IslandGrid layout, island radius limit, tile layers and the console cheats that expose island import/export

Island Grid

IslandGrid holds the tile layers and buildings of one island and is wrapped by Island, which is owned by a Player.

Class relationships

Player --get_Island--> Island --grid--> IslandGrid
                          \--owner (NetworkedVar<Player>)
PlayerSummary --island--> Player's island
GameState --Island(Player)--> Island of a given player

IslandGrid

Member	Type	Offset	Notes
`size`	`int2`	`0xF0`	Grid dimensions
`generationParameters`	`IslandGeneration.Parameters`	`0x1E8`	`HardLimit.radius` is the first field (`+0`)
`snapshotIslandSize`		`0x298`	not investigated
`arraySize`		`0x2AC`	not investigated

Methods of interest: Awake, Generate, GenerateJob, CanPlaceBuilding, ExportIsland, ImportIsland (private), SaveIslandToClipboard, LoadIslandFromClipboard. RVAs are in the Internals Reference.

Island radius (`HardLimit.radius`)

The playable land is limited by Parameters.HardLimit.radius, default 22. Setting it to 24 in a patch on IslandGrid.Awake produced slightly larger real land through the normal generation path (found with a native hook before moving to BepInEx; the same field applies).

Do not resize the tile arrays or scale the grid

Multiplying size (an earlier "size scale" approach) caused frustum-error log spam, a disappearing mouse cursor and compounding corruption on import. Raising HardLimit.radius is the safe approach. Pushing land toward the edge of the allocated array (roughly radius 24-26) is the danger zone - test incrementally.

Clipboard import / export

SaveIslandToClipboard and LoadIslandFromClipboard go through GUIUtility.systemCopyBuffer, which was unreliable when called outside OnGUI. A mod should call ExportIsland / ImportIsland directly and do its own clipboard handling, then use the format page to process the string.

Developer cheats

The in-game dev console (including saveisland / loadisland) is gated by two methods on Cheats:

Method	Effect when forced to return `true`
`Cheats.get_Available`	console/cheat commands become available
`Cheats.CheckAvailable`	same gate, second path

Both need to return true. With BepInEx a Harmony postfix does this (untested example - check exact member names in the interop assemblies):

[HarmonyPatch(typeof(Cheats), nameof(Cheats.CheckAvailable))]
static class CheckAvailablePatch { static void Postfix(ref bool __result) => __result = true; }

[HarmonyPatch(typeof(Cheats), nameof(Cheats.Available), MethodType.Getter)]
static class AvailablePatch { static void Postfix(ref bool __result) => __result = true; }

The BepInEx guide covers setting up the project.

Multiplayer notes (theory, not verified)

Island state is an IslandSyncedBehaviour. The working theory is that the host is the only authoritative sync source, so loading an island string onto another player's island on the host would replace it for everyone. This was never observed working live.

True host migration (reassigning the MLAPI listen server) is a different problem class and is not achievable by patching memory.