Momentum Mod is a standalone game built on the Source Engine, aiming to centralize movement gametypes found in CS:S, CS:GO, and TF2.

Lumper

Lumper is a program for viewing and manipulating the various "lumps" that constitute Source Engine map files (BSPs).

It is not a map authoring tool like Hammer, which operates on map source files (VMFs) that are then compiled to BSPs. Lumper is intended for small, destructive tweaks to existing maps. It's most similar to VIDE, which is unfortunately closed-source, inactive, and doesn't support more recent BSP versions.

Features

Entity Editor

View and edit the contents of the entity lump à la EntSpy/VIDE. Includes a "Raw Entities" view for editing the entire lump as plaintext.

Pakfile Editor

View and edit the contents of the pakfile lump with a built-in file tree, text editor, and VTF viewer. It supports importing files/directories, exporting to the filesystem, and can automatically update references to paths in other lumps when items are moved.

Texture Browser

Displays every VTF file packed into the pakfile, like Hammer's texture UI.

Jobs

Jobs are a way of automating repetitive tasks, particularly for Momentum map porting. Multiple jobs can be ordered sequentially, and export/imported as JSON "workflow" files. The current jobs we support are:

• Stripper - Apply Stripper:Source configs to a BSP. What is usually done at runtime on a server via SourceMod can be permanently applied to the BSP file!
• Replace Textures - Update the texdata lumps to refer to different material files. Supports regex!
• Run External Tool - Runs a given executable on the loaded BSP.

Compressed Exporting

Lumper can load and save LZMA compressed BSPs, including the pakfile, producing the same result as bspzip.

JSON Diffs

Lumper can serialize the contents of the BSP to JSON files, helpful for analysing a BSP in a human-readable format and diffing BSP versions in Git.

Download

See the Releases tab on the right! This program is very new, and we don't currently have any kind of auto-updater, so worth checking back here for updates regularly.

Momentum

Lumper is developed by the Momentum Mod team and contributors. We frequently need to adjust BSPs slightly when porting for official map submission. Out of respect for mappers we avoid modifying the original BSP as much as we possibly can. Manipulating existing BSPs is much less intrusive than decompiling, adjusting, then recompiling. Lumper lets us:

• View the important parts of the BSP for moderation during map submission, especially the pakfile lump.
• Remove packed assets we shouldn't be storing/serving (usually Valve stuff, e.g. CS:S textures packed for use in CS:GO).
• Tweak entities to better use native Momentum entities, and remove unnecessary ones, often via Stripper configs.
• Move pesky music files to the sound/music/ directory of the paklump so they're affected by the right volume sliders ingame.

Technical Details

Lumper is written in C#, targeting .NET. It's divided into three subprojects:

• Lumper.Lib - Library for BSP manipulation, with minimal dependencies. Also includes jobs. Rather than do VTF handling oureslves we use VTFLib.NET, which provides .NET bindings for VTFLib.
• Lumper.UI - GUI frontend using Avalonia. It uses an MVVM architecture with XAML for layouting and ReactiveUI for reactivity and view ↔ viewmodel binding.
• Lumper.CLI - Simple CLI application for repetitive tasks, especially jobs. It's WIP and as of writing, barely functional.

See our wiki for more info!

Contributing

We are happy to accept contributions! Whilst we prioritize Momentum-related use-cases ourselves, we hope this tool is helpful to anyone using Source 1, and we welcome contributions and bug reports from people not involved with Momentum.

Besides this repo the best way to contact us is on the Momentum Mod Discord server, ideally in the #tooling channel.