JohnM
a2f3f830e6
Shooting a vending machine on mp_terminal drew large flat yellow, white and red sheets next to it and made the game stutter. A spark fountain that runs relative to its effect was sprayed from the effect-local spawn origin, and the custom draw then placed the cells with the cloud matrix T(pos) R(quat) S(vis scale). Prop sparks (props/credit_card_touchpad_exp on the card touchpads, and explosions/powerlines_* from the vending machine's tv_explosion) carry a vis scale of 150, so every spark was drawn 150 times too big; barrelexp and small_vehicle_explosion (scale 10) were 10 times too big. New cells also had every sample time at 0, which ends the ribbon at origins[3]: about 1,780 untraced cells stacked one 150-unit quad on the effect point until the tracer, 16 cells per update, reached them. The spray now gets the world spawn point (spawn_origin_world), untraced cells start as an unobstructed arc (spark_fountain_integrate_miss_cell), and the custom draw is submitted with a unit placement (spark_fountain_draw_cloud). The cells are already in world space and the fountain shader only applies view and projection, so the vis scale stays a draw gate and no longer scales the vertices. Bounce traces now run in the same space as world collision. The elem keeps drifting on its velocity graph (0.4 units/ms on most fountains) while the sparks stay where they were sprayed, so the fountain is now culled around the spray point, with the radius grown by how far a spark can have flown by then (max speed * t + |gravity| * t^2 / 2, times the bounce fraction when it is above 1). Sparks no longer follow an effect that moves after spraying them. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
IW4L
IW4L is an open-source runtime for Call of Duty: Modern Warfare 2 (2009), written in Rust with Bevy. Point it at a copy of MW2 you already own and it loads that installation's maps, models, textures and weapons into its own engine. You can try implemented movement and combat on multiplayer maps, then inspect or change how those systems work.
What you can try
Explore maps, fight bots, and record and replay demos. Gameplay remains incomplete; expect missing behavior, bugs and desyncs. The asset readers also cover MW3 and Black Ops.
APIs, configuration, caches and the wire protocol change between commits; multiplayer peers must run the same build.
Windows: prebuilt release
- Download
iw4l-windows.zipfrom Releases and extract it into an empty writable folder. The archive password ist.me/contextrot. - Launch
iw4l.exe. It finds MW2 in your Steam libraries and creates aModern Warfare 2.lnkshortcut next to itself. For an install outside Steam, create that shortcut to your MW2 folder yourself.
For online play, put the .iw4l-server file you received from a server operator next
to iw4l.exe. With it the game finds that master and updates itself on launch. Details:
Windows guide.
Build and run
Install Rust through rustup and GNU Make. Build dependencies cover Linux's C/C++ toolchain and system libraries, and macOS's Xcode command line tools. Windows instructions cover building and arranging a portable folder.
You need your own installed MW2 Multiplayer data. IW4L
distributes no game assets and reads installations without patching or replacing their
files. Caches, demos and logs go under iw4l-artifacts/; Linux settings use a separate
configuration directory described in the run guide.
From the repository root:
cp .env.example .env
# Edit .env: set IW4L_GAMES to the folder containing your game installations.
make map mp_boneyard CMDS='wait world; spawn 0; force_match_start; bot add 3'
This builds the optimized play profile and starts a local match with three bots.
force_match_start skips the warmup that otherwise freezes movement.
Inside the engine
| Area | Implementation |
|---|---|
| Assets | Native FastFile readers convert game data into a shared intermediate representation. |
| Shaders | Retail Direct3D 9 Shader Model 3 bytecode is translated to WGSL. |
| Rendering | World geometry, models and effects feed one sorted draw-surface list. |
| Simulation | Server authority, client prediction and replay share one simulation step over explicit Bevy ECS state. |
| Networking | Custom UDP traffic; a QUIC master provides browsing and relaying. The host simulates the match. |
Where to go next
- Run guide: console commands, classes and demo playback; master setup for playtests.
- Rendering and simulation: inspect the engine's implementation.
- Map loading, GSC runtime and bot AI: starting points for experiments and modifications.
- Documentation index, contributing and security reports.
This whole project is written by an LLM.
Acknowledgements and license
Thank you to all contributors for code, bug reports, testing and feedback. Special thanks to ju1cedr1nker and silvernote03 for QA testing weapons, maps, attachments and other gameplay features.
OpenAssetTools and its iw4x-x64 fork informed asset layouts; IW4x informed asset and protocol behavior; KisakCOD informed engine structure. Ghidra was used to inspect the original binaries.
Movement implementation history and source boundaries are recorded in its provenance note.
IW4L's source is licensed under Apache 2.0. Preserve required attribution and bundled font license texts when redistributing; see NOTICE. Original game assets and trademarks belong to their owners. IW4L is unaffiliated with them.