2.0.0 is a complete rewrite. Targets Vintage Story 1.22.0 on .NET 10.
Per-player state, command feedback, auto-refresh, and the color pipeline are all new.
No data migrates from 1.x - no settings or state were persisted by earlier versions.

Added

• /rooms info - prints room dimensions, exit count, IsSmallRoom, cooling wall counts, and raw skylight/non-skylight tallies without triggering a visual highlight. Explicitly reports when skylight counts are unavailable rather than silently misreporting greenhouse status.
• /rooms farmland - scans a 5-block radius for BlockEntityFarmland and reports each farmland tile's roomness value, making it easy to confirm whether VS sees the farmland as being inside a valid greenhouse.
• Per-player overlay cache (PerPlayerRoomState.OverlayCache) - delta-checks block positions and colors before sending, avoiding redundant highlight calls on repeated show/auto-refresh.

Changed

• Architecture split: the single monolithic RoomToolsModSystem.cs is broken into focused files - RoomInspector.cs, RoomHighlighter.cs, RoomCommands.cs, PerPlayerRoomState.cs, RoomColorHelper.cs, and FarmlandHelper.cs. The mod is server-only; highlights are delivered to clients via VS's built-in HighlightBlocks API.
• Reflection cached at startup: FieldInfo for roomsByChunkIndex and MethodInfo for FindRoomForPosition are static readonly fields resolved once. Both are null-checked at every call site; a Logger.Warning is emitted at startup if either is null (signals a VS version mismatch).
• Per-player state: the single lastOverlayCache instance field is replaced by a ConcurrentDictionary<string, PerPlayerRoomState> keyed by PlayerUID. Entries are created on PlayerJoin and removed on PlayerDisconnect. Multiplayer correctness is no longer dependent on one player using the mod at a time.
• Log flood fixed: the per-block Logger.Notification inside the highlight loop is replaced by a single summary line emitted after the loop - [RoomTools] {location} - {n} problem block(s) in highlight.
• Highlight ID: changed from 9999 to 50001 to avoid collision with VS internal debug highlight IDs. VS's own /debug rooms uses ID 50; IDs above 50000 are documented as safe for mods.
• Room feedback: /rooms show now always tells the player what it found - enclosed cellar in blue, enclosed greenhouse in green, enclosed room in yellow, or an open room with the exit count and what the colors mean. The previous silent "Room overlay shown." response is gone.
• Open room gap detection rewritten: instead of coloring all non-seal blocks identically, the highlighter uses a PosInRoom bit scan + opposite-axis-pair heuristic to locate the specific positions that are air but have wall neighbors on a shared axis. True gaps (holes, missing blocks) appear in magenta; glass and trapdoors that let light through appear in orange. (Orange highlighting still isn't perfect)
• Room selection improved: TryFindContainingRoom now tries GetRoomForPosition first (which VS already biases toward enclosed rooms), falls back to a few positions above foot level, and finally scans the chunk room list by bounding-box containment. FreshRoomAtPosition uses the reflected FindRoomForPosition for a full BFS when the player runs /rooms show manually, ensuring post-build state is reflected rather than a stale cache entry.
• Color constants centralized: all ARGB values live in RoomColorHelper as named static readonly int fields. No ColorUtil.ColorFromRgba calls exist outside that class.

Fixed

• Everything turns red on open rooms (reported by Frozen_Baguette, CleverMagpie, Zephyr_Crow): the PosInRoom bit-index formula is now the single verified layout - (dy * sizez + dz) * sizex + dx - with a source-cited comment. The old code had two inconsistent formulas; the wrong one caused misaligned bit reads that made wall blocks appear interior and random interior positions appear as walls.
• Room never identified as cellar or greenhouse (Zephyr_Crow): downstream of the formula fix; IsSmallRoom and skylight counts now reflect the room the player is actually standing in.
• Log flooding (Kyoku): per-block logging replaced with a single post-loop summary.
• Auto-refresh produced visible chat entries (general): replaced SendChatMessage("/rooms show") with a server-side tick that calls ShowRoomForPlayer directly when the player has been stationary for 5+ seconds. No packets, no chat pipeline, no visible feedback unless the player asked for it.
• Color coding showed vanilla green instead of custom colors (QuickdrawMcGraw): highlight ID changed from 9999 to 50001; the vanilla debug tool no longer overwrites the overlay.
• Chiseled blocks not detected as seals (ChaoticNox): IsLikelyRoomSeal now includes an explicit allowlist check for chiseledblock and microblock code path prefixes, applied before the Replaceable / SideSolid checks.
• Greenhouse detection unreliable: the SkylightCount > NonSkylightCount check is retained where VS populates the counts, but /rooms info now explicitly reports when both counts are zero rather than silently claiming a room is not a greenhouse. The raw counts are always surfaced so the player can judge.
• Orange highlight for glass/trapdoors was unreachable: the old code tried to highlight glass and trapdoor blocks in orange within the open-room gap scan, but those blocks are walls (PosInRoom=0) and never enter the interior-only loop. Moved the orange highlight to the enclosed-room scan instead, where it now highlights wall blocks adjacent to the room interior that leak skylight - useful for diagnosing why a cellar has reduced cooling (skylight leaking in) or confirming which blocks contribute to a greenhouse's skylight ratio. (Orange highlight still isn't perfect, may not show when it should)

Removed

• Per-call typeof(RoomRegistry).GetField(...) / .GetMethod(...) - replaced by static cached fields.
• autoRefreshEnabled as a client-side field driving SendChatMessage - replaced by server-side PerPlayerRoomState and a server tick.
• RoomOverlayClient.cs, RoomOverlayMessage.cs, RoomOverlayRequest.cs - the custom packet layer was unnecessary; VS's built-in HighlightBlocks handles server->client rendering natively.
• Single shared lastOverlayCache on the ModSystem - replaced by per-player state.
• Per-block Logger.Notification in the highlight loop.

- Updated for 1.21.* -

Added

Notes:

Some weird edgecases:

• If you have issues with it highlighting red incorrectly scanning a different room, relogging, sometimes hugging the wall will fix it if its supposed to be a valid room. The engine is weird and it lazy loads.. im trying.  
• Sometimes invalid rooms also might stay as a valid room when a single block is removed, break another next to it and it should be properly invalid red... 
• Some blocks might be grey in an invalid room, its supposed to highlight problematic blocks like trapdoors and such, but as I said above its not very accurate.
  
  Please consider
  
  Report bugs/problems in the comments for now until I have properly opened up a discord page for this mod, thank you.

• Added /rooms list to display all rooms in the current chunk.

• Added /rooms show [index] to allow selection of a specific room to highlight by index.

• Rooms are color-coded based on properties:

  • 🔵 Blue: Small room with no exits (valid cellar)

  • 🟡 Yellow: Large room with no exits (too big to be a cellar)

  • 🔴 Red: Room with exits (open space)

• Added /rooms auto on|off toggle (client-side) to enable automatic re-highlighting every 5 seconds while idle.

• Greatly improved stability and validation of overlay drawing to prevent index errors or invalid highlighting.

Initial Release