Prefab Hammer

Prefab Hammer is an advanced construction utility for Valheim. It allows players to capture custom build combinations (prefabs/blueprints) directly from their existing structures, name them, manage them in a catalog, and build them using standard resource calculations.

Features

Manual Component Selection: Aim at built pieces and press J to select them one-by-one with a pulsating green outline.
Exact Geometry Outlines: Selection highlights clone the piece's actual visual meshes, making the green transparent overlay conform precisely to floors, sloped roofs, beams, and custom shapes.
Name & Save Dialog: Press K to open the solid-colored popup manager, name your creation, and save it.
Prefab Library Catalog: View your blueprints in a scrollable list, delete them safely with confirm prompts, or open the catalog using Delete or Shift + K.
Unequip Cleanup: Switching away from the Hammer automatically clears outlines and selections to prevent world clutter.
Radius Fallback: Pressing the save hotkey without selecting anything falls back to saving all pieces in a radius.
Chat Commands: Use /prefablist, /prefabsave, /prefabreload, and /prefabdelete.

Keybinds (Configurable)

J: Toggle manual piece selection (must hold Hammer).
K: Open save panel / Prefab Manager.
Delete or Shift + K: Open Library Catalog directly.

Installation

Prefab Hammer requires BepInEx to run.

Install BepInExPack Valheim.
Place PrefabHammer.dll into the BepInEx/plugins/ directory (or download directly via r2modman).

Configuration

You can customize the mod's behavior by editing BepInEx/config/com.prefabhammer.cfg (or using r2modman's Config Editor):

BuildCategory: The specific build menu category tab where ALL of your custom saved structures/prefabs will be loaded.
- Defaults to Prefab (a new dedicated custom tab added to the Hammer's menu).
- Can be set to vanilla tabs like Misc, Crafting, Building, or Furniture.
- Important: Any structures you save will be grouped under this single configured tab. If you are upgrading from an older version of the mod, your configuration file may still be set to Misc. Change it to Prefab if you want to use the new dedicated tab.
SaveHotkey: Hotkey to open the save panel (default: K).
SelectHotkey: Hotkey to toggle selecting pieces (default: J).
DefaultRadius: Capture radius in meters for the fallback area save (default: 5.0).

Features

Manual Component Selection: Aim at built pieces and press J to select them one-by-one with a pulsating green outline.

Exact Geometry Outlines: Selection highlights clone the piece's actual visual meshes, making the green transparent overlay conform precisely to floors, sloped roofs, beams, and custom shapes.

Name & Save Dialog: Press K to open the solid-colored popup manager, name your creation, and save it.

Prefab Library Catalog: View your blueprints in a scrollable list, delete them safely with confirm prompts, or open the catalog using Delete or Shift + K.

Unequip Cleanup: Switching away from the Hammer automatically clears outlines and selections to prevent world clutter.

Radius Fallback: Pressing the save hotkey without selecting anything falls back to saving all pieces in a radius.

Chat Commands: Use /prefablist, /prefabsave, /prefabreload, and /prefabdelete.

Configuration

You can customize the mod's behavior by editing BepInEx/config/com.prefabhammer.cfg (or using r2modman's Config Editor):

BuildCategory: The specific build menu category tab where ALL of your custom saved structures/prefabs will be loaded.

Defaults to Prefab (a new dedicated custom tab added to the Hammer's menu).
Can be set to vanilla tabs like Misc, Crafting, Building, or Furniture.
Important: Any structures you save will be grouped under this single configured tab. If you are upgrading from an older version of the mod, your configuration file may still be set to Misc. Change it to Prefab if you want to use the new dedicated tab.

SaveHotkey: Hotkey to open the save panel (default: K).

SelectHotkey: Hotkey to toggle selecting pieces (default: J).

DefaultRadius: Capture radius in meters for the fallback area save (default: 5.0).