Grand Theft Auto IV - RTX Remix Compatibility Mod

Overview

The good:

• DLSS 4.5 (Ray Reconstruction 2) support
• DLSS 5.0 (Neural Rendering) support (if you provide the necessary dll) - Integration made by Sparkles
• Includes an Atmospheric sky system with Volumetric Clouds made by the Community Remix Plus / Numos
• Most objects rendered via fixed function to increase performance (compared to grabbing data from Vertexshaders)
• Cascaded anti culling of meshes
• All game lights (including the sun) are translated to remix lights
• Ability to create overrides for translated game lights (change position, color, intensity etc.)
• Vehicles now feature two headlights and two rear lights instead of single, centered ones
• Dynamic emissive surfaces work (vehicle lights, building-windows, shops etc.)
• Dynamic wetness that works similar to the original game
  (only outdoors and with falloff on angled surfaces + raindroplets/impacts)
• Raindroplets on vehicles and character clothing
• Working vehicle dirt and livery
• Modification of remix runtime variables based on current timecycle settings
• Mobilephone works (but it is 3D and currently scales with the camera fov)
• Modified vertex shaders (based on FusionFix) so that remix is able to capture surface normals
• Ability to spawn unique marker meshes that can be hidden based on distance, weather or time of day (these can be used to attach remix replacements or scene lights)
• Screenshot Mode, FreeCam Mode and other Utilities
• FusionFix compatible (custom fork: GTAIV.EFLC.FusionFix.RTXRemix)
• Many many tweakable settings via the in-game F4 menu
• A few PBR materials, hq-meshes (vegetation, modeled fences ..) and texture fixes
• Mod Installer / Updater

The bad:

• CPU Bottlenecked - Nvidia is constantly updating RTX-Remix and already made changes to improve this
• Can be stuttery when traversing the world
• No blood on peds

Installing the Mod

• Grab the latest Release and follow the instructions found there

Uninstalling the Mod

• Delete d3d9.dll and a_gta4-rtx.asi or use the provided _toggle-gta4-rtx.bat to quickly toggle RTX-Remix
• Some other minor files remain in the updates folder (mainly .img files starting with 1__remix ..)
• Re-install the official FusionFix mod if you used the custom Fork

Usage

• Run the game like normal
• Press F4 to open the in-game gui for some compatibility tweaks or debug settings
• If you notice heavy stuttering, launch the game with the included _LaunchWithProcessorAffinity_2Cores_GTA4.bat.
  Doing this will assign 2 cores to GTA4 and the rest to Remix. If you want a 50/50 split, use _LaunchWithProcessorAffinity_Half_GTA4__Half_Remix.bat

[!TIP]
Troubleshooting / in-depth guides, usage information and remix runtime changes can be found in the [Wiki]

Compiling

• Clone the repository git clone --recurse-submodules https://github.com/xoxor4d/gta4-rtx.git
• Optional: Setup a global path variable named GTA4_ROOT that points to your game folder (where GTAIV.exe is located)
• Run generate-buildfiles_vs22.bat to generate VS project files
• Compile the mod
• If you did not setup the global path variable:
  rename gta4-rtx.dll to a_gta4-rtx.asi and copy it into your game directory (next to GTAIV.exe)
• If you have not installed a release build before, make sure to copy everything within the assets folder into the game directory
• Make sure to also install: gta4-rtx-base-mod

Credits

• NVIDIA - RTX Remix
• People of the showcase discord - especially the nvidia engineers ✌️
• Dear ImGui
• imgui-blur-effect
• minhook
• toml11
• Ultimate-ASI-Loader
• miniz
• Rapidjson
• DiscordRPC
• FusionFix
• FusionShaders
• Rage-Shader-Editor
• IV-SDK
• IV-SDK-DotNet
• AssaultKifle47
• DayL
• Entity
• Gabdeg
• Hemry
• Danlopand / Thundery_Dan
• KapibosRU
• Budgie
• Alex from Digital Foundry
• Sparkles (Remix Plus - Numos - DLSS5 Integration)
• CR (Remix Plus)
• TheGreatHMMMM (Remix Plus)
• Gokuwashere (Remix Plus)
• All 🍓 Testers