hints, unchanged refinement/covariance gates and causal dark/lit evidence.
8. IMU delivery/fusion: native ring selection, command11 feedback, measured sample counter period, physical time offset/axis/bias calibration, no interpolation across missing measurements.
9. Three-peer RAM/body branch: deferred state islands and owned DMA layout, fixed MPU/code budgets, mailbox code hazards, native body-pose interface investigation; no shipped vendor model/library and no demonstrated full body.
10. App and pilot lifecycle: native dashboard Game/Service modes, owner-specific stream routing, sealed profiles, preflight executable checks, actual393-v2 mode proof, optical latency/profile probes and continued strict pose invalidation.

catalog/RESEARCH_GRAPH.json supplies machine-readable nodes and evidence edges. research/INDEX.md contains the deduplicated narrative ledger. catalog/RESEARCH_DOCUMENTS.json accounts for every discovered Markdown version, including historical backups. A later node corrects a specific claim; it does not delete the experiment that produced it.