ResourceDropModifier

Resource Drop Modifier

A BepInEx mod for Valheim that gives every item that drops in the game its own drop multiplier, as an ordinary config setting. Made for a long-lived dedicated server where some resources run out and others pile up.

What it does

• On the first world load the mod adds a setting for every item that drops

from something to BepInEx/config/Gonfreecss.ResourceDropModifier.cfg, in a section per biome, each at 1. The setting's description says what the item is called in game and what drops it. Crafted gear has no setting unless a chest or loot pile hands it out.

• Change a number and that item drops that many times as much, from every

source: creatures, trees, rocks, bushes, chests, beehives, sap collectors, dungeon loot. 2 doubles it, 0.5 halves it, 0 turns it off.

• Edit it like any other setting: the in-game Configuration Manager window

on a host or in single player, a mod manager's config editor, or the file itself on a dedicated server. Changes apply within a second, no restart.

• The server's values are the ones that count. Clients receive them on join and

never have their own file rewritten. There is no client-side opt-out.

• After a game update new items appear as new settings, keeping the numbers you

set.

Valheim's own resource rate world modifier still applies on top, so this is a per-item refinement of that setting, not a replacement.

Details worth knowing

• Where the item is listed does not limit where it applies. Wood = 2 under

[Meadows] doubles wood from a Plains birch too. An item drops in several biomes is listed once, under the earliest one in progression order.

• Fractions are rolled, not rounded. 0.5 on a creature that drops one hide

drops it half the time.

• Some drops cannot be scaled. Vanilla exempts boss trophies, keys and the

like from the resource rate, and this mod respects that. The setting's description says Not scalable when it applies to every drop of an item.

• Stacked drops saturate at the stack size. A chest that would give 20

coins at 5 gives 100, not 999. Creature and rock drops cap at 100 objects.

• Bushes never give less than one unless the multiplier is below 1; at

0 they give nothing and are still marked picked.

Console commands

| Command | Does | |---|---| | rdm_reload | Re-read the config from disk and apply it. The file is watched, so this is for the cases where the watcher does not fire (some Docker volume drivers, network shares). | | rdm_rescan | Re-run the item scan and add any new settings, for prefabs another mod registered after world load. | | rdm_show <prefab> | Print the multiplier in force for an item, and whether it came from the server or the local file. |

Requirements

Everyone needs it. Drops are decided by whichever player is closest to the creature or rock, so a client without the mod drops vanilla amounts.

Requires Mushroom Sync on every client and on the server; the release zip ships it alongside.

Building

dotnet build ResourceDropModifier/ResourceDropModifier.csproj -c Release

Resolves the game path from the Steam registry. For an install in another Steam library pass it explicitly:

dotnet build ResourceDropModifier/ResourceDropModifier.csproj -c Release -p:ValheimDir="E:\Games\Steam\steamapps\common\Valheim"

The build copies the DLL into BepInEx/plugins when that folder exists.

How it works

docs/DESIGN.md: which two game methods every drop goes through, why the table is synced over a raw channel rather than config sync, and how the item scan decides which biome a setting lands under.