GoonLagoon Expanded Biome Fix

An independent compatibility patch for Expand World Size 1.33.0 and the inspected Valheim 1.0.12 biome generator. Requires Expand World Size; it does not replace that mod.

What it changes

Expands the native AltBiomeWorldData sampling grid and radius to follow Expand World Size's total world radius. It retains the native 12-meter sampling resolution and uses a separate geometry-specific biome cache. This addresses an empty biome point list encountered during location generation on an expanded world.

The patch does not suppress location-placement exceptions or guarantee that every requested location will be placed.

Installation

Install with r2modman and include dependencies. Install on the dedicated server and each client using the expanded world. Keep world geometry settings consistent and restart after changing them.

If you previously installed GoonLagoon.ExpandedBiomeFix.dll manually, remove that manual copy before installing this package. Only one copy should be present.

Verified scope

Version 1.0.0 is the exact DLL tested on a Linux dedicated server running Valheim 1.0.12, BepInExPack 5.4.2350 and Expand World Size 1.33.0. With world radius 14,142 m, edge 500 m and world stretch 1.4142, the patch loaded a 2,856 x 2,856 biome grid, populated Ashlands and Deep North, completed location generation and opened the Steam server without the prior ArgumentOutOfRangeException.

Client joining and extended gameplay have not yet been verified. Other game builds and world sizes are not verified. The code rejects total radii outside 1,000–30,000 m and unexpected patched instruction layouts. Larger grids consume more memory and generation time.

Designed and tested for a fresh world. It does not repair already generated terrain or guarantee repairs to existing saves. Check startup logs for the patch installation and biome coverage messages, followed by Loading: Done.

Credits

Expand World Size is by JereKuusela. This is a separate, unofficial compatibility patch; it is not endorsed by its author or Iron Gate. No original mod binaries or game assemblies are bundled.