L2 Modding

MCP Server for Lineage 2 / Unreal Engine 2.5 asset modding — 25 tools. Extract, modify, repackage textures (.utx), generate procedural meshes (.usx), parse animations (.ukx), sounds (.uax), and maps (.unr).

Features

Textures

• Extract/inspect/import textures from .utx packages
• Codec: DXT1/DXT3/DXT5/P8/RGBA8/RGB8/G16 (decode + encode)
• Batch process: grayscale, invert, brightness, contrast, resize, blur, sharpen
• Batch import: folder of PNGs → .utx in one step
• Normal map, AO map, specular map generation
• Texture atlas builder (grid packing)
• PBR channel packer (metallic/roughness/AO/height → RGBA)

3D Meshes

• Procedural castle generator (towers, walls, battlements, gate, keep, floor)
• StaticMesh serializer for .usx packages
• Export to OBJ and FBX ASCII
• Import from OBJ back into the pipeline
• LOD generator (vertex decimation, LOD0–LOD3)
• Collision mesh generator (box, cylinder)
• Procedural heightmap terrain (hills, mountains, plains, island, noise)

Animations (.ukx)

• Parse AnimationSequence data (frames, bones, tracks)
• Export to BVH format (Blender/Maya compatible)

Sounds (.uax)

• List sound assets
• Extract sounds to WAV (PCM and embedded WAV)

Maps (.unr)

• Parse level data: brushes, static meshes, lights, player starts

Package Management

• Package browser: scan directories for mesh↔texture cross-references
• Package optimizer: remove dead exports, reduce size
• Package comparator: diff two packages

Installation

pip install -e .

Usage with opencode

Add to opencode.json:

{
  "mcp": {
    "l2-modding": {
      "type": "local",
      "command": ["python", "-m", "l2_mcp.server"],
      "enabled": true
    }
  }
}

MCP Tools (25)

Textures

Tool	Description
l2_list_package	List all assets in .utx/.usx/.ukx
l2_list_names	List name table entries
l2_texture_info	Detailed texture info (format, mips, palette)
l2_extract_texture	Extract single texture to PNG
l2_extract_all_textures	Extract all textures to directory
l2_import_texture	Replace texture with PNG (repacks .utx)
l2_batch_process	Batch transform (grayscale, invert, etc.)
l2_batch_import_textures	Folder of PNGs → .utx
l2_gen_normal_map	Generate normal/AO/specular map
l2_build_atlas	Pack textures into atlas grid
l2_pack_pbr	Pack metallic/roughness/AO/height → RGBA

Meshes & Level Design

Tool	Description
l2_create_castle	Generate procedural 3D castle
l2_generate_textures	Generate stone/roof/floor/gate textures
l2_create_usx_package	Export meshes to .usx
l2_export_obj	Export meshes to OBJ or FBX
l2_import_obj	Import OBJ → mesh pipeline
l2_generate_lods	Generate LOD0–LOD3 by decimation
l2_gen_collision	Generate collision mesh (box/cylinder)
l2_gen_terrain	Procedural heightmap terrain

Animations

Tool	Description
l2_animation_info	List animations in .ukx
l2_export_animation	Export animation to BVH

Sounds

Tool	Description
l2_list_sounds	List sounds in .uax
l2_extract_sound	Extract sound to WAV
l2_extract_all_sounds	Extract all sounds to WAV

Package Management

Tool	Description
l2_compare_packages	Diff two packages
l2_scan_directory	Scan L2 folder for mesh↔texture refs
l2_optimize_package	Strip dead exports, reduce size
l2_parse_map	Read .unr maps (brushes, actors, lights)

Supported Texture Formats

ID	Format	Description
0	P8	256-color paletted
1	RGBA8	32-bit RGBA
3	DXT1/BC1	4 bpp, optional 1-bit alpha
4	RGB8	24-bit RGB
5	DXT3/BC2	8 bpp, explicit alpha
6	DXT5/BC3	8 bpp, interpolated alpha
B	G16	16-bit grayscale

Project Structure

src/l2_mcp/
├── server.py          # MCP server (25 tools)
└── upk/
    ├── reader.py      # Binary reader (compact indices, GUIDs)
    ├── package.py     # UPK parser (.utx/.usx/.ukx) + serializer
    ├── texture.py     # DXT codec + texture decode/encode
    ├── writer.py      # Package rebuilder / repacker
    ├── mesh.py        # StaticMesh serializer + primitives
    ├── castle.py      # Procedural castle generator
    ├── obj_io.py      # OBJ/FBX export
    ├── obj_import.py  # OBJ import
    ├── animation.py   # .ukx parser + BVH export
    ├── normal_map.py  # Normal/AO/specular map generator
    ├── batch_builder.py # Batch import + heightmap terrain
    ├── lod.py         # LOD generator + collision mesh
    ├── browser.py     # Package scanner + optimizer
    ├── atlas.py       # Texture atlas + PBR packer
    ├── sound.py       # .uax sound extractor
    └── unr.py         # .unr map parser

License

MIT