DeepNorthTerrainFix

DeepNorthTerrainFix

Created by FlorpyDorp. MIT licensed.

Fixes the Valheim 1.0 Deep North bug where a zone's terraforming vanishes, players get stuck forever in a portal

or on the login screen while someone is standing in that zone, the terrain flickers between two shapes, and

hard seams appear along zone borders in the snow.

Server owners: drop it on the server and you're done. Your players do not need to install anything.

The server heals the world it already has, removes duplicate compilers and dead stroke objects the instant they

arrive (before any other player can see them), and refuses to let an unmodded game delete a zone's terraforming.

Vanilla clients keep connecting as normal; nothing about the network protocol changes. Players may also install

it on their own game for extras (a 25 s portal escape, prevention at the source, the snow-ridge fix for their own

strokes), but that is optional. One DLL works in both places.

Updating from 1.1.x? Do it now. 1.1.x on a server alone could still lose a zone's terraforming to an

unmodded player (see the changelog). Your existing config file is migrated on the first start:

PatchNetworkBudget is reset to false once (the log says so). Nothing else to do.

What it does

Heals the save

• On world load, every 2 minutes, and whenever a new terrain compiler arrives over the network, it finds

zones that have more than one _TerrainCompiler object, merges their terrain data into the one with the

most data, and removes the rest. The result is written with the next world save.

• Console commands to scan, fix, reconcile zone-border seams, or reset one zone's terrain (buildings kept).

Protects the terraforming (server)

• A duplicate that arrives is removed inside the receive path and is never forwarded to any other player.
• The server refuses a client's request to destroy the compiler that holds a zone's terraforming. An unmodded

game sends exactly that request when a duplicate appears on its screen while it owns the real one; vanilla

then deletes every stroke in the zone. The compiler is kept and re-sent to everyone instead.

Prevents new damage (client side, where terrain objects actually live)

• Reuses the zone's existing compiler instead of spawning a duplicate.
• When two compilers collide, keeps the one with data instead of whichever spawned first, and removes the

other properly so the create/destroy loop cannot start.

• Hard 25 s teleport timeout so nobody is trapped in a portal.
• Stops a hoe/shovel stroke that crosses a zone line from being applied twice on the shared column (the

one-vertex ridge along zone borders in snow).

• Optional: raises the Steam send-rate cap and ZDO budget (off by default), and throttles the per-piece

snow-buildup sync that floods the network at large bases during snowfall.

Cannot do: bring back terraforming that vanilla already deleted. For that you need a backup of the world

folder from before it happened (the mod only stops it happening again; the repository has an offline tool that

can copy one zone's terrain from a backup into the current save).

Install

• Install BepInExPack for Valheim on the

dedicated server (most hosting panels have a one-click BepInEx option).

• Drop DeepNorthTerrainFix.dll into BepInEx/plugins.
• Restart the server. That's it. The log (BepInEx/LogOutput.log) shows [heal on load] lines for every

zone it repaired, and the repaired world is written at the next autosave (every 30 minutes) or when an

admin saves.

Players can optionally install the same DLL on their own game for the client-side extras.

Back up your world folder before the first run. The mod changes world data.

No console access? (most hosting panels)

You don't need the console. Everything important is automatic: heal on load, removal of duplicates and dead

stroke objects as they arrive, protection of the real compiler, and a background sweep every two minutes. The

console commands below are diagnostics and manual tools.

If you do want them without c