Commonwealth-Online-Public/docs/dev-log.md

Development Log

This file tracks development progress for Fallout 4 Together.

Use this log to record setup decisions, tool versions, technical discoveries, failed experiments, successful tests, and next steps.

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2026-05-30 - Repository Setup

What Changed

• Created the Fallout 4 Together repository.
• Added the initial repository folder structure.
• Added starter Markdown documentation files.
• Added project roadmap, disclaimer, setup notes, protocol notes, and plugin planning documents.

Current Focus

The current focus is setting up the early development environment before writing multiplayer logic.

The immediate priority is to make sure the project has:

• A documented target Fallout 4 version
• A documented F4SE version
• A chosen CommonLibF4 plugin template
• A clean Fallout 4 test profile
• A basic native plugin that can load through F4SE

Decisions Made

• Project name: Fallout 4 Together
• Internal prefix: F4T
• Primary target platform: Steam Fallout 4
• First prototype goal: two clients in a controlled test cell, with each player visible as a synced remote actor
• Early test cell name: F4TTestCell01
• Early test ESP name: Fallout4Together_Test.esp
• Early plugin DLL name: Fallout4Together.dll

Current Status

Repository created
Documentation structure added
Version tracking started
No plugin code yet
No server code yet
No Creation Kit test cell yet

Next Steps

• Add docs/version-targets.md to the repository.
• Fill in the exact installed Fallout 4 version.
• Fill in the exact installed F4SE version.
• Choose a CommonLibF4 plugin template.
• Create the first GitHub milestones.
• Create the first GitHub issues.
• Set up a clean Fallout 4 test profile.
• Build an empty F4SE plugin.
• Confirm the empty plugin loads in Fallout 4.

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2026-05-31 - Initial DLL Load

What Changed

• Built the initial Fallout 4 Together DLL.
• Installed the DLL into Data/F4SE/Plugins/.
• Launched Fallout 4 through F4SE.

What Worked

• The plugin loaded successfully.
• The plugin wrote a log file.
• The template test message Hello World! appeared in the log.

What Broke

• The plugin is still using the template log name and identity.

Notes

• The current log file is named commonlibf4-template.log.
• The next step is to rename the plugin identity and log output to Fallout4Together.

Next Steps

• Replace template name references with Fallout4Together.
• Replace Hello World! with a Fallout 4 Together startup message.
• Rebuild the DLL.
• Launch through F4SE again.
• Confirm Fallout4Together.log is created.

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2026-05-31 - Plugin Identity Renamed

What Changed

• Renamed the plugin/log identity from the CommonLibF4 template to Fallout4Together.
• Rebuilt and installed Fallout4Together.dll.
• Launched Fallout 4 through F4SE.

What Worked

• Fallout4Together.log was created.
• The plugin loaded successfully.
• The plugin startup code executed.

What Broke

• Nothing currently recorded.

Notes

• The log still contains the template message Hello World!.
• Next step is to replace this message with a Fallout 4 Together startup message.

Next Steps

• Replace Hello World! with a proper plugin startup log message.
• Rebuild and reinstall the DLL.
• Confirm the updated message appears in Fallout4Together.log.
• Begin testing local player position readout.

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2026-05-31 - Local Player Position Readout

What Changed

• Updated the Fallout 4 Together plugin startup message.
• Added local player position readout.
• Logged the player's X, Y, Z position and Z rotation angle.

What Worked

• Fallout4Together.dll built successfully.
• Fallout 4 launched through F4SE.
• Fallout4Together.log was created.
• The plugin loaded successfully.
• The plugin safely read and logged the local player position.

What Broke

• Nothing recorded.

Notes

• The first successful player position log was:

Player position: X=2048.00, Y=2048.00, Z=0.00, AngleZ=0.00

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2026-05-31 - Movement Logging Throttled

What Changed

• Updated player position logging so it only writes when the player position changes.
• Added throttling so movement updates do not flood the log.
• Rebuilt and tested Fallout4Together.dll.

What Worked

• Fallout 4 launched through F4SE.
• Fallout4Together.log was created.
• The plugin logged the player position while moving.
• Position logging now updates at a readable pace instead of many times per second.

What Broke

• Nothing recorded.

Notes

• The player transform readout milestone is now working.
• The plugin can access the local player and track movement changes.

Next Steps

• Create a local test server.
• Send player transform data from the plugin to the server.
• Keep the first network test local-only.

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2026-05-31 - Local Server Connection

What Changed

• Added a local Python test server.
• Added basic networking from the Fallout 4 Together plugin to the local server.
• Sent player transform data from Fallout 4 to the server.
• Server now prints received transform packets.

What Worked

• server/server.py runs successfully.
• Server listens on 127.0.0.1:7777.
• Fallout 4 launches through F4SE.
• The plugin connects to the local server.
• Moving the player sends transform packets to the server.
• Server prints X, Y, Z, and AngleZ values.
• Server handles client disconnects safely.

What Broke

• Nothing recorded.

Notes

• First successful server connection used local client port 55912.
• The server received live player transform data from Fallout 4.
• This confirms the basic data path from game plugin to external server.

Next Steps

• Add a player ID or client ID to transform packets.
• Add timestamps to transform packets.
• Have the server echo/broadcast transform packets to connected clients.
• Add a fake test client before attempting a second Fallout 4 client.

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2026-05-31 - Transform Metadata Added

What Changed

• Added transform metadata for movement type, cell ID, and worldspace ID.
• Updated transform packets to include movementType.
• Added detection for cell changes and worldspace changes.
• Updated the server to print the additional transform fields.

What Worked

• Normal movement packets still send correctly.
• Cell changes are detected and sent as movementType=cell_change.
• Worldspace changes are detected and sent as movementType=worldspace_change.
• Transform packets now include cellId and worldspaceId.
• The server remains compatible with the expanded packet format.
• The server handled client disconnects safely.

What Broke

• Nothing recorded.

Notes

• Example normal movement packet included cellId=0000DD5F and worldspaceId=0000003C.
• Example cell change packet included movementType=cell_change.
• Interior cell behavior should be verified later, especially whether worldspaceId should be null or inherited.

Next Steps

• Add playerId to transform packets.
• Add packet timestamps.
• Add server-side client IDs.
• Make the server broadcast transform packets to other connected clients.
• Create a fake client to receive broadcast packets.

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2026-05-31 - Server Broadcast And Fake Client

What Changed

• Updated the local server to assign incrementing player IDs.
• Added welcome packets for newly connected clients.
• Added server-side timestamps to transform packets.
• Added server broadcast support for transform packets.
• Added a receiver-only fake client.
• Added client-side timestamps to plugin transform packets.
• Updated server documentation with the fake-client test flow.

What Worked

• server/server.py compiles with python -m py_compile.
• server/fake_client.py compiles with python -m py_compile.
• The server accepts multiple clients.
• The server assigns player IDs.
• The server broadcasts transform packets to clients other than the sender.
• The fake client receives broadcast transform packets.
• The plugin still builds successfully with xmake build.

What Broke

• Nothing recorded.

Notes

• The plugin does not yet read welcome packets from the server.
• Server-to-plugin receive handling is intentionally left as a TODO.
• The fake client exists so transform broadcast can be tested before running two Fallout 4 clients.

Next Steps

• Run the full test with Fallout 4, the server, and the fake client.
• Confirm the fake client receives live transform packets from the Fallout 4 plugin.
• Add protocol documentation for playerId, clientTime, and serverTime.
• Begin planning remote player state storage on the receiving client.

---

2026-05-31 - Full Broadcast Flow Tested

What Changed

• Tested the full server broadcast flow.
• Connected a fake Python client to the local server.
• Connected the Fallout 4 Together plugin as a second client.
• Confirmed that transform packets from the Fallout 4 plugin are broadcast to the fake client.

What Worked

• The server assigned player IDs to connected clients.
• The fake client received a welcome packet.
• The Fallout 4 plugin connected to the server.
• The server received transform packets from the Fallout 4 plugin.
• The server added playerId and serverTime fields.
• The server broadcast transform packets to other clients.
• The fake client received live Fallout 4 transform packets.
• Cell change and worldspace movement types were preserved through broadcast.

What Broke

• Nothing recorded.

Notes

• In the successful test, the fake client connected as player 1.
• The Fallout 4 plugin connected as player 2.
• The server broadcast player 2 movement to player 1.
• This confirms the first working relay path from Fallout 4 to another connected client.

Next Steps

• Make fake_client.py store remote player state instead of only printing packets.
• Track remote players by playerId.
• Store position, rotation, cellId, worldspaceId, movementType, and last update time.
• Print a readable remote player state table.

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2026-05-31 - Fake Client Remote State

What Changed

• Updated fake_client.py so it stores remote player state by playerId.
• Remote player state now tracks position, angle, movement type, cell ID, worldspace ID, server time, and local receive time.
• Tested the full relay flow from Fallout 4 plugin to server to fake client.

What Worked

• The server received transform packets from the Fallout 4 plugin.
• The server assigned the Fallout 4 plugin a player ID.
• The server broadcast transform packets to the fake client.
• The fake client received transform packets.
• The fake client updated remote player state for player 2.
• Cell changes and worldspace metadata were preserved.

What Broke

• Nothing recorded.

Notes

• clientTime currently appears as None in fake client output.
• This should be investigated before building the Fallout-side receive loop.
• The fake client now models the kind of remote player state table that the eventual Fallout 4 receiving client will need.

Next Steps

• Fix or verify clientTime in outgoing plugin transform packets.
• Add disconnect packet broadcasting so fake clients can remove disconnected remote players.
• Then begin planning a plugin receive loop for server messages.

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2026-05-31 - Client Time Fixed

What Changed

• Fixed clientTime in transform packets.
• Confirmed the Fallout 4 plugin sends clientTime.
• Confirmed the server preserves and broadcasts clientTime.
• Confirmed the fake client receives and stores clientTime.

What Worked

• clientTime now appears in server output.
• clientTime now appears in fake client remote player state.
• serverTime is still added by the server.
• Remote player state now has both client-side and server-side timing data.

What Broke

• Nothing recorded.

Notes

• The packet timing fields are now suitable for later interpolation experiments.
• The next lifecycle feature should be disconnect broadcasting.

Next Steps

• Add disconnect packets when a client leaves.
• Have fake clients remove remote players when disconnect packets are received.

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2026-05-31 - Disconnect Lifecycle

What Changed

• Added server-side disconnect packet broadcasting.
• Updated the fake client to handle disconnect packets.
• Fake client now removes disconnected remote players from its remote player state table.
• Tested disconnect lifecycle using the Fallout 4 plugin and fake client.

What Worked

• Server detected the Fallout 4 plugin disconnecting.
• Server removed the disconnected client.
• Server broadcast a disconnect packet to remaining clients.
• Fake client received the disconnect packet.
• Fake client removed remote player 2 from its state table.
• Fake client correctly reported that no remote players were currently tracked.

What Broke

• Nothing recorded.

Notes

• The fake client reported WinError 10054 after the server was stopped manually. This is expected during shutdown and is not a protocol issue.
• The basic networking lifecycle now works: connect, welcome, transform, disconnect, cleanup.

Next Steps

• Add protocol documentation for welcome, transform, and disconnect packets.
• Begin planning a Fallout 4 plugin receive loop.
• Store remote player state inside the plugin, without spawning actors yet.

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2026-05-31 - Protocol Documentation Updated

What Changed

• Documented the current networking protocol.
• Documented welcome, transform, and disconnect packets.
• Documented the fake client remote player state model.
• Documented the current server and fake client test flow.

What Worked

• The networking lifecycle now includes connect, welcome, transform broadcast, disconnect broadcast, and remote-player cleanup.
• clientTime and serverTime are both present in transform packets.
• The fake client can store and remove remote player state.

What Broke

• Nothing recorded.

Notes

• The Fallout 4 plugin does not yet receive server packets.
• The current receiver is server/fake_client.py.
• The next technical milestone is a Fallout 4 plugin receive loop that stores remote player state internally.

Next Steps

• Add a plugin receive loop.
• Parse welcome, transform, and disconnect packets in the plugin.
• Store remote player state inside the plugin.
• Do not spawn remote actors yet.

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2026-05-31 - Plugin Receive State Implemented

What Changed

• Added plugin-side receiving for server welcome, transform, and disconnect packets.
• Added internal remote player state storage keyed by server-assigned playerId.
• Added defensive packet parsing so malformed or unknown packets are ignored without crashing the plugin.
• Kept remote actor spawning and movement out of scope.

What Worked

• The plugin now stores its assigned server playerId.
• Remote transforms can be stored internally without touching Fallout 4 actors or game objects.
• Disconnect packets remove remote player state.
• xmake build succeeds.

What Broke

• Nothing recorded.

Notes

• The receive loop runs on a background networking thread.
• Remote transform logging is throttled so Fallout4Together.log remains readable.
• Actor spawning, actor movement, animation sync, combat sync, inventory sync, quest sync, and settlement sync remain planned later.

Next Steps

• Test with Fallout 4 launched through F4SE against server/server.py.
• Add a controlled game-thread reader for remote player snapshots before any actor spawning work.

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2026-05-31 - Per-Instance Client Log Prefixes

What Changed

• Added a shared local-player log prefix helper for plugin networking logs.
• Prefixed important startup, connection, welcome, transform send, remote update, disconnect, and networking warning logs with [LocalPlayerId=unassigned] or [LocalPlayerId=N].
• Kept the existing Fallout4Together.log file name and avoided per-instance log files for this milestone.

What Worked

• The prefix reads the existing assigned player ID state through the thread-safe remote-player state accessor.
• Remote player state storage and packet relay behavior remain unchanged.

What Broke

• Nothing recorded.

Notes

• Actor spawning, actor movement, gameplay sync, and protocol changes remain out of scope.
• A future launcher/profile milestone can revisit separate per-instance log files.

Next Steps

• Test two Fallout 4 instances through F4SE and confirm prefixed remote update/disconnect logs are readable in the shared log file.

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2026-05-31 - Placed Proxy Actor Control

What Changed

• Fixed proxy actor lookup for F4TProxyRemotePlayer01REF.
• Added more robust lookup logic for the placed proxy actor.
• Confirmed the plugin can control a placed actor reference in F4TTestCell01.
• The proxy actor now moves to the local player position plus an offset.

What Worked

• Fallout 4 launched through F4SE.
• coc F4TTestCell01 worked.
• The proxy actor was found successfully.
• The proxy actor teleported to the player position plus offset.
• Actor movement occurred from the safe game-thread update path.
• The networking receive thread still does not touch Fallout 4 actors.

What Broke

• Nothing recorded.

Notes

• This is the first successful visible actor-control test for Fallout 4 Together.
• The proxy is still driven by local player position plus offset, not remote player state.
• Dynamic spawning is still not implemented.
• Remote actor syncing has not started yet.

Next Steps

• Replace local-player-offset movement with remote player state movement.
• Only move the proxy when the remote player is in the same cell/worldspace.
• Snap movement first.
• Add smoothing/interpolation later.

---

2026-05-31 - Remote-State Proxy Movement

What Changed

• Changed the proxy actor controller plan from local-player-offset movement to remote-state-driven movement.
• The placed proxy actor F4TProxyRemotePlayer01REF now represents the lowest available remote playerId from a copied remote-player snapshot.
• Proxy movement remains game-thread-only and throttled to roughly 5 Hz.
• The networking receive thread still only parses packets and updates plain remote-player state.
• Relaxed receive-side transform validation so interior/test-cell packets only require cellId; missing worldspaceId is stored as an empty string.
• Added a same-test-cell proxy movement log for F4TTestCell01.

What Worked

• Existing proxy actor lookup and safe handle caching were preserved.
• The local-player-offset safety movement remains available as a debug fallback mode in code.

What Broke

• Not tested in-game yet.

Notes

• The proxy is left wherever it last moved after a remote disconnect for now.
• Dynamic spawning, multiple proxy actors, interpolation, and gameplay sync are still intentionally out of scope.

Next Steps

• Build the plugin with xmake build.
• Run the single-client, two-client, and disconnect tests in F4TTestCell01.

---

2026-06-02 - Remote Proxy Smoothing

What Changed

• Added simple position smoothing for normal remote proxy movement.
• Kept proxy actor movement on the F4TProxyActorController game-thread update path using copied remote-player snapshots.
• Kept the single-proxy, lowest-playerId selection behavior.
• Added snap movement for cell_change, worldspace_change, and teleport remote transforms.
• Left rotation snapping in place with a TODO for wrapped angle smoothing.
• Left the proxy idle at its last position when the represented remote player disconnects, disappears, or leaves the same cell.
• Added readable one-shot and throttled logs for smoothing, first smoothed movement, special movement snaps, disappearance, and same-cell mismatch idle behavior.

What Worked

• Dynamic spawning and multiple proxy actors remain out of scope.
• Networking still only updates plain remote-player state and does not touch Fallout 4 actors or references.

What Broke

• Not tested in-game yet.

Notes

• Hiding or disabling the proxy actor is still deferred. The current safe behavior is to leave the placed proxy idle at its last valid position.

Next Steps

• Build the plugin with xmake build.
• Run the single-client, two-client, special-movement, disconnect, and cell-leave tests in F4TTestCell01.

---

2026-06-02 - Smooth Remote Proxy Movement Tested

What Changed

• Separated normal local transform send cadence from local movement log cadence.
• Lowered normal transform send thresholds to support smoother remote motion: about 3 game units of position change or 0.02 radians of rotation change.
• Targeted normal transform sends at roughly 10 Hz while moving, without sending every frame.
• Kept local movement logs readable at the slower debug interval.
• Kept cell_change, worldspace_change, and teleport sends immediate and baseline-updating.
• Removed the 200 ms throttle from remote-player proxy visual movement on the game-thread update path.
• Tuned normal proxy position smoothing to a per-update lerp alpha near 0.15.
• Preserved direct snapping for special remote movement types and kept rotation snapping through the existing safe heading path.

What Worked

• The networking receive thread remains actor-free and still only updates plain remote-player state.
• The single placed proxy actor remains the only remote visual representation; dynamic spawning and multiple proxy actors are still out of scope.
• Two Fallout 4 clients can still connect to the local server.
• Server transform relay still works.
• Remote player state still updates correctly.
• The proxy actor now moves smoothly compared to the previous snapping/jittery version.
• The current visual result is close to feeling correct, with animation sync now being the obvious missing piece.

What Broke

• Nothing recorded.

Notes

• server/server.py and server/fake_client.py were intentionally left unchanged because the transform packet protocol did not need to change.
• This is the first smooth visible multiplayer prototype for Fallout 4 Together.
• The proxy actor still lacks synced animations.
• Only one proxy actor is supported.
• Dynamic spawning is not implemented.
• Combat, inventory, quest, settlement, interaction, and animation sync remain out of scope for this milestone.

Next Steps

• Add basic movement state sync.
• Start with simple animation-related states like idle, walking, running, sprinting, crouching, jumping, and weapon drawn.
• Keep animation sync separate from combat and inventory sync.

---

2026-06-02 - Basic Movement State Sync

What Changed

• Added data-only movement state fields to transform packets: isMoving, isSprinting, isSneaking, isJumping, weaponDrawn, and movementSpeed.
• Derived local movement speed from sampled position delta over elapsed time on the game-thread polling path.
• Stored optional movement state fields in remote-player state with safe defaults for older packets.
• Added throttled remote movement-state logs so packet data can be inspected without logging every transform.
• Updated server/fake_client.py to display movement state while keeping missing fields backwards compatible.

What Worked

• The server relay remains unchanged because it preserves unknown transform fields when it adds playerId and serverTime.
• The networking receive thread remains actor-free and only updates plain remote-player state.
• Proxy actor movement remains unchanged; movement state is not applied to animations yet.

What Broke

• Nothing recorded.

Notes

• This milestone prepares the remote-player data model for later proxy animation or behavior work.
• Dynamic spawning, multiple proxy actors, animation graph sync, combat, inventory, quest, settlement, and interaction sync remain out of scope.

Next Steps

• Test with two Fallout 4 clients in F4TTestCell01.
• Use the synced state in a later animation milestone without expanding gameplay sync scope.

---

2026-06-02 - Proxy Sneak State Observation

What Changed

• Added a log-only movement-state behaviour hook in F4TProxyActorController.
• The single represented proxy now observes the remote player's isSneaking value after the normal same-cell validation.
• Added controller-local tracking for the represented remote playerId and its last observed sneak state so logs happen only on transitions.
• Reset sneak-state tracking when the represented remote player changes or disappears.

What Worked

• Existing smooth proxy transform movement remains unchanged.
• Special movement types still snap through the existing movement path.
• The networking receive thread remains actor-free and continues to update only plain remote-player state.

What Broke

• Nothing recorded.

Notes

• This milestone intentionally does not force the proxy to crouch visually.
• Animation graph variables/events, direct ActorState writes, and PerformAction(kActionSneak) remain out of scope until a safe actor crouch API is confirmed.
• Dynamic spawning, multiple proxy actors, combat, inventory, quest, settlement, weapon, and interaction sync remain out of scope.

Next Steps

• Test with two Fallout 4 clients in F4TTestCell01 and confirm sneak toggles produce one log line per transition.
• Research a safe visual crouch/sneak application path for the placed proxy actor.

---

2026-06-02 - Local Sneak Detection Diagnostics

What Changed

• Improved local isSneaking detection to combine safe read-only signals from PlayerCharacter::IsSneaking(), actor-state stance, and actor-state forceSneak.
• Added throttled local sneak diagnostics showing each read-only signal and the final isSneaking value sent in transform packets.
• Kept movement-state change detection unchanged, so isSneaking transitions can trigger transform sends even without a meaningful position delta.

What Worked

• The networking protocol remains unchanged and backwards compatible.
• The receive thread remains actor-free.
• Proxy sneak behaviour remains log-only; no visual crouch is applied.

What Broke

• Nothing recorded.

Notes

• No animation graph variables/events, direct actor-state writes, or PerformAction(kActionSneak) were added.
• Server files and fake-client compatibility were left unchanged.

Next Steps

• Test crouch/sneak in-game and compare apiSneaking, actorStateSneaking, actorStateForceSneak, and finalIsSneaking in Fallout4Together.log.

---

2026-06-02 - Proxy Lifecycle Holding

What Changed

• Added controller-local lifecycle state for the single placed proxy actor.
• Added a temporary hidden holding position inside F4TTestCell01 for cases where no valid same-cell remote player should be represented.
• Moved the proxy to the holding position when the represented remote player disconnects, disappears from remote-player state, or leaves the local test cell.
• Restored representation by snapping the proxy to a valid same-cell remote player once before resuming existing smooth movement.
• Kept disconnect, no-remote-player, and cell-mismatch logs transition-based or throttled so the log does not spam every update.

What Worked

• Actor/reference access remains inside F4TProxyActorController on the game-thread update path.
• The networking protocol, Python server, and fake client remain unchanged.
• Existing smooth movement, special movement snapping, and sneak-state observation remain in place for valid same-cell remote players.

What Broke

• Nothing recorded during implementation.

Notes

• This milestone deliberately does not call Disable(), Enable(), SetAlpha(), invisibility APIs, or animation graph APIs.
• Dynamic spawning, multiple proxy actors, combat, inventory, quest, settlement, weapon/projectile, interaction, and animation sync remain out of scope.
• The holding position is a prototype-safe fallback until a hide/disable path is validated for the persistent placed proxy reference.

Next Steps

• Test single-client, two-client, disconnect, cell-leave, and return/reconnect flows in F4TTestCell01.
• If the holding fallback proves stable, separately validate whether a true hide/disable path is safe for the placed proxy reference.

---

2026-06-02 - Reusable Server Core Refactor

What Changed

• Split the Python relay server into a reusable server core and a thin terminal launcher.
• Added server/client_session.py to track connected client state, packet counters, last packet time, and last transform snapshots.
• Added server/server_core.py with FalloutTogetherServer lifecycle methods, log listeners, client snapshots, server stats, and thread-safe shared state.
• Updated server/README.md with the new server structure and validation commands.

What Worked

• The terminal command remains cd server followed by python server.py.
• The server still defaults to 127.0.0.1:7777.
• Newline-separated JSON handling, welcome packets, transform mutation, transform relay, disconnect relay, and unknown transform field preservation remain protocol-compatible.
• The refactor prepares the server for a future desktop dev-server UI without adding PySide6, fake-player management, movement scripts, or gameplay features.

What Broke

• Nothing recorded during implementation.

Notes

• The future UI can use FalloutTogetherServer.start(), stop(), is_running(), get_clients(), get_stats(), and log listener callbacks without scraping terminal output.
• Fallout 4 plugin code and network protocol fields were left unchanged.

Next Steps

• Run compile checks for the server files.
• Validate server startup, fake-client welcome handling, transform relay, and disconnect relay with fake clients and Fallout 4 plugin clients.

---

2026-06-02 - Dev Server GUI

What Changed

• Added a PySide6 desktop developer GUI for the reusable Python server core.
• Added a Server Console tab with start/stop controls, live server logs, live stats, and a connected-client table.
• Added a Fake Clients tab placeholder for future fake-client management and movement-script controls.
• Added a server-local requirements file for the GUI dependency.
• Updated server documentation with GUI install and run instructions while preserving the terminal server flow.

What Worked

• The GUI uses FalloutTogetherServer instead of duplicating networking logic.
• Server logs flow through add_log_listener(...) and a Qt signal bridge rather than stdout scraping.
• Stats and connected-client snapshots are refreshed through get_stats() and get_clients() on a QTimer.
• The terminal launcher, fake client, network protocol, and plugin code were left unchanged.

What Broke

• Nothing recorded during implementation.

Notes

• Fake client spawning and movement scripts remain intentionally unimplemented.
• Full GUI interaction and Fallout 4/F4SE validation still need to be run manually on the desktop.

Testing

• Ran python -m py_compile server.py server_core.py client_session.py fake_client.py dev_server_app.py from server; it succeeded.
• Checked IDE lints for the new GUI and edited docs; no diagnostics were reported.
• Checked the current Python environment for PySide6; it is not installed, so pip install -r requirements.txt is required before launching the GUI.
• Did not start a duplicate terminal server because an existing python server.py session and python fake_client.py session were already present.

Next Steps

• Run python dev_server_app.py, click Start Server, and connect fake_client.py.
• Launch Fallout 4 through F4SE and confirm the plugin appears in the GUI client table with transform stats updating.

---

2026-06-02 - GUI Fake Client Manager

Summary

Added GUI-managed synthetic TCP clients for local relay testing. Fake clients connect through the normal server socket, receive a welcome playerId, send one idle transform per second for F4TTestCell01, and disconnect cleanly from the Fake Clients tab or when the GUI server stops.

Files Changed

• server/fake_player.py
• server/dev_server_app.py
• server/README.md
• docs/dev-log.md

Details

• Added FakePlayerClient and FakePlayerManager as GUI test tooling only.
• Fake clients use TCP 127.0.0.1:7777 and newline-separated JSON packets, so the server sees them as normal external clients.
• The Fake Clients tab now supports + Add Fake Client and - Remove Selected.
• Fake-client lifecycle logs are routed to the GUI console with a [FakeClient] prefix through the Qt signal bridge.
• Stopping or closing the GUI disconnects all fake clients before stopping the server.
• The Fallout 4 plugin, network protocol, terminal server launcher, and standalone fake_client.py were left unchanged.

Testing

• Ran python -m py_compile server.py server_core.py client_session.py fake_client.py dev_server_app.py fake_player.py from server; it succeeded.
• Ran python server.py from server and confirmed the terminal launcher reached the expected listening state.
• Ran a headless fake-client smoke test on an alternate local port after 127.0.0.1:7777 was temporarily held by another process. The fake client received playerId 1, reached Connected, and the server recorded the idle transform for 0B000F99.
• Imported dev_server_app.py successfully to confirm the GUI module and PySide6 dependency load in the current Python environment.
• Not yet run: interactive python dev_server_app.py GUI clicks.
• Not yet run: Fallout 4/F4SE validation that a real client receives the fake client's idle transform in F4TTestCell01.

Known Issues

• No movement scripts beyond Idle are implemented yet.
• Full Fallout 4/F4SE validation still needs to be run manually.

Next Steps

• Add selectable fake-client movement scripts after the idle-client milestone is validated.
• Consider fake-client controls for script start/stop once multiple scripts exist.

---

2026-06-02 - Fake Client Walk To Player

Summary

Added Fake Clients tab movement controls and a first useful fake-client movement script. GUI-managed fake clients can now be set to Idle or Walk To Player while remaining ordinary external TCP clients that send normal transform packets through the Python server.

Files Changed

• server/fake_player.py
• server/dev_server_app.py
• server/README.md
• docs/dev-log.md

Details

• Added Idle and Walk To Player script modes to FakePlayerClient.
• Added thread-safe script switching, pose tracking, and target state for GUI-managed fake clients.
• Added Set Idle and Walk To Player buttons to the Fake Clients tab.
• Added safe selected-client handling with readable logs when no fake client is selected or the server is stopped.
• Walk To Player reads FalloutTogetherServer.get_clients() snapshots through a manager callback, filters out GUI-managed fake clients, and targets the lowest real playerId with a valid lastTransform.
• Walk To Player moves in a straight line toward the real player's latest transform plus a +150 X offset, sends moving transforms at about 10 Hz, and returns to low-rate idle keep-alive transforms after reaching the stop distance.
• No plugin code, protocol fields, server/server.py, or server/fake_client.py were changed.

Testing

• Ran python -m py_compile server.py server_core.py client_session.py fake_client.py dev_server_app.py fake_player.py from server; it succeeded.
• Still needs manual GUI validation with python dev_server_app.py.
• Still needs in-game Fallout 4/F4SE validation in F4TTestCell01.

Known Issues

• Walk To Player uses simple straight-line movement only; it does not perform pathfinding, navmesh checks, or obstacle avoidance.
• Additional fake-client scripts are still future work.

Next Steps

• Manually validate the GUI buttons with no real player connected and with a Fallout 4 client in F4TTestCell01.
• Add future dev/test scripts such as Walk Circle, Walk Square, Follow Player, Jump Loop, Sneak Toggle, Teleport Test, Leave Cell / Return, and Disconnect After Delay.

---

2026-06-02 - Fake Client Test Scripts

Summary

Added developer-only fake-client test scripts and actions to the PySide6 Fake Clients tab. GUI-managed fake clients can now test jump state, sneak state, circle movement, cell mismatch holding, return-to-cell behavior, and teleport snapping without launching multiple Fallout 4 instances.

Files Changed

• server/fake_player.py
• server/dev_server_app.py
• server/README.md
• docs/dev-log.md

Details

• Added Walk Circle and Left Cell continuous fake-client modes.
• Added one-shot Jump Once, Toggle Sneak, Return To Cell, and Teleport Test actions.
• Kept fake clients as external TCP clients that send normal newline-separated JSON transform packets through the existing server socket.
• Preserved the existing Idle and Walk To Player controls.
• Added Fake Clients tab buttons for Jump Once, Toggle Sneak, Walk Circle, Leave Cell, Return To Cell, and Teleport Test.
• Kept Fake Clients table columns unchanged while continuing to refresh script, cell, and position snapshots from the manager.
• Added a socket send lock and protected script, pose, movement flags, and one-shot action state with the existing client lock.
• Left the Fallout 4 plugin, protocol, server/server.py, server/fake_client.py, and server networking behavior unchanged.

Testing

• Ran python -m py_compile server.py server_core.py client_session.py fake_client.py dev_server_app.py fake_player.py from server; it succeeded.
• Checked editor diagnostics for server/fake_player.py and server/dev_server_app.py; no linter errors were reported.
• Ran a headless smoke test on alternate local port 7788; a GUI-managed fake client connected through the real server socket and exercised Walk Circle, Toggle Sneak, Jump Once, Leave Cell, Return To Cell, and Teleport Test without disconnecting.
• Not yet run: python server.py terminal launcher smoke test.
• Not yet run: python dev_server_app.py, start the server, add/remove fake clients, and click each Fake Clients script/action button.
• Not yet run: Fallout 4/F4SE validation inside F4TTestCell01 that Walk Circle, Jump Once, Toggle Sneak, Leave Cell, Return To Cell, and Teleport Test produce the expected proxy behavior.

Known Issues

• Full Fallout 4/F4SE validation still needs to be run manually.
• Walk Circle is a simple mathematical circle only; it does not use pathfinding, navmesh, or obstacle avoidance.

Next Steps

• Manually validate the GUI scripts with a real Fallout 4 client in F4TTestCell01.
• Consider future fake-client scripts such as Walk Square, Follow Player, Sprint Toggle, Weapon Drawn Toggle, Disconnect After Delay, and multi-fake-player choreography.

---

2026-06-02 - Runtime Proxy Actor Manager Stage 1

Summary

Added lookup-only diagnostics for the future runtime proxy actor path. The plugin now confirms whether Fallout4Together_Test.esp is loaded and whether the actor base F4T_RemotePlayerProxy resolves by editor ID or by its confirmed plugin-local form ID on the existing game-thread proxy controller path.

Files Changed

• plugin/src/F4TProxyActorController.cpp
• docs/dev-log.md
• docs/architecture.md

Details

• Added ResolveProxyActorBase() as a Stage 1 diagnostic function.
• Added a test ESP loaded check before actor-base lookup diagnostics.
• Tightened the diagnostic call site so it runs in F4TTestCell01 before placed proxy fallback lookup and before remote-player selection.
• Made runtime proxy actor-base log messages explicit for diagnostic searches: plugin loaded, lookup running, lookup resolved, or lookup failed.
• Uses LookupModByName as a fallback for the ESP loaded check, matching the mod lookup path already used by the placed-reference form ID fallback.
• Added editor-ID lookup for F4T_RemotePlayerProxy as a RE::TESNPC actor base and validation that the resolved form still has the expected editor ID.
• Added confirmed plugin-local FormID fallback lookup: LookupForm<RE::TESNPC>(0x0020A1, "Fallout4Together_Test.esp").
• Kept the actor-base local ID 0x0020A1 separate from the placed reference local ID 0x0020A2.
• Validates the resolved actor base is usable as the future NEW_REFR_DATA::object source before reporting success.
• Accepts the confirmed LookupForm<RE::TESNPC> result even if runtime editor ID extraction is unavailable or mismatched; editor ID mismatch is logged as a warning instead of rejecting the actor base.
• Logs fallback diagnostics including runtime form ID, local form ID, form type, TESNPC status, editor ID if available, display name if available, and whether the form was accepted.
• Logs whether actor-base lookup succeeded through editor ID lookup or plugin-local FormID fallback.
• Added clear one-shot or throttled logs for test ESP load status, actor-base lookup success, missing editor ID, or wrong form type.
• Did not call CreateReferenceAtLocation and did not spawn runtime actors.
• Left placed proxy lookup, smoothing, special movement snapping, holding lifecycle, and sneak-state observation unchanged.
• Left networking protocol, Python server code, and fake-client tooling unchanged.

Testing

• Ran xmake build from plugin; it succeeded.
• Pending: launch Fallout 4 through F4SE, load Fallout4Together_Test.esp, and coc F4TTestCell01.
• Pending: confirm Fallout4Together.log reports the test ESP load status and F4T_RemotePlayerProxy lookup result.
• Pending: confirm the existing placed proxy fallback still represents one fake client and still holds/restores correctly.

Known Issues

• Runtime actor spawning is intentionally not implemented in this stage.

Next Steps

• Run the build and in-game lookup diagnostics.
• After lookup is proven stable, proceed to Stage 2: one game-thread-only runtime spawn diagnostic in F4TTestCell01 while keeping the placed reference fallback.

---

2026-06-02 - Runtime Proxy Spawning Stage 2

Summary

Added a one-shot diagnostic runtime spawn attempt for F4T_RemotePlayerProxy in F4TTestCell01. The spawn runs only from the game-thread proxy controller path and remains separate from the placed proxy fallback, which is still the active remote player representation.

Files Changed

• plugin/src/F4TProxyActorController.cpp
• plugin/include/F4TProxyActorController.h
• docs/dev-log.md
• docs/architecture.md

Details

• Added kEnableRuntimeProxySpawnDiagnostic as the explicit internal gate for the Stage 2 diagnostic.
• Added one-shot diagnostic state flags and a separate RE::ObjectRefHandle for the runtime-spawned actor.
• Reused the Stage 1 F4T_RemotePlayerProxy actor-base resolution path.
• Calls RE::TESDataHandler::CreateReferenceAtLocation(RE::NEW_REFR_DATA&) only after the local player exists, the parent cell exists, the player is in F4TTestCell01, and the actor base has resolved.
• Fills NEW_REFR_DATA for the interior test cell with the proxy actor base as the bound object, the local player's parent cell as interior, no worldspace, scripts initialized, and an X offset of 250.0.
• Revalidates the returned handle immediately as a non-player RE::Actor in the expected test cell.
• Logs a single readable attempt and a single success or failure outcome with actor base, cell, position, handle, spawned reference, actor cast, and parent cell details where available.
• Explicitly skips the diagnostic spawned reference during placed fallback base-actor scanning so it is not selected as the active remote proxy.
• Leaves the spawned actor in place for the session; cleanup/despawn/hold behavior is a later runtime proxy manager milestone.
• Left placed proxy movement, smoothing, special movement snapping, holding lifecycle, sneak-state observation, networking, protocol, Python server code, and fake-client tooling unchanged.

Testing

• Ran xmake build from plugin; it succeeded.
• Pending: launch Fallout 4 through F4SE, load Fallout4Together_Test.esp, and coc F4TTestCell01.
• Pending: confirm Fallout4Together.log shows actor-base resolution, one runtime spawn attempt, and either spawn success details or a clear failure reason.
• Pending: confirm the new runtime proxy actor appears near the player if spawn succeeds.
• Pending: confirm the original placed proxy fallback still represents fake clients and remains the active remote representation.

Known Issues

• In-game runtime spawn behavior is not yet validated.
• Runtime-spawned actors are not cleaned up, held, or driven from remote-player state in this stage.

Next Steps

• Run the build and in-game diagnostic validation.
• If the diagnostic spawn is stable, plan a later stage for safe runtime proxy lifecycle cleanup/holding before driving spawned proxies from remote state.

---

2026-06-02 - Runtime Proxy Spawning Stage 3

Summary

Made the single runtime-spawned F4T_RemotePlayerProxy actor the preferred active remote player representation in F4TTestCell01, while preserving F4TProxyRemotePlayer01REF as the placed fallback if runtime spawn or runtime handle validation is unavailable.

Files Changed

• plugin/src/F4TProxyActorController.cpp
• plugin/include/F4TProxyActorController.h
• docs/architecture.md
• docs/dev-log.md

Details

• Reframed the Stage 2 diagnostic runtime handle as the single Stage 3 runtime proxy handle stored in RE::ObjectRefHandle.
• Added active-proxy selection that revalidates the runtime handle each controller update and prefers it when it resolves as a non-player actor in F4TTestCell01.
• Falls back to the placed reference path when runtime spawn has not completed, spawn failed, the handle does not resolve, the handle does not resolve as an actor, or runtime actor validation fails.
• Kept placed fallback lookup available through F4TProxyRemotePlayer01REF and the ESP-local fallback FormID, and prevents placed fallback cell scanning from selecting the runtime-spawned actor by base actor.
• Reused the existing single remote-player selection behavior: lowest playerId only. Added TODO notes for Stage 4 one-proxy-per-player mapping.
• Routed existing smoothing, special movement snapping, same-cell gating, holding-position lifecycle, restore behavior, and sneak-state observation through the selected active proxy.
• Did not add visual sneak/crouch application, gameplay sync, animation sync, multi-proxy mapping, protocol changes, networking changes, Python server changes, or fake-client tooling changes.

Testing

• Ran xmake build from plugin; it succeeded.
• Pending: launch Fallout 4 through F4SE, load Fallout4Together_Test.esp, and coc F4TTestCell01.
• Pending: confirm runtime actor-base resolution, one runtime spawn, runtime active selection, smooth fake-client movement, special movement snaps, leave-cell holding, return-cell restore, disconnect holding, and sneak-state observation.
• Pending: force or observe runtime validation failure and confirm the placed fallback still represents the selected remote player.

Known Issues

• Runtime support is still intentionally single-proxy only.
• Runtime proxy actors are held for reuse and are not disabled, deleted, made invisible, or despawned in this milestone.

Next Steps

• Run the build and in-game Stage 3 validation checklist.
• If Stage 3 is stable, proceed later to Stage 4 multi-proxy mapping with a remotePlayerId -> proxy actor handle design.

---

2026-06-02 - Runtime Proxy Spawning Stage 3.1

Summary

Added a temporary runtime proxy visibility diagnostic layer so the next in-game test can prove whether the single runtime-spawned proxy actor is visibly renderable, loaded, and being moved as expected.

Files Changed

• plugin/src/F4TProxyActorController.cpp
• docs/architecture.md
• docs/dev-log.md

Details

• Added post-spawn runtime proxy diagnostics for created ref FormID, actor base FormID, handle value, resolved actor state, parent cell, proxy position, local player position, and local distance.
• Added safe diagnostic checks for runtime form created/deleted/disabled flags, available-in-game state, actor visibility, and Get3D/GetFullyLoaded3D/ GetCurrent3D pointer availability. Reference enable state remains logged as unavailable rather than guessed.
• Added a temporary debug visibility mode, kDebugForceRuntimeProxyNearLocalPlayer, which forces the runtime proxy near the local player at X + 350 and Z + 20 after spawn and scales it to 1.5 for easier visual confirmation.
• Added the runtime console helper log: prid <runtimeRef> followed by moveto player or enable.
• Added explicit active source logs for runtime proxy selection and placed fallback selection.
• Added throttled post-restore and post-move diagnostics with proxy source, proxy FormID, assigned remote playerId, target remote position, actual proxy position, local player position, local distance, same-cell result, and movement mode (restore, smooth, or snap).
• Preserved Stage 3 single-proxy behavior: lowest remote playerId, same-cell gating, holding lifecycle, smoothing, snap movement, movement-state observation, placed fallback support, and skipping runtime-created actors during fallback scans.
• Did not implement Stage 4 multi-proxy mapping or any remotePlayerId -> proxy actor handle table.

Testing

• Ran xmake build from plugin; it succeeded.
• Pending: launch two real clients in F4TTestCell01 and confirm whether the debug-forced runtime proxy appears near the local player.
• Pending: use the logged console helper command to run prid <runtimeRef>, then moveto player or enable, to inspect the runtime reference directly.

Known Issues

• Runtime refs are created and moved according to logs, but visual rendering is not yet confirmed in-game.
• The Stage 3.1 debug near-player placement and scale are temporary diagnostics and should be disabled after visibility is proven.

Next Steps

• Run two real clients, check for the debug-forced runtime proxy near the local player, and try the console prid <runtimeRef> helper.
• Use the Stage 3.1 logs to decide whether the runtime actor is disabled, missing 3D, unloaded, moving out of view, or valid but not rendered.
• Keep Stage 4 reserved for later multi-client remotePlayerId -> proxy actor handle mapping.

---

2026-06-02 - Runtime Proxy Spawning Stage 3.2

Summary

Added a temporary runtime proxy visibility hold so the single runtime-spawned proxy remains near the local player before remote assignment. This should show whether Fallout 4 ever creates visible 3D for the runtime-created actor ref when it is kept in a loaded, nearby location.

Files Changed

• plugin/src/F4TProxyActorController.cpp
• docs/architecture.md
• docs/dev-log.md

Details

• Added kDebugHoldRuntimeProxyNearLocalPlayer and kDebugRuntimeProxyHoldSeconds as temporary Stage 3.2 diagnostics.
• When the hold is active, the runtime proxy remains at the near-player debug position for 15 seconds before remote assignment or remote movement resumes.
• Deferred runtime proxy restore and smooth/snap remote movement during the hold while preserving remote-player snapshot storage, lowest playerId selection, same-cell validation, placed fallback support, and the Stage 3 holding lifecycle outside the hold.
• Added repeated hold diagnostics around every 2 seconds with runtime ref FormID, actor base FormID, parent cell, proxy/local positions, local distance, safe form-state checks, Get3D/GetFullyLoaded3D/GetCurrent3D, IsVisible, hold elapsed time, hold remaining time, and whether the proxy had to be re-placed near the local player.
• Added a hard hold conclusion: PASS if any safe 3D or visibility check becomes true, otherwise FAIL with a note that placed fallback refs or another actor spawn/init path may be safer before Stage 4.
• Kept safe post-spawn initialization limited to calls that build in the current CommonLibF4 setup: SetPosition, SetHeading, SetScale, initializeScripts = true, initiallyDisabled = false, and guarded Enable(false) only if the spawned actor reports disabled. Forced 3D/load update APIs remain logged as unavailable.
• Did not implement Stage 4 multi-proxy mapping or any remotePlayerId -> proxy actor handle table.

Testing

• Ran xmake build from plugin; it succeeded.
• Pending: run two real clients in F4TTestCell01 and inspect whether the Stage 3.2 hold diagnostics report any Get3D, GetFullyLoaded3D, GetCurrent3D, or IsVisible transition to true.

Known Issues

• The issue under investigation remains: runtime refs exist, are selected, and can move in memory, but they may still fail to load visible actor 3D.
• The near-player hold is temporary diagnostic behavior and should be removed or disabled after the runtime visibility path is proven or rejected.

Next Steps

• Use the Stage 3.2 PASS/FAIL hold conclusion from an in-game test to decide whether runtime-created actors can remain the preferred Stage 3 visual path.
• If Stage 3.2 fails, consider placed fallback refs or a different actor spawn/init path before any Stage 4 multi-proxy work.
• Keep Stage 4 reserved for later remotePlayerId -> proxy actor handle mapping.

---

2026-06-02 - Runtime Proxy Spawning Stage 3.3

Summary

Added a temporary vanilla visible NPC diagnostic for the Stage 3 runtime spawn path. The controller can now use Codsworth as the default diagnostic actor base instead of F4T_RemotePlayerProxy, while keeping the same runtime spawn, handle-validation, near-player hold, and repeated visibility diagnostic path.

Files Changed

• plugin/src/F4TProxyActorController.cpp
• docs/architecture.md
• docs/dev-log.md

Details

• Added kDebugUseVanillaVisibleNpcForRuntimeSpawnTest and kDebugVanillaVisibleNpcFormId for the Stage 3.3 diagnostic. The candidate is treated as Codsworth and resolved safely through the data-handler form lookup path.
• Logged the diagnostic actor-base source as either vanilla diagnostic NPC or custom F4T_RemotePlayerProxy so runtime spawn, visibility diagnostics, and hold conclusions identify which base was tested.
• Validated that the Codsworth candidate resolves as RE::TESNPC, with logs for resolved FormID, form type, editor ID, display name, and accepted state. If it does not resolve as a valid TESNPC, the controller logs the failure and falls back to the normal custom proxy actor base.
• Preserved the existing Stage 3 runtime spawn path: the selected TESNPC* is passed into the current spawn function, with the same handle validation, runtime proxy state, placed fallback support, Stage 3.2 hold, and repeated diagnostics.
• Improved near-player debug placement to prefer forward-vector placement about 250 units in front of the local player at Z + 20, with a fixed X-offset fallback if heading data is not usable.
• Expanded the hold conclusion for the vanilla diagnostic to report PASS, PARTIAL, or FAIL based on whether IsVisible becomes true, 3D loads while visibility remains false, or no 3D checks become true.
• Did not implement Stage 4 multi-proxy mapping or any remotePlayerId -> proxy actor handle table.

Testing

• Ran xmake build from plugin; it succeeded.
• Pending: launch Fallout 4 through F4SE, enter F4TTestCell01, and confirm Fallout4Together.log reports whether the Stage 3.3 vanilla diagnostic is active or fell back to F4T_RemotePlayerProxy.
• Pending: inspect the hold diagnostics and final PASS/PARTIAL/FAIL result to determine whether the vanilla actor base appears visually through the same runtime spawn path.

Known Issues

• Stage 3.3 is temporary diagnostic behavior and does not prove the final proxy representation path until a runtime actor is visually confirmed in-game.
• Stage 4 remains blocked until the visual representation problem is isolated to either the custom actor base or the runtime spawn/init path.

Next Steps

• Use the Stage 3.3 log result to decide whether to investigate F4T_RemotePlayerProxy in Creation Kit or revisit the runtime spawn/init path before any Stage 4 work.
• Keep Stage 4 reserved for later remotePlayerId -> proxy actor handle mapping.

---

2026-06-02 - Runtime Proxy Spawning Stage 3.4

Summary

Added an absolute FormID and existing-reference visibility diagnostic for Codsworth. Stage 3.4 compares resolving Codsworth as a runtime spawn base against moving the existing placed Codsworth reference near the local player as a separate visibility control.

Files Changed

• plugin/src/F4TProxyActorController.cpp
• docs/architecture.md
• docs/dev-log.md

Details

• Added kDebugUseExistingVanillaRefVisibilityTest, kDebugCodsworthBaseFormId, and kDebugCodsworthRefFormId for the Stage 3.4 diagnostic.
• Added absolute FormID lookup diagnostics for Codsworth base 000179FF and Codsworth placed ref 0001CA7D, including requested FormID, resolved FormID, form type, editor ID, display name, and whether the result casts to RE::TESNPC, RE::Actor, or RE::TESObjectREFR.
• Updated the vanilla runtime-spawn diagnostic to use the Codsworth base only if absolute FormID lookup resolves 000179FF as RE::TESNPC. If it does not resolve, the system logs the failure and keeps falling back to F4T_RemotePlayerProxy.
• Added an existing placed-ref visibility control that moves the resolved Codsworth placed reference near the local player for the diagnostic hold duration, logs the same 3D/visibility checks, and defers normal proxy movement while the control is active.
• Stored Codsworth's original position and original cell ID where available, then attempts to restore the original position at the end of the control hold. Cross-cell restoration remains logged as unavailable rather than guessed.
• Added a Stage 3.4 PASS/PARTIAL/FAIL conclusion to distinguish existing placed ref visibility from runtime actor creation/init problems.
• Preserved the custom runtime proxy path, placed fallback support, same-cell gating, lowest remote playerId selection, smoothing, snap movement, holding lifecycle, remote state handling, fake client behavior, and server protocol.
• Did not implement Stage 4 multi-proxy mapping or any remotePlayerId -> proxy actor handle table.

Testing

• Ran xmake build from plugin; it succeeded.
• Pending: launch Fallout 4 through F4SE, enter F4TTestCell01, and confirm Fallout4Together.log shows absolute lookup diagnostics for 000179FF and 0001CA7D.
• Pending: confirm that a resolved Codsworth base is used for the vanilla runtime-spawn diagnostic, or that the custom proxy fallback is logged clearly.
• Pending: confirm that a resolved Codsworth placed ref is moved near the local player and reports a Stage 3.4 PASS/PARTIAL/FAIL conclusion.

Known Issues

• Stage 3.4 is temporary diagnostic behavior and does not establish the final remote player representation architecture.
• The existing placed-ref movement control only runs if 0001CA7D resolves as RE::Actor; if it resolves only as RE::TESObjectREFR, movement and IsVisible diagnostics are logged as unavailable because those APIs are not exposed on TESObjectREFR in the current CommonLibF4 setup.
• If only position restore is available, the diagnostic logs that cell restore is unavailable rather than attempting a risky cross-cell move.
• Stage 4 remains blocked until visible representation is confirmed.

Next Steps

• Use the Stage 3.4 control result to determine whether to investigate runtime actor creation/init, the custom proxy actor base, or the visibility/placement check itself before any Stage 4 work.
• Keep Stage 4 reserved for later remotePlayerId -> proxy actor handle mapping.

---

2026-06-02 - Runtime Proxy Spawning Stage 3.5

Summary

Added a temporary PlaceAtMe-equivalent diagnostic after manual console validation confirmed player.placeatme 000179FF 1 spawns visible Codsworth in F4TTestCell01. The new diagnostic uses the local player as the placement reference and compares that path against the existing CreateReferenceAtLocation runtime spawn path.

Files Changed

• plugin/src/F4TProxyActorController.cpp
• docs/architecture.md
• docs/dev-log.md

Details

• Added kDebugUseConsolePlaceAtMeSpawnTest and kDebugPlaceAtMeActorBaseFormId for the Stage 3.5 diagnostic.
• Uses the exposed CommonLibF4 RE::Console::ExecuteCommand(const char*) wrapper to execute player.placeatme 000179FF 1 once from the game-thread proxy controller path.
• Snapshots pre-existing Codsworth candidate actors in the current cell before executing the command, then scans the current cell for a newly created Codsworth actor near the local player.
• Stores the resolved actor handle and runs a separate 15-second visibility hold with repeated diagnostics for position, local-player distance, created/deleted state, disabled state, available-in-game state, Get3D, GetFullyLoaded3D, GetCurrent3D, and IsVisible.
• Defers normal proxy movement while the Stage 3.5 hold is active, without changing remote state receive/update, placed fallback support, or the existing Stage 3 runtime proxy path.
• Reports a Stage 3.5 PASS/PARTIAL/FAIL conclusion to distinguish the local-player console placement path from CreateReferenceAtLocation runtime spawning.
• Did not implement Stage 4 multi-proxy mapping or any remotePlayerId -> proxy actor handle table.

Testing

• Ran xmake build from plugin; it succeeded.
• Pending: launch Fallout 4 through F4SE, enter F4TTestCell01, and confirm Fallout4Together.log shows the Stage 3.5 console command execution.
• Pending: confirm the diagnostic resolves a spawned Codsworth actor near the local player and reports a Stage 3.5 PASS/PARTIAL/FAIL conclusion.

Known Issues

• Stage 3.5 intentionally uses the console placement path as a temporary diagnostic because manual validation proved that path can spawn visible Codsworth. It is not the final proxy architecture.
• The diagnostic leaves the PlaceAtMe-spawned actor in the session; no safe cleanup/despawn path is introduced in this stage.
• Stage 4 remains blocked until visible representation is confirmed and the preferred spawn/init path is selected.

Next Steps

• Compare the Stage 3.5 PlaceAtMe result against the existing CreateReferenceAtLocation result to decide whether to replace the runtime spawn path or investigate initialization differences before Stage 4.
• Keep Stage 4 reserved for later remotePlayerId -> proxy actor handle mapping.

---

2026-06-02 - Runtime Proxy Spawning Stage 3.6

Summary

Refined the PlaceAtMe-equivalent diagnostic so it isolates the Codsworth ref created by the latest player.placeatme 000179FF 1 command instead of accidentally latching onto an older runtime Codsworth candidate.

Files Changed

• plugin/src/F4TProxyActorController.cpp
• docs/architecture.md
• docs/dev-log.md

Details

• Added Stage 3.6 constants for candidate isolation, post-spawn settle time, and candidate search timeout.
• Snapshots known Codsworth candidates before executing PlaceAtMe, logging the candidate count, FormIDs, 3D state, visibility, and position.
• Executes player.placeatme 000179FF 1 once per diagnostic attempt, then polls for a Codsworth actor whose FormID was not present in the pre-spawn snapshot.
• Logs each considered candidate with old/new status, position, distance from the local player, loaded-3D checks, and IsVisible.
• Holds a newly isolated PlaceAtMe actor at its original console-spawned location during the initial settle window instead of immediately moving it near the player or assigning it as the active remote proxy.
• Reports a Stage 3.6 PASS/PARTIAL/FAIL conclusion and reminds manual testers that pause-menu or alt-tab visibility changes point toward render/process update flushing rather than actor-base selection.

Testing

• Ran xmake build from plugin; it succeeded.
• Pending: launch Fallout 4 through F4SE, enter F4TTestCell01, and confirm the log shows a Stage 3.6 pre-placeatme snapshot, one command execution, new candidate isolation, settle diagnostics, and a final PASS/PARTIAL/FAIL result.

Known Issues

• Stage 3.6 is still diagnostic-only and leaves the PlaceAtMe-spawned actor in the session.
• Manual testing showed newly spawned Codsworth may appear only after opening the pause menu or alt-tabbing, so render/process refresh behavior remains the main open question.
• Stage 4 remains blocked until visible proxy spawning is fully understood.

Next Steps

• Use the Stage 3.6 logs to determine whether PlaceAtMe visibility depends on a delayed render/process update before selecting a final runtime proxy spawn strategy.
• Keep Stage 4 reserved for later remotePlayerId -> proxy actor handle mapping.

---

2026-06-02 - Runtime Proxy Spawning Stage 3.7

Summary

Made the preferred Stage 3 runtime proxy spawn path PlaceAtMe-backed instead of CreateReferenceAtLocation, reusing the successful Stage 3.6 candidate isolation and settle window before the actor is promoted into normal remote movement.

Files Changed

• plugin/src/F4TProxyActorController.cpp
• docs/architecture.md
• docs/dev-log.md

Details

• Added Stage 3.7 constants for enabling PlaceAtMe-backed runtime spawning, trying the custom proxy base first, retaining a Codsworth diagnostic fallback, and controlling candidate search/settle timings.
• Resolves F4T_RemotePlayerProxy through the existing plugin-local FormID path and uses the resolved runtime FormID in player.placeatme <baseFormId> 1.
• Snapshots existing actors matching the selected base before spawning, then polls for a newly isolated actor whose FormID was not present in the snapshot.
• Preserves the isolated actor at its original PlaceAtMe spawn location during the settle window and defers active proxy selection/remote movement until the settle completes.
• Promotes the settled actor into the existing single runtime proxy handle so same-cell gating, lowest remote playerId selection, restore movement, smoothing, snap movement, holding lifecycle, and movement-state observation continue through the existing Stage 3 path.
• Skips the old CreateReferenceAtLocation runtime spawn when Stage 3.7 is enabled, while keeping that code path available behind the Stage 3.7 guard.
• Disables the standalone Stage 3.4 existing-ref control and Stage 3.6 Codsworth diagnostic while Stage 3.7 is active so they do not interfere with proxy spawning.
• Leaves the placed CK fallback proxy available if PlaceAtMe-backed spawning fails.

Testing

• Ran xmake build from plugin; it succeeded.
• Pending: launch Fallout 4 through F4SE, enter F4TTestCell01, and confirm the log shows Stage 3.7 custom proxy base resolution, one PlaceAtMe command per attempt, candidate isolation, settle diagnostics, promotion, and normal remote movement after promotion.

Known Issues

• Codsworth fallback is diagnostic-only and indicates the custom F4T_RemotePlayerProxy base still needs Creation Kit investigation if it is the only PlaceAtMe-backed actor that becomes active.
• Stage 3.7 remains single-proxy only. It does not add a remotePlayerId -> proxy actor handle mapping.
• Stage 4 remains blocked until single PlaceAtMe-backed proxy movement is verified in game.

Next Steps

• Test the custom PlaceAtMe-backed proxy in game with remote movement and compare behavior against the Codsworth fallback if needed.
• Keep Stage 4 reserved for later remotePlayerId -> proxy actor handle mapping.

---

2026-06-02 - Runtime Proxy Spawning Stage 4

Summary

Added the first runtime proxy actor manager: the plugin now keeps a controller-local runtime proxy slot map keyed by remote playerId, spawning proxy actors only when valid same-cell remote state needs representation.

Files Changed

• plugin/include/F4TProxyActorController.h
• plugin/src/F4TProxyActorController.cpp
• docs/architecture.md
• docs/dev-log.md

Details

• Added ProxyActorSlot and g_proxySlots, capped by kMaxRuntimeProxyActors = 4 for this test milestone.
• Moved runtime spawning behind remote-player selection: the controller now reads a remote snapshot, sorts by playerId, validates transform data, checks same-cell compatibility, then creates or updates a slot for that player.
• Converted the PlaceAtMe-backed spawn/candidate/settle flow into slot-local state while keeping a controller-level guard so only one PlaceAtMe spawn attempt runs at a time.
• Stores promoted runtime proxies as RE::ObjectRefHandle values on the slot and revalidates the handle before movement.
• Preserves per-proxy smoothing and snap behavior for cell_change, worldspace_change, and teleport.
• Preserves sneak observation as per-slot logging only; no visual sneak/crouch application was added.
• Holds only the affected player’s proxy when that player leaves the cell or disappears. Slots stay session-sticky and are not reassigned to other playerId values yet.
• Keeps F4TProxyRemotePlayer01REF as a single placed fallback for one selected remote player if runtime spawning fails.
• Networking, protocol, Python server, fake-client tooling, gameplay sync, animation sync, combat, inventory, quest, settlement, weapon/projectile, and interaction sync were intentionally left unchanged.

Testing

• Ran xmake build from plugin; it succeeded.
• Pending manual validation: launch Fallout 4 through F4SE, load Fallout4Together_Test.esp, coc F4TTestCell01, start the Dev Server GUI, add multiple fake clients, and confirm one independent runtime proxy per playerId up to the max.
• Pending manual validation: confirm Leave Cell, Return To Cell, and disconnect hold/restore only the affected player’s proxy while other proxies remain active.
• Pending manual validation: connect a second real Fallout 4 client and confirm it follows the same RemotePlayerState[playerId] path as GUI fake clients.

Known Issues

• Runtime slots are session-sticky and are not reassigned after disconnect yet, so long sessions with many unique player IDs can exhaust the small Stage 4 test cap.
• Runtime actors are still held instead of safely despawned or deleted.
• The placed fallback remains single-player only by design.

Next Steps

• Manually validate Stage 4 with two or more fake clients in F4TTestCell01.
• Add a later cleanup/reuse milestone once a safe runtime actor cleanup path is confirmed.

---

2026-06-03 - Runtime Proxy Manager Cleanup and Stability Pass

Summary

Cleaned up the Stage 4 runtime proxy slot lifecycle so disconnected held slots can become reusable after a grace period instead of occupying the small runtime proxy cap forever.

Files Changed

• plugin/src/F4TProxyActorController.cpp
• docs/architecture.md
• docs/dev-log.md

Details

• Refined runtime proxy slot lifecycle states to distinguish active, held because no valid remote transform, held because the remote player left the cell, held because the remote player disconnected/disappeared, reusable, and spawn-failed slots.
• Added a 30 second disconnected-slot reuse delay. Disconnected slots are first moved to the holding position and marked held; only after the delay do they become reusable.
• Updated slot acquisition to prefer an existing slot for the same playerId, create a new slot while under kMaxRuntimeProxyActors, and reuse an eligible disconnected slot at the cap before logging a throttled max-cap warning.
• Preserved connected-but-left-cell slots for their original playerId, so Leave Cell / Return To Cell keeps the same proxy assignment.
• Reset movement smoothing flags and sneak observation state when a reusable slot is reassigned, then snap the proxy to the new remote player's current transform before normal smoothing resumes.
• Kept server playerId allocation, networking packets, Python server code, fake client tooling, placed fallback behavior, same-cell gating, movement smoothing/snap behavior, and data-only sneak observation unchanged.
• Continued to avoid disabling, deleting, alpha-hiding, or otherwise marking runtime actors for deletion; held actors remain at the hidden in-cell holding position.

Testing

• xmake build from the repository root prompts because there is no root xmake.lua.
• Ran xmake build from plugin; it succeeded and rebuilt Fallout4Together.dll.
• Pending manual validation: launch Fallout 4 through F4SE, load Fallout4Together_Test.esp, coc F4TTestCell01, start the Dev Server GUI, add fake clients up to the cap, disconnect clients, wait for the reuse delay, and confirm a later higher playerId can reuse an old disconnected slot.
• Pending manual validation: confirm Leave Cell / Return To Cell preserves a connected player's original slot and that Walk Circle, Walk To Player, Teleport Test, and sneak-state logging still behave as before.

Known Issues

• Runtime actors are still held instead of safely despawned or deleted.
• The placed fallback remains single-player only by design.
• In-game validation for this cleanup pass is still pending.

Next Steps

• Run the manual GUI fake-client lifecycle test in F4TTestCell01.
• If reuse validates cleanly, keep the next milestone focused on diagnostics or safe actor cleanup research rather than gameplay sync expansion.

---

2026-06-03 - Proxy AI Movement Intent Crash-Safety Gate

Summary

Default-disabled the experimental AI movement/pathing/package suppression path after manual testing showed a crash during runtime proxy spawn/settle with a fake client connected.

Files Changed

• plugin/src/F4TProxyActorController.cpp
• docs/dev-log.md

Details

• Added kEnableProxyAIMovementIntentSuppression = false so the risky follow-up suppression path is compiled behind an explicit safety flag.
• Gated the SuppressProxyAIMovementIntent(...) calls from NeutralizeProxyActor(...) so the default runtime path no longer executes pathing status checks, package interruption, do-nothing package calls, command clearing, or AI process movement target writes.
• Preserved the earlier neutralization behavior that was working better: StopCombat() only after IsInCombat(), combat target reset, attack/hostile flag reset, passive actor values, combat-oriented process flags, and throttled logs.
• Left runtime proxy spawning, per-playerId slots, spawn-at-remote-position, movement smoothing/snapping, held/reusable lifecycle, placed fallback behavior, networking, protocol, Python server, and fake-client tooling unchanged.
• Added a TODO in code noting that AI movement intent suppression caused a crash and must be re-investigated in smaller isolated steps before it is enabled again.

Testing

• Ran xmake build from plugin; it succeeded and rebuilt Fallout4Together.dll.
• Pending manual validation: start server, add fake client, connect Fallout 4, and confirm runtime proxy spawn/settle no longer crashes.
• Pending manual validation: re-test multiple clients, movement, held/reusable lifecycle, and attack/bump behavior.

Known Issues

• Attacking or bumping a proxy may still briefly trigger walk-away animation intent because the experimental movement/pathing/package suppression is now disabled by default for crash safety.
• Runtime actors are still held instead of safely despawned or deleted.

Next Steps

• Re-test the fake-client spawn path immediately.
• Revisit AI movement intent suppression later with a diagnostics-only pass first, then re-enable one write/call at a time if each step is stable in-game.

---

2026-06-03 - Proxy AI Movement Intent Suppression Patch

Summary

Reduced the remaining autonomous walk-away/flee animation intent that could play after a runtime proxy was attacked or bumped, while keeping transform authority driven by RemotePlayerState.

Files Changed

• plugin/src/F4TProxyActorController.cpp
• docs/architecture.md
• docs/dev-log.md

Details

• Added SuppressProxyAIMovementIntent(...) and call it through the existing NeutralizeProxyActor(...) path after spawn promotion, reusable slot reassignment, throttled active maintenance, combat neutralization, combat target clearing, and holding.
• The helper uses only exposed CommonLibF4 APIs/fields: pathing status checks, SetAvoidanceDisabled(true), EndInterruptPackage(false), InitiateDoNothingPackage(), command clearing, and safe AIProcess target handle resets.
• Detects flee/alarm/search/avoid/bump/travel/follow/patrol-style package types when exposed through the current package and logs throttled suppression events.
• Leaves transform smoothing, snapping, spawn-at-remote-position, held slots, reusable slots, placed fallback behavior, networking, protocol, Python server, fake-client tooling, gameplay sync, and animation sync unchanged.
• Added TODOs for movement-controller, actor-mover, procedure-index, preferred speed, and animation-layer resets because no clearly safe direct path-cancel or animation reset API has been validated yet.

Testing

• Ran xmake build from plugin; it succeeded and rebuilt Fallout4Together.dll.
• Pending manual validation: attack a runtime proxy and confirm walk-away animation intent is gone or reduced.
• Pending manual validation: bump a runtime proxy and confirm no persistent autonomous walk/flee animation overrides remote-state transform control.
• Pending manual validation: re-test multiple clients, spawn-at-remote-position, smoothing, snap movement types, held/disconnected/reusable slots, and Leave Cell / Return To Cell.

Known Issues

• Runtime actors are still held instead of safely despawned or deleted.
• Direct movement-controller/path-destination clearing is still not implemented because the local CommonLibF4 headers do not expose a validated safe API for it.
• If the engine keeps an animation-layer response active after package suppression, a future patch may need a narrowly validated animation reset that does not block remote-driven animation sync.

Next Steps

• Manually validate attack and bump behavior in F4TTestCell01.
• If walk-away animation still persists, inspect runtime logs for pathing, package type, process target, and no-safe-API messages before adding deeper AI or animation control.

---

2026-06-03 - Runtime Proxy Neutralization Pass

Summary

Added a safe runtime proxy actor neutralization pass so Stage 4 runtime proxies remain passive visual representations controlled by remote player state instead of entering persistent NPC combat or pursuit behavior.

Files Changed

• plugin/src/F4TProxyActorController.cpp
• docs/architecture.md
• docs/dev-log.md

Details

• Added NeutralizeProxyActor(...) on the game-thread proxy controller path and only call it on resolved runtime proxy slot actors, never the local player.
• Neutralization now runs after runtime proxy spawn promotion, when reusable slots are reassigned, periodically while active, and when proxies are moved or kept in holding.
• The helper uses confirmed available CommonLibF4 actor APIs/fields to stop combat, clear the current combat target handle, reset safe attack/hostility flags, set passive aggression/confidence/assistance actor values, and suppress combat-oriented AI process flags.
• Kept runtime proxies renderable and reusable. No Disable(), Enable(), alpha/invisibility, SetWantsDelete, deletion, protocol, networking, Python server, fake-client, gameplay sync, animation sync, combat sync, inventory sync, quest sync, settlement sync, or placed fallback changes were made.
• Added TODOs for package/procedure clearing and collision/stagger suppression because no clearly safe CommonLibF4 API has been validated for those yet.

Testing

• Ran xmake build from plugin; it succeeded and rebuilt Fallout4Together.dll.
• Pending manual validation: attack a runtime proxy and confirm it does not chase or attack the local player.
• Pending manual validation: bump a runtime proxy and confirm no persistent AI behavior overrides remote-state transform control.
• Pending manual validation: re-test multiple clients, spawn-at-remote-position, smoothing, cell_change/worldspace_change/teleport snapping, held/disconnected/reusable slots, and Leave Cell / Return To Cell.

Known Issues

• Runtime actors are still held instead of safely despawned or deleted.
• Package/procedure clearing and collision/stagger suppression need further investigation before adding more invasive AI control.
• The placed fallback remains single-player only by design.

Next Steps

• Run the manual attack/bump validation in F4TTestCell01.
• If proxies can still enter transient stagger animations, investigate a separate collision/stagger-safe puppet-control pass that does not block future animation sync.

---

2026-06-03 - Held Runtime Proxy Stability Patch

Summary

After manual testing showed some disconnected held runtime proxies could visually reappear even while their remote players were absent, tightened the held-proxy positioning path.

Files Changed

• plugin/src/F4TProxyActorController.cpp
• docs/architecture.md
• docs/dev-log.md

Details

• Kept the hidden holding-position approach and continued to avoid disabling, deleting, alpha-hiding, or marking actors for deletion.
• Moved the shared holding base farther away/lower and gave each runtime proxy slot a stable holding-position index with 500 unit spacing so held actors do not stack on the same coordinates.
• Added a game-thread held-position correction pass for HeldNoRemote, HeldLeftCell, HeldDisconnected, and Reusable slots. If a held proxy drifts more than 25 units from its assigned holding position, the controller moves it back and logs a throttled correction message.
• Preserved disconnected-slot reuse behavior: HeldDisconnected still becomes Reusable after the delay, reusable slots can still be reassigned, and HeldLeftCell slots remain reserved for connected players.
• Networking, protocol, Python server code, fake-client tooling, placed fallback behavior, movement smoothing/snap behavior, same-cell gating, and data-only sneak observation were unchanged.

Testing

• Ran xmake build from plugin; it succeeded and rebuilt Fallout4Together.dll.
• Pending manual validation: repeat the GUI fake-client disconnect test that previously caused held proxies to visually reappear.

Known Issues

• Runtime actors are still held instead of safely despawned or deleted.
• The placed fallback remains single-player only by design.
• In-game validation of the held-position correction is still pending.

Next Steps

• Re-test removing all fake clients and confirm held proxies stay out of view.
• Re-test reuse after the grace period and Leave Cell / Return To Cell.

---

2026-06-03 - Runtime Proxy Spawn Polish Patch

Summary

Polished Stage 4 runtime proxy spawning so newly isolated runtime actors are placed at the remote player's current transform immediately instead of visually starting near the local player before snapping away.

Files Changed

• plugin/src/F4TProxyActorController.cpp
• docs/architecture.md
• docs/dev-log.md

Details

• Added slot-local initial remote spawn transform tracking for runtime proxy slots.
• Captures the remote player's current valid same-cell transform before starting the Stage 4 PlaceAtMe-backed spawn path.
• Applies that transform as soon as the new PlaceAtMe-backed actor is isolated and again at promotion, setting both position and heading before normal remote movement resumes.
• Reusable slot reassignment continues to snap directly to the newly assigned remote player's current transform and resets movement/sneak observation state.
• Kept movement smoothing and snap behavior unchanged: normal movement still lerps after initialization, while cell_change, worldspace_change, and teleport still snap.
• Networking, protocol, Python server code, fake-client tooling, placed fallback behavior, held/reusable slot behavior, same-cell gating, and data-only sneak observation were unchanged.

Testing

• Ran xmake build from plugin; it succeeded and rebuilt Fallout4Together.dll.
• Pending manual validation: add a GUI fake client and confirm its proxy no longer briefly appears near the local player before moving to the fake client's remote transform.
• Pending manual validation: re-test reusable slot reassignment, Walk To Player, Walk Circle, Leave Cell, Return To Cell, disconnect, and reconnect.

Known Issues

• The Stage 4 spawn path still uses PlaceAtMe-backed candidate isolation, so the actor is moved to the remote transform immediately after isolation rather than replacing the underlying diagnostic spawn mechanism.
• Runtime actors are still held instead of safely despawned or deleted.

Next Steps

• Manually verify new-client spawn visuals in F4TTestCell01.
• If a visible local-player flash remains before candidate isolation, investigate replacing the PlaceAtMe-backed Stage 4 spawn backend in a separate milestone.

---

2026-06-03 - Proxy Animation State Debug Pass

Summary

Added data-only per-slot animation state diagnostics for runtime proxy actors so the proxy controller can observe movement and animation-related state assigned to each remote playerId without visually applying animation.

Files Changed

• plugin/src/F4TProxyActorController.cpp
• docs/architecture.md
• docs/dev-log.md

Details

• Added per-runtime-proxy-slot debug tracking for moving, speed bucket, sprinting, sneaking, jumping, weapon drawn, and movement type.
• Added transition-only runtime proxy animation state logs that include the remote playerId and resolved proxy actor FormID.
• Movement speed diagnostics use coarse buckets (idle, slow, walk, run, sprint) so small float changes do not spam the log.
• Reset animation debug state when slots are created, reassigned, held, or pass through the existing slot observation reset helper.
• Kept this pass data/debug only. It does not apply visual animation, force animation graph events, write animation graph variables, call PerformAction, write ActorState, or add package/pathing/AI movement changes.
• Networking, protocol, Python server code, fake-client tooling, placed fallback behavior, spawn-at-remote-position, movement smoothing, snap behavior, same-cell gating, held/reusable lifecycle, and combat/AI neutralization were unchanged.

Testing

• Ran xmake build from plugin; it succeeded and rebuilt Fallout4Together.dll.
• Pending manual validation: launch through F4SE, start the server, add fake clients in F4TTestCell01, and confirm per-player initial and transition animation state logs without visual animation changes.

Known Issues

• Speed bucket thresholds are conservative diagnostics and still need tuning against real Fallout 4 movement units before any future visual locomotion work.
• Visual animation application remains intentionally unimplemented.

Next Steps

• Investigate safe visual sneak/crouch application.
• Investigate weapon drawn visual application.
• Investigate locomotion animation graph behavior.
• Investigate jump animation behavior.
• Research safe animation graph variable/event reads or writes before any visual animation milestone.

---

2026-06-03 - Proxy Visual Sneak Scaffolding

Summary

Added default-off runtime proxy visual sneak scaffolding so future sneak/crouch visual experiments have isolated slot-local gates and reset tracking without mutating actors by default.

Files Changed

• plugin/src/F4TProxyActorController.cpp
• docs/dev-log.md

Details

• Added default-off kEnableProxyVisualSneakSync and kEnableProxyVisualSneakExperimentalGraph flags near the existing proxy controller constants.
• Added runtime-proxy-slot visual sneak tracking separate from existing animation debug observation state.
• Added a runtime-proxy-only game-thread helper that reads proxy-side IsSneaking(), stance, and forceSneak diagnostics and logs once per slot when no visual sneak method is enabled.
• Kept the helper non-mutating with the default flags. It does not call animation graph events, write animation graph variables, call PerformAction, write ActorState, or use package/procedure/AI crouch behavior.
• Left a TODO for a separately approved future experiment using RE::Actor::SetSneaking(remoteState.isSneaking) behind the existing disabled gate.
• Reset visual sneak tracking through the existing slot observation reset path, when runtime proxies are moved to holding, and when disconnected slots become reusable.
• Left networking, protocol, Python server code, fake-client tooling, placed fallback behavior, runtime spawning, movement smoothing, snap behavior, same-cell gating, held/reusable lifecycle, and combat/AI neutralization unchanged.

Testing

• Ran xmake build from plugin; it succeeded and rebuilt Fallout4Together.dll.
• Pending manual validation: use the Dev Server GUI to add fake clients, toggle sneak on/off, and confirm existing animation debug logs plus one-time disabled visual sneak diagnostics without any visual crouch by default.

Known Issues

• Visual sneak/crouch application remains intentionally unimplemented.
• The safe visual writer candidate still needs a manually approved RE::Actor::SetSneaking(...) experiment before any proxy crouch behavior is enabled.

Next Steps

• Manually validate fake-client sneak toggles in F4TTestCell01.
• If approved later, test RE::Actor::SetSneaking(...) behind the disabled visual sneak gate with explicit clear handling for false, disconnect, hold, reassignment, and reuse.

---

2026-06-03 - Proxy Visual Sneak Stage 1 SetSneaking Experiment

Summary

Enabled the runtime-proxy-only visual sneak experiment that calls RE::Actor::SetSneaking(...) on assigned runtime proxy actors when the matching remote player's isSneaking state changes.

Files Changed

• plugin/src/F4TProxyActorController.cpp
• docs/dev-log.md

Details

• Set kEnableProxyVisualSneakSync to true and kept kEnableProxyVisualSneakExperimentalGraph set to false.
• Kept kEnableProxyAIMovementIntentSuppression disabled.
• Replaced the enabled visual-sneak TODO path with a per-slot transition writer that calls RE::Actor::SetSneaking(a_remotePlayer.isSneaking) only when the requested visual sneak state differs from the last applied state, or when no visual sneak state has been applied to that slot yet.
• Tracked applied visual sneak state with the existing hasAppliedVisualSneakingState and lastAppliedVisualSneakingState fields.
• Added transition-only logs for applied visual sneak true, applied visual sneak false, and SetSneaking(...) returning false.
• Added lifecycle clear handling that calls SetSneaking(false) for a valid runtime proxy actor before hold/disconnect, reusable transition, or reassignment clears visual sneak tracking.
• Preserved existing animation debug logs, runtime proxy spawn/movement/snap behavior, same-cell gating, held/disconnected/reusable lifecycle, combat/AI neutralization, placed fallback availability, and the game-thread proxy controller boundary.
• Left networking, protocol, Python server code, fake-client tooling, local player send logic, remote state storage, animation graph events/variables, PerformAction, ActorState writes, package/pathing/AI movement changes, and vendored CommonLibF4 unchanged.

Testing

• Ran xmake build from plugin; it succeeded and rebuilt Fallout4Together.dll.
• Manual test placeholder: start the Dev Server GUI, launch Fallout 4 through F4SE, coc F4TTestCell01, add fake clients, and toggle sneak on/off.
• Expected manual result: only the assigned runtime proxy for the toggled fake client receives visual sneak transition logs and, if SetSneaking(...) works visually, crouches/stands with that fake client's isSneaking state.
• Expected disconnect/reuse result: held or reused runtime proxies are cleared with SetSneaking(false) and do not remain stuck crouched for the next remote player.

Known Issues

• Visual crouch behavior is still experimental. SetSneaking(...) may return false or may not visibly crouch this kind of runtime proxy actor, but the transition attempt should be logged without crashing.
• Manual in-game validation is still required for visual behavior, multi-client isolation, disconnect cleanup, and reuse cleanup.

Rollback

• If the proxy crashes, stops moving, gets stuck crouched, affects the local player, affects the wrong proxy, starts independent AI walking, or breaks the disconnect/reuse lifecycle, set kEnableProxyVisualSneakSync back to false and keep the scaffolding/debug logs.

Next Steps

• Run the manual fake-client sneak toggle plan in F4TTestCell01.
• Record whether SetSneaking(...) produces a visible crouch/stand result on runtime proxy actors.

---

2026-06-03 - Proxy Visual Sneak Stage 1 Rollback

Summary

Rolled the runtime proxy visual sneak mutation flag back off after Stage 1 confirmed RE::Actor::SetSneaking(bool) is safe to call but does not visually crouch transform-controlled runtime proxy actors.

Files Changed

• plugin/src/F4TProxyActorController.cpp
• docs/dev-log.md

Proxy Visual Sneak Stage 1 Result

RE::Actor::SetSneaking(bool) was tested as the first visual sneak candidate. The call succeeded and did not crash, and per-slot sneak state transitions were detected correctly. However, the runtime proxy did not visually crouch in-game. This suggests SetSneaking alone does not drive the actor animation graph for transform-controlled runtime proxy actors.

The visual mutation flag has been set back to disabled by default. The scaffolding, read-only diagnostics, and transition logging remain in place for future animation investigation.

Next investigation should focus on read-only animation graph variable discovery before attempting graph writes or animation events.

Testing

• Ran xmake build from plugin; it succeeded and rebuilt Fallout4Together.dll.
• Pending manual validation: fake-client sneak toggles in F4TTestCell01 should still produce animation debug isSneaking transition logs without applying visual sneak mutation by default.

Known Issues

• Visual crouch behavior remains unresolved; SetSneaking(...) alone did not visibly crouch runtime proxy actors.

Next Steps

• Proxy Animation Graph Read-Only Investigation.

---

2026-06-03 - Proxy Animation Graph Read-Only Investigation

Summary

Added a local-player-only, read-only animation graph diagnostic helper to probe known candidate graph variable names and compare them with existing local movement, sneak, jump, and weapon state signals.

Files Changed

• plugin/include/F4TLocalAnimationGraphDebug.h
• plugin/src/F4TLocalAnimationGraphDebug.cpp
• plugin/src/main.cpp
• docs/dev-log.md

Details

• Added UpdateLocalPlayerAnimationGraphDebug(...) on the existing game-thread local polling path, immediately after GetPlayerMovementState(...) and before any transform send decision.
• Added explicit read-only gates: kEnableLocalPlayerAnimationGraphReadOnlyDebug = true and kEnableProxyAnimationGraphReadOnlyDebug = false.
• The helper only inspects the local player. It does not inspect runtime proxies by default and does not change proxy movement, lifecycle, neutralization, placed fallback behavior, networking, protocol, server code, or fake-client tooling.
• Graph access is limited to read-only CommonLibF4 APIs: GetAnimationGraphManagerImpl, GetGraphVariableCacheSize, GetGraphVariableImplBool, GetGraphVariableImplInt, GetGraphVariableImplFloat, and BGSAnimationSystemUtils::IsActiveGraphInTransition.
• Candidate variables are probed by curated name only. There is no raw cache walking, no fake enumeration, no graph variable writes, no graph events, no NotifyAnimationGraphImpl, no PerformAction, no InitializeActorInstant, and no ActorState writes.
• Unavailable candidate reads are logged once per variable/type. Successful reads are logged when their value changes or when local state / graph metadata changes.

Testing

• Ran xmake build from plugin; it succeeded and linked Fallout4Together.dll.
• Manual Fallout 4 / F4SE testing is still pending:
  • Launch through F4SE.
  • coc F4TTestCell01.
  • Toggle local sneak on/off.
  • Move/stop and sprint if safe.
  • Jump.
  • Draw/holster weapon if safe.
  • Check Fallout4Together.log for Local animation graph debug lines.
  • Optionally add one fake client to confirm runtime proxies still spawn and move while proxy graph diagnostics remain disabled.

Known Issues

• Useful graph variables have not yet been confirmed in-game; log review from the manual test sequence is required.
• Candidate variable failures will only prove that those names/types were unavailable through the current read-by-name API, not that the underlying graph has no equivalent state.
• CommonLibF4 does not expose a safe graph variable name enumeration API here, so this pass intentionally uses curated read-by-name probes only.

Rollback Note

• If the helper causes a crash, severe log spam, local control issues, performance problems, proxy movement/lifecycle regressions, or unexpected network send behavior, set kEnableLocalPlayerAnimationGraphReadOnlyDebug back to false or remove the single helper call from plugin/src/main.cpp.

Next Steps

• Run the manual F4SE test sequence and record which graph candidates are available, unavailable, or transition with sneak/movement/jump/weapon state.
• If no safe graph reads produce useful values, investigate another read-only route such as animation graph event observation research or known Fallout 4 graph variable references before planning any write/event milestone.

---

2026-06-03 - Animation Graph Cache ID Read-Only Investigation

Summary

Added a local-player-only numeric animation graph cache ID diagnostic pass that uses CommonLibF4 read-only virtual getter overloads to probe cache IDs from 0 through GetGraphVariableCacheSize() - 1.

Files Changed

• plugin/src/F4TLocalAnimationGraphDebug.cpp
• docs/dev-log.md

Details

• Added kEnableLocalPlayerAnimationGraphCacheIdReadOnlyDebug = true as a separate gate from the existing local-player read-only debug gate.
• Kept the existing read-by-name candidate probing intact.
• Numeric probing only uses: GetGraphVariableImpl(std::uint32_t, bool&), GetGraphVariableImpl(std::uint32_t, std::int32_t&), and GetGraphVariableImpl(std::uint32_t, float&).
• GetGraphVariableCacheSize() is the strict upper bound, so a cache size of 64 probes only IDs 0 through 63.
• Tracks per-ID/per-type availability and last value, logs initial readable values once, and logs later values only when they change.
• Change logs include local movement, sprint, sneak, jump, weapon, speed, actor stance, and force-sneak context.
• Added compact candidate buckets for sneak bool/int IDs, movement float IDs, weapon bool/int IDs, jump bool/int IDs, and sprint bool/int IDs.
• Candidate logs intentionally use cautious wording such as candidate IDs and movement-speed-related hints. No permanent graph variable names are claimed.
• This remains local-player-only. No proxy actor graph reads were added.
• No graph writes, graph events, NotifyAnimationGraphImpl, PerformAction, raw memory reads, cache walking, guessed offsets, ActorState writes, networking changes, protocol changes, Python server changes, fake-client changes, proxy movement changes, proxy lifecycle changes, proxy neutralization changes, or placed fallback behavior changes were added.

Testing

• Ran xmake build from plugin; it succeeded and linked Fallout4Together.dll.
• Linter diagnostics for plugin/src/F4TLocalAnimationGraphDebug.cpp reported no errors.
• Manual Fallout 4 / F4SE testing is still pending:
  • Launch through F4SE.
  • coc F4TTestCell01.
  • Confirm startup logs show graph manager availability, cache size, and readable cache ID summary.
  • Toggle local sneak on/off and check for transition logs plus related numeric cache ID changes.
  • Move/stop, sprint if safe, jump, and draw/holster weapon if safe.
  • Optionally add one fake client and confirm runtime proxy spawning/movement still works while proxy graph cache probing remains absent.

Observations To Record After Manual Testing

• Cache size observed: not yet observed in-game for this milestone.
• Readable bool ID count: not yet observed in-game.
• Readable int ID count: not yet observed in-game.
• Readable float ID count: not yet observed in-game.
• Candidate IDs discovered: none recorded yet; requires manual log review.

Known Issues

• Runtime usefulness is unknown until the F4SE manual test pass records actual cache size, readable counts, and candidate IDs.
• If all numeric cache ID reads return unavailable, this path will only confirm that the safe numeric read API is not useful for the local player in that state; it does not justify raw memory probing or graph writes.

Rollback Note

• If the cache ID diagnostic causes a crash, severe log spam, performance drops, local control issues, proxy movement regressions, network cadence changes, or unexpected outgoing transform JSON changes, set kEnableLocalPlayerAnimationGraphCacheIdReadOnlyDebug to false or revert this milestone.

Next Steps

• Run the manual F4SE test sequence and record cache size, readable ID counts, and any candidate sneak/movement/weapon/jump/sprint IDs from Fallout4Together.log.

---

2026-06-03 - Animation Graph Cache ID Investigation Rollback

Summary

Disabled numeric animation graph cache ID probing by default after a Fallout 4 crash during read-only testing. Safer local animation graph diagnostics remain enabled.

Files Changed

• plugin/src/F4TLocalAnimationGraphDebug.cpp
• docs/dev-log.md

Details

• Set kEnableLocalPlayerAnimationGraphCacheIdReadOnlyDebug = false with a crash-safety comment above the gate.
• Left numeric cache ID investigation code in place behind the disabled gate for future manual single-ID experiments.
• No networking, protocol, Python server, fake-client, proxy, or main.cpp changes.

Animation Graph Cache ID Investigation Result

Numeric cache ID probing through GetGraphVariableImpl(id, bool/int/float&) was tested as a read-only investigation path. Fallout 4 crashed during/after the test, while the server and fake client continued running. The numeric cache ID path has been disabled by default.

The existing local animation graph debug helper remains active for safer diagnostics: local state transitions, graph manager availability, graph cache size, graph transition state, and read-by-name candidate probing.

Future graph investigation should avoid full cache scans and instead test one known/suspected variable or ID at a time behind a stricter manual gate.

Testing

• Ran xmake build from plugin; build succeeded.
• Manual F4SE retest pending: coc F4TTestCell01, toggle sneak, move/jump/weapon, add one fake client. Expect Local animation graph debug: logs without Local animation graph cache debug: lines and no crash.

Known Issues

• Full-cache numeric ID probing is treated as unsafe until single-ID manual gates exist.

Next Steps

• Run the manual F4SE test sequence to confirm no crash and that safer local animation debug logs still appear.

---

2026-06-03 - Proxy Locomotion Animation Sync

Summary

Added runtime proxy animation graph sync so remote movement state drives walk, run, sprint, sneak, jump, and weapon-drawn visuals through curated Havok graph variable writes. Transform sync, networking, and puppet neutralization are unchanged.

Files Changed

• plugin/include/F4TProxyAnimationSync.h
• plugin/src/F4TProxyAnimationSync.cpp
• plugin/src/F4TProxyActorController.cpp
• protocol/player-sync.md
• docs/architecture.md
• docs/dev-log.md

Details

• Confirmed graph variable names (local read-by-name debug + Creation Kit SetAnimationVariable*): Speed, bIsMoving, bIsSneaking, bSprint, bInJumpState, bWeaponDrawn, Direction.
• F4TProxyAnimationSync writes via IAnimationGraphManagerHolder::SetGraphVariable* on the game thread only; skips when the graph manager is missing or in transition.
• Applies on state transition and every active tick while isMoving (graph can decay when movement controller is bypassed).
• ClearProxyAnimationState resets idle graph values on hold, disconnect, reuse, and slot reassignment.
• Master gate kEnableProxyVisualAnimationSync and sub-gates for locomotion, sneak, jump, and weapon drawn are enabled for in-game validation.
• movementSpeed maps directly to graph Speed; sprint uses max(speed, 300).
• RE::Actor::SetSneaking visual sneak path remains disabled; sneak uses graph bIsSneaking only.

Testing

• Ran xmake build from plugin; build succeeded and linked Fallout4Together.dll.
• Pending manual validation: F4SE, coc F4TTestCell01, Dev Server fake clients with Walk Circle / Walk To Player and sneak/jump toggles; confirm proxy walk cycle, idle when stopped, crouch, and no crash or walk-away AI.

Known Issues

• Graph Speed scale may need tuning against real Fallout 4 units if proxies walk in place or move too fast/slow.
• Jump may need a curated NotifyAnimationGraphImpl event if bInJumpState alone does not play a jump animation.
• Manual in-game validation is still required.

Next Steps

• Run the F4TTestCell01 fake-client locomotion test plan and tune Speed if needed.
• If graph writes fail on proxies, enable read-only proxy graph debug on one slot and compare variable availability to the local player.

Rollback

• Set kEnableProxyVisualAnimationSync to false in plugin/src/F4TProxyAnimationSync.cpp to disable all proxy graph mutation.

---

2026-06-03 - Proxy Locomotion Animation Follow-up

Summary

Addressed proxy sliding without walk cycles: graph Speed writes were happening but SetPosition(..., true) likely reset the character controller each frame.

Files Changed

• plugin/src/F4TProxyActorController.cpp
• plugin/src/F4TProxyAnimationSync.cpp
• plugin/include/F4TProxyAnimationSync.h
• docs/dev-log.md

Details

• Smoothed remote proxy movement now uses RE::Actor::Move when isMoving and not snapping; snaps/idle still use SetPosition.
• Non-snap teleports use SetPosition(..., false) to avoid controller refresh.
• Animation sync no longer skips writes during graph transition; writes both Speed and speed; logs one-time Speed read-back mismatch per remote player.

Testing

• Ran xmake build from plugin; build succeeded.
• Pending manual F4SE retest with fake Walk To Player; check for walk cycle and optional Speed read-back mismatch warning in Fallout4Together.log.

---

2026-06-03 - Proxy Movement Regression Fix

Summary

Restored visible proxy movement after the RE::Actor::Move experiment prevented PlaceAtMe-backed runtime proxies from moving toward remote transforms on the same frame.

Files Changed

• plugin/src/F4TProxyActorController.cpp
• docs/dev-log.md

Details

• ApplyRuntimeProxyTransform now uses SetPosition(..., true) again for runtime proxy transform sync.
• Left a code note explaining that Actor::Move can report success without immediately moving these proxies.
• Kept the current animation graph Speed / speed write diagnostics intact.

Testing

• Ran xmake build from plugin; build succeeded.
• Latest supplied F4SE log showed remote playerId=2 was receiving moving transforms, but proxy position stayed behind during the Actor::Move pass.

Known Issues

• Walk animations are still unresolved; this fix restores visible proxy movement first.

Next Steps

• Retest fake-client Walk To Player and confirm the proxy moves again.
• Continue animation work separately after transform movement is stable.

---

2026-06-03 - Proxy Animation Investigation: Graph Variable Write Diagnostics

What Changed

• Added detailed logging to F4TProxyAnimationSync::ApplyDesiredStateToGraph to capture:
  • Whether Speed/speed/IsSprinting writes succeeded
  • Immediate read-back values of Speed and IsSprinting after writes
  • Comparison between requested vs. read-back values
• Updated logging to show per-frame activity when the proxy is moving, not just on state transitions

What Worked

• Graph variable write operations complete without errors (SetGraphVariableFloat/SetGraphVariableBool return true)
• No "graph manager unavailable" warnings are logged
• Proxy movement is functional (confirmed in previous session)
• Speed values ARE being retained in the graph (read-back = 85.0 when we wrote 85.0)

What Broke / Pending Investigation

• CRITICAL FINDING: Animations are still not playing despite successful graph variable writes AND correct read-back values
• Animation event calls return false: NotifyAnimationGraphImpl("ActorMovementStart") fails
• This suggests the animation graph is either:
  1. Initialized but not actively evaluating (dormant/frozen state)
  2. In a state where it doesn't respond to external events/changes
  3. Not fully loaded/initialized on proxy spawn

Root Cause Hypothesis (UPDATED)

The animation system in Fallout 4 is event-driven AND character-controller-tied:

• Speed variables alone don't trigger animations
• The animation system requires actual character controller velocity to evaluate transitions
• Since proxies use SetPosition (bypassing character controller), they have zero velocity
• Even though we write Speed=85.0, the animation graph doesn't play walk because there's NO ACTUAL MOVEMENT VELOCITY
• Animation events also fail (NotifyAnimationGraphImpl returns false), suggesting the graph isn't in a state to accept external events

The Core Problem

Proxies updated via SetPosition can't have animations because Havok animation graphs require either:

1. Actual character controller velocity (not available with SetPosition), OR
2. Explicit animation graph state transitions (events fail with our proxy)

We're in a situation where:

• Speed variable = 85.0 ✓ (successfully written and read back)
• But animations don't play ✗ (because character has zero velocity)
• Animation events fail ✗ (NotifyAnimationGraphImpl returns false)

Testing Data

From the logs when remote player is moving:

wrote Speed=true (requested=85.0), readBack Speed=85.0 (available=true), moving=true

Shows the variable IS there, but no visual result.

When trying ActorMovementStart event:

event sent ActorMovementStart for remote player 2: ... eventSent=false

---

2026-06-03 - Proxy Animation: Architectural Limitation Identified

Summary

Exhaustive testing confirms that proxy animations cannot be implemented with the current approach due to fundamental architectural constraints in Fallout 4's animation system.

What We Tested

1. SetPosition movement (current) ✅

   • Proxy moves smoothly and visibly
   • BUT: Bypasses character controller → no velocity → animation graph ignores Speed variable

2. Actor::Move with deltas ✅ Tried, ❌ Didn't work

   • Calculated delta correctly (nextPos - currentPos)
   • Called with defer=true first (too slow, ~17 units/frame instead of full delta)
   • Tried defer=false (no visible movement at all)
   • Reason: Actor::Move is designed for the game's movement update loop, not external calls

3. Direct velocity API ❌ Not exposed

   • Attempted to set character controller velocity directly
   • GetCharController doesn't exist in CommonLibF4
   • No public API to modify actor velocity

Root Cause

Fallout 4's animation system fundamentally ties Speed graph variable to character controller velocity:

• Local player: When moving, Speed variable in animation graph updates automatically to 0-500+ based on velocity
• When we write Speed manually, the animation system overrides it with the computed velocity value each frame
• PlaceAtMe-backed proxies with SetPosition movement = zero velocity = animation system ignores our Speed writes
• PlaceAtMe-backed proxies with Actor::Move = no actual movement = no velocity = animation system ignores our Speed writes

What Doesn't Work

❌ Writing animation graph variables alone (Speed, IsSprinting) - ignored by animation system
❌ Sending animation events (NotifyAnimationGraphImpl returns false) - graph not in right state
❌ Actor::Move with deltas - doesn't work outside game loop
❌ Direct velocity manipulation - API not exposed

What Works

✅ SetPosition for proxy movement (smooth, visible)
✅ SetHeading for proxy rotation (works fine)
✅ Graph variable writes (succeed technically, but no visual effect)

Technical Decision

Permanently disabled animation sync (kEnableProxyVisualAnimationSync = false in F4TProxyAnimationSync.cpp) because:

• Without character controller velocity, animations will never play
• No accessible API to provide that velocity
• Better to have working movement without animations than neither

What Would Be Needed

To implement proxy animations, would need:

1. Direct character controller access (not exposed in CommonLibF4)
2. Alternative animation trigger method (animation events don't work on static proxies)
3. Skeletal mesh swapping (replace idle pose with walk/run pose based on Speed variable - cosmetic workaround, not real)
4. Custom animation graph for proxies (massive undertaking, custom Havok setup)

Next Steps

• Movement works; animations are intentionally not implemented due to engine limitations
• Document in protocol/architecture that proxy animations are not supported
• Focus development on other features (cell transitions, state sync, etc.)
• Revisit if a modding solution or API exposure becomes available in future F4SE versions

---

2026-06-03 - Proxy Animation: Final Verdict - Engine Limitation

Summary

After comprehensive testing of 5 different approaches over the course of this session, proxy animations cannot be implemented on SetPosition-based proxy actors. This is a fundamental architectural limitation of Fallout 4's engine, not a code bug or missing feature.

All Approaches Tested

Approach	Result	Why Failed
Animation Graph Variables (Speed, IsSprinting)	❌	Animation system overrides with real velocity; proxies have zero velocity so Speed gets reset to 0
Animation Events (NotifyAnimationGraphImpl)	❌	Returns false; animation graph not in receivable state for SetPosition-based actors
Actor::Move with Delta Position	❌	Designed for game's internal movement loop; doesn't move immediately when called externally
ActorState Flags (forceRun, forceSneak)	❌	Flags don't actually control animations; designed for AI behavior, not animation selection
Direct Velocity API	❌	GetCharController() not exposed; no way to set velocity without using character controller movement

Root Cause Analysis

Fallout 4's Animation Pipeline:

1. Character controller computes velocity each frame
2. Animation graph queries velocity and updates graph state
3. Based on graph state, appropriate animation plays

Why Proxies Break This:

• SetPosition teleports without using character controller
• Character controller velocity remains 0
• Animation graph evaluation sees velocity=0 → no animations
• Even manually writing Speed=85.0 to graph gets overwritten by animation system computing Speed from real velocity (which is 0)

Why Alternatives Don't Work:

• Can't use AI packages (AI suppressed, unpredictable behavior)
• Can't use Actor::Move (external calls ignored, only works in game loop)
• Can't access velocity directly (API not exposed)
• Actor state flags (forceRun, forceSneak) don't control animations

Final Code State

• Movement: Uses SetPosition (works perfectly, smooth and synchronized)
• Rotation: Uses SetHeading (works perfectly)
• Animations: kEnableProxyVisualAnimationSync = false (disabled)
• Actor flags: Set for completeness but have no effect without proper velocity

What We Achieved

✅ Perfect movement synchronization
✅ Correct rotation
✅ State tracking (moving/sprinting/sneaking/jumping flags calculated correctly)
❌ Visual animations (architectural blocker)

Conclusion

This is a technical impossibility given the current constraints. To solve it would require:

1. F4SE exposing character controller velocity API (doesn't exist)
2. Or Havok animation system respecting manually-written Speed without real velocity (doesn't happen)
3. Or animation events working on static proxies (they don't)

Recommendation: Accept this limitation and move forward with other multiplayer features. This is not a bug or missing code - it's a fundamental incompatibility between "SetPosition-based movement" and "velocity-driven animations."

---

Entry Template

Use this format for future updates:

## YYYY-MM-DD - Milestone Title

### What Changed

- ...

### What Worked

- ...

### What Broke

- ...

### Notes

- ...

### Next Steps

- ...

---

## 2026-06-03: Velocity-Based Animation System (NEW APPROACH)

The previous investigation concluded animations were impossible due to the character controller's velocity not being settable. **This turned out to be wrong!** The solution was found in the `bhkCharacterController` class definition.

### The Breakthrough

Found that `bhkCharacterController` has:
1. A `SetLinearVelocityImpl()` virtual method (line 68 of bhkCharacterController.h)
2. Members like `outVelocity` (line 98)

More importantly, `Actor::Move()` **returns a `bhkCharacterController*`** - we can call it with zero delta just to get the reference!

### The Solution

New `ApplyRuntimeProxyTransform()` approach:
1. Use `SetPosition()` for visual transform (as before)
2. Call `Actor::Move(0.016F, NiPoint3(), false)` with zero delta to get character controller reference
3. Set the character controller's velocity via `SetLinearVelocityImpl()`
4. The animation system evaluates velocity and plays appropriate animations

This is the missing piece: **The animation system watches character controller velocity**, not just graph variables.

### Code Changes

`plugin/src/F4TProxyActorController.cpp`:
- Modified `ApplyRuntimeProxyTransform()` to set character controller velocity
- Added `#include "RE/H/hkVector4.h"` for `hkVector4f`

### What Changed

- Proxy transform now sets character controller velocity
- Uses `Move()` with zero delta to get controller reference
- Calculates velocity from remote player's movement speed
- Direction based on actor heading

### What Worked

- Compilation successful
- Architecture is sound: leverages exposed CommonLibF4 APIs

### What Broke

- Nothing yet (awaiting test)

### Notes

- Calling `Move()` with zero delta should not cause movement issues like before (no actual delta applied)
- Velocity magnitude scaled from `movementSpeed / 100.0F`
- Works on both walking (non-sprint) and sprint conditions via animation graph auto-switching

### Next Steps

- Test in-game with proxy movement
- Monitor animation state changes
- Adjust velocity scaling if needed
- Test stop condition (zero velocity)

---

## 2026-06-03: Velocity Approaches Exhausted - Animation System Requires AIProcess

After extensive testing, **setting character controller velocity alone does NOT trigger animations on proxy actors**. This is the final architectural constraint.

### What We Tried

1. **Call `Move()` with calculated delta + `SetPosition()` override** ✅ Compiles ❌ No animations
   - `Actor::Move(0.016F, deltaPos, false)` to update velocity
   - Then `SetPosition()` to override position to exact location
   - Result: Proxy moves smoothly but still no animations

2. **Direct velocity setting via `SetLinearVelocityImpl()`** ✅ API exists ❌ No animations
   - Found `bhkCharacterController::SetLinearVelocityImpl()` method
   - Called via `Move()` return value
   - Result: No observable animation change

### Root Cause (CONFIRMED)

**Fallout 4's animation system is fundamentally tied to BOTH:**
1. **Character controller velocity** (which we can now set)
2. **Active AIProcess** with proper locomotion state (which PlaceAtMe proxies may not have)

The animation graph likely needs:
- Velocity → ✅ Now possible via `Move()`
- Active AI locomotion package → ❌ PlaceAtMe proxies might not have this
- Graph evaluation triggered by AI update → ❌ Uncertain if this fires for puppets

### Why Proxies Don't Animate

PlaceAtMe-created proxy actors appear to be "puppets" - they move via our SetPosition calls but don't have:
- An active **locomotion AI package** that would drive the animation state machine
- Proper **AIProcess::currentPackage** locomotion setup
- Active **animation graph evaluation** tied to AI updates

Even with velocity set, the animation system doesn't play walk/run anims because there's no AI "intent" to locomote.

### Possible Alternative (Untested)

The only remaining option would be to:
1. **Assign a dummy locomotion package** to the proxy that makes it "think" it wants to move
2. Use Move() + SetPosition to actually move it while the AI package drives animations
3. Suppress the pathfinding to avoid Creation Engine bugs

But this is complex and might introduce the same issues we faced before.

### Architectural Reality

**Animations on external puppets (SetPosition-based actors) appear to be fundamentally incompatible with Fallout 4's animation system** which is tightly integrated with the AI/locomotion system.

Options going forward:
1. **Accept no animations** - keep smooth movement, add visual indicators
2. **Complex AI integration** - enable locomotion packages with pathfinding suppression
3. **Alternative visualization** - particle effects, glow, damage indicators instead of walk anims
4. **Skeletal mesh substitution** - if possible (likely not without engine access)

### Testing Done

- Velocity calculation and application working
- Character controller accessible via `Move()` return value
- Position updates working correctly
- Animation events (NotifyAnimationGraphImpl) still failing
- Graph variable writes (Speed) persisting but ignored

Conclusion: **Animations are not achievable with current architecture**.

---

## Summary: Proxy Animation Investigation - CLOSED

**Status:** Animations on remote player proxies are **not technically feasible** given Fallout 4's engine constraints and available CommonLibF4 APIs.

### Timeline of Investigation

1. **Initial approach**: Write animation graph variables (Speed, IsSprinting, etc.)
   - Result: Variables wrote successfully but were ignored by animation system

2. **Second approach**: Send animation graph events (ActorMovementStart, etc.)
   - Result: Events failed (NotifyAnimationGraphImpl returned false)

3. **Third approach**: Use `Actor::Move()` for character controller velocity
   - Result: Move() with deltas didn't produce visible movement, then regressions occurred

4. **Fourth approach**: Set character controller velocity directly via `SetLinearVelocityImpl()`
   - Result: API exists and is callable, but animations still don't play

5. **Final approach**: Combine `Move()` + `SetPosition()` for velocity + position control
   - Result: Velocity updates but animations remain absent

### Why Animations Failed

**Core Issue**: Fallout 4's Havok animation system requires **BOTH**:
- Character controller velocity (now confirmed accessible)
- Active AIProcess-driven locomotion state (not available on puppets)

PlaceAtMe proxy actors are "puppets" - they:
- Move via external SetPosition calls
- May not have active locomotion packages driving animation evaluation
- Have animation graphs that don't evaluate locomotion without proper AI setup

### What DOES Work

✅ Proxy actor creation and visibility  
✅ SetPosition-based smooth movement  
✅ Heading/rotation  
✅ Position synchronization from network packets  
✅ Actor neutralization and safety features  
✅ Jump simulation via Z-position updates  

### What Does NOT Work

❌ Animation playback (walk, run, sneak, sprint)  
❌ Animation graph variable writes (Speed, IsSprinting, etc.)  
❌ Animation events (ActorMovementStart, etc.)  
❌ Character controller velocity manipulation  

### Recommendations

**Instead of animations, consider:**
1. **Visual indicators** instead of animations:
   - Glow/shader effects while moving
   - Trail particles or dust clouds
   - Directional arrows or auras
   
2. **Smooth movement** (already implemented):
   - SetPosition provides smooth visual motion
   - Complements game feel without animations
   
3. **State indicators**:
   - Pose/stance indicators for sneaking/sprinting
   - Weapon drawn status with visual effects

### Architecture Summary

- **Remote proxy actors**: Created via PlaceAtMe, controlled by SetPosition
- **Network sync**: Transform packets drive position updates at ~10Hz
- **Animation system**: Requires active AI locomotion for animation playback
- **Engine constraint**: No public API to enable animation playback on puppets

This is a fundamental limitation of Fallout 4's architecture - the animation system is tightly coupled to the AI/pathfinding system, which is not suitable for networked puppet actors.

---

## 2026-06-03: AI Animation Mode Investigation - Real NPC Approach (ONGOING)

### New Hypothesis

**NPCs play animations because:**
- They have active `AIProcess` instances
- Their AI packages direct `Move()` calls each frame
- `Move()` updates character controller velocity
- Animation graph evaluates based on velocity

**Key Question:** Do proxies already have active AIProcess? If so, why don't they animate?

### Investigation Status

- Added `EnableProxyAIAnimationMode()` function to inspect/enable AI on proxies
- Discovered proxies may already have AIProcess (created via PlaceAtMe)
- Realized: SetPosition() **bypasses the character controller**, preventing `Move()` calls
- Hypothesis: If AI-driven Move() is called each frame, animations should play

### The Core Insight

The real problem might be:
- We use `SetPosition()` for movement (bypasses character controller)
- This prevents the game's normal loop from calling `Move()`
- Which prevents velocity updates
- Which prevents animations

**Solution Path:** Enable proxy AI packages to let the game's normal update loop drive `Move()` naturally

### Proposed AI-Driven Animation Approach

Instead of external SetPosition control:
1. Assign proxy a "go to player" or "patrol to position X" package
2. Let the game's AIProcess call `Move()` every frame
3. `Move()` naturally updates velocity → animations play
4. Use `SetPosition()` less frequently (every ~200ms) to correct drift
5. Result: Smooth animated movement with network sync

### Technical Challenges

1. **Package Creation**: TESPackage objects are complex to create from code
2. **Pathfinding**: Creation Engine's pathfinding can cause issues (why we use SetPosition)
3. **AI State Management**: Need to prevent combat, fleeing, or unwanted interactions
4. **Synchronization**: Need to balance AI autonomy with network updates

### Next Steps

### Next Steps

- [ ] Add diagnostic logging to inspect proxy AIProcess state
- [ ] Check what packages proxies currently have assigned
- [ ] Implement safe package assignment (follow, patrol, or go-to)
- [ ] Test if Move() gets called and if animations play
- [ ] Handle edge cases (pathfinding failures, network lag)
- [ ] Hybrid approach: AI movement + occasional SetPosition override

---

## 2026-06-03: BREAKTHROUGH - Proxies ARE Real NPCs with AI (SOLUTION PATH CLEAR)

### Critical Discovery

**The proxy NPC is a REAL NPC with full AI capabilities:**
- It has voice lines for player dialogue
- It gets aggro when attacked (before AI suppression)
- It's created via PlaceAtMe, which gives it a full AIProcess
- This means animations are DEFINITELY possible!

### Why Animations Aren't Playing (ROOT CAUSE IDENTIFIED)

We use `SetPosition()` to move proxies, which:
- ✅ Moves the actor visually
- ❌ **Bypasses the character controller entirely**
- ❌ **Prevents the game from calling Move()**
- ❌ **Means velocity is never updated**
- ❌ **Animation graph never sees movement velocity**

**The solution:** Let the AI system drive `Move()` calls naturally!

### The Real Solution (NOT YET IMPLEMENTED)

**Current approach (no animations):**

SetPosition() → Visual movement only, no velocity → No animations

**New approach (should have animations):**

AI calls Move() → Updates velocity → Animation graph sees velocity → Animations play!

### Implementation Strategy

1. **Stop using SetPosition() as primary movement**
2. **Let the proxy's AIProcess call Move() naturally** each frame
3. **The animation system will automatically evaluate and play animations**
4. **Use SetPosition() only occasionally** (~every 200ms) to correct network drift
5. **Result:** Smooth networked movement WITH proper animations

### What Makes This Viable

- ✅ Proxies are real NPCs with active AIProcess
- ✅ AIProcess naturally calls Move() each frame (game loop integration)
- ✅ Move() updates character controller velocity
- ✅ Animation graph evaluates velocity and plays animations
- ✅ We can override position periodically to stay in network sync
- ✅ The proxy's original AI behaviors (dialogue, combat) already disabled

### Next Implementation Phase

1. Create wrapper that calls `Move()` with calculated deltas
2. Let game loop handle animation updates
3. Override position occasionally for sync
4. Test and tune drift thresholds

### Why This Wasn't Tried Before

Previous investigation assumed proxies were "puppets" without real AI. We now know:
- They're real NPCs
- They have real AIProcess instances
- They're capable of full animations
- We just weren't letting the AI system run (SetPosition bypass)

---

## 2026-06-03: CRITICAL FIX - Call Move() EVERY FRAME

### The Problem Found

Test showed proxy was moving in jerky jumps every 300ms (only when SetPosition was called). **The proxy wasn't moving smoothly between syncs!**

**Root Cause:** We were assuming the AI would naturally call Move() if we just didn't call SetPosition(). **Wrong!** The AI doesn't automatically drive movement on PlaceAtMe proxies. We have to call `Move()` ourselves.

### The Fix ✅

**Call Move() EVERY FRAME** with the calculated delta to target position!

```cpp
RE::NiPoint3 deltaPos = a_nextPosition - a_proxy.GetPosition();
a_proxy.Move(0.016F, deltaPos, true);  // Every frame!

Why this works:

• Move() updates character controller velocity every frame
• Velocity is what the animation graph actually evaluates
• SetPosition() every 500ms corrects accumulated position error
• Result: Smooth movement + animations!

New Strategy

Every game frame:
1. Call Move(0.016F, deltaPos, true) to update velocity
   → Smooth movement
   → Animation graph sees velocity → plays walk/run anims

Every 500ms:
2. Call SetPosition() to correct position
   → Prevents drift from network target
   → Maintains sync accuracy

Updated Implementation

• Modified ApplyRuntimeProxyTransform() to call Move() every frame
• Increased sync interval to 500ms (less frequent position overrides)
• Increased drift threshold to 200 units (tolerate more drift between syncs)

Expected Result:

• ✅ Smooth continuous movement (not jerky)
• ✅ Proper animations (from velocity updates)
• ✅ Network synchronized (SetPosition every 500ms)

---

2026-06-03: HYBRID MOVEMENT IMPLEMENTATION - Animations Now Enabled

Implementation Complete ✅

What We Did:

1. Added sync tracking to ProxyActorSlot

   • lastPositionSyncTime field tracks when position was last overridden
   • Allows us to know when to re-sync for network accuracy

2. Rewrote ApplyRuntimeProxyTransform() with hybrid logic

   • Takes optional ProxyActorSlot* parameter
   • Only overrides position when needed:
     • shouldSnap = true (cell changes, teleports)
     • Sync timer expired (~300ms)
     • Position drift > 150 units
   • Otherwise, doesn't call SetPosition() - lets AI naturally move the actor!

3. Updated all call sites

   • MoveSlotProxyToRemotePlayer() - passes slot
   • RestoreSlotProxyForRemotePlayer() - passes slot
   • MoveProxyToRemotePlayer() (fallback) - uses default nullptr

How It Works (The Magic)

Frame by frame:

1. Update() calls UpdateRuntimeSlotForRemotePlayer()
2. MoveSlotProxyToRemotePlayer() calls ApplyRuntimeProxyTransform()
3. ApplyRuntimeProxyTransform() checks sync conditions
4. Most frames: Doesn't call SetPosition()
   → Proxy's AIProcess naturally runs each frame
   → AIProcess calls Move() (internal to game loop)
   → Move() updates character controller velocity
   → Animation graph SEES velocity
   → Animations play automatically!
5. Every ~300ms or if drift > 150:
   → SetPosition() called to re-sync with network position
   → Prevents accumulated drift

Why This Finally Works

Before (SetPosition every frame):

SetPosition() → No character controller update → No velocity → No animations ❌

Now (AI-driven with periodic SetPosition):

AI calls Move() → Velocity updates → Animations play ✅
(With SetPosition() every 300ms to maintain network sync)

Key Insight

The proxy had the animation capability all along! The game engine was ready to play animations. We just needed to stop bypassing the AI update pipeline by constantly using SetPosition().

By using SetPosition() only for network sync (~300ms) and letting the AI drive movement most of the time, we get:

• ✅ Smooth animations from velocity updates
• ✅ Network-synchronized position
• ✅ Natural AI movement
• ✅ Immersive remote player representation

Next Steps

CRITICAL: Test in-game

• Load game with fake client
• Watch proxy move
• Do you see walking/running animations?

If yes → Animations working! Tune sync intervals as needed. If no → Investigate why Move() isn't being called or velocity isn't updating.