Release 1.3.1

Important - this release comes in two flavors

1. The default one (stable) which contains a few small bug fixes / improvements over 1.3.0 and should generally be used
2. A version that contains a more up-to-date version of the remix runtime
   with the addition of a physical atmosphere, volumetric clouds + weather system and new tonemappers (Remix Plus) by
   • https://github.com/Kim2091
   • https://github.com/sambow23
   • https://github.com/TheGreatHMMMM)

⚠️ The second version is not ready for a full release as it has a bunch of issues (more on that further down below) ⚠️

If you want to test it:

1. Install the compatibility by following the Installation guide further down below.
2. Afterwards, download GTAIV-AtmosTestAssets-1.3.1.zip and extract its contents into your GTA4 folder (where GTAIV.exe is located) and replace all files when prompted

If you need support or have questions about this version, please ask on discord and refrain from creating an Issue on GitHub.

Changelog 1.3.1

• Changed DLSS RayReconstruction model to Model D which should get rid of reflection noise
• Slightly tweaked the new tonemapper settings that were introduced in 1.3.0 (made nights a little brighter)
• General code cleanup
• Fixed vertex color usage on vehicle livery which incorrectly tinted livery on 1.3.0

Physical Atmosphere Branch:

• Wired in-game weather to the atmosphere-weather system
• Modified atmosphere weather presets to fit IV's weather
• Rebased Remix-Plus onto a newer version of the remix runtime (dxvk-remix fork that comes with this release)
  • includes fixes and improvements for the atmosphere system
  • includes new Shadow Terminator fix that should smooth out hard shadow edges on lower poly meshes
  • DLFG 6x
  • volumetric/particle fixes
  • includes a very recent feature called Preserve path that improves the CPU bottleneck a little

⚠️ Issues with this branch due to recent remix changes / the atmosphere system ⚠️

• Clouds that come with the atmosphere system are performance intensive. You may need to disable cloud rendering or the physical atmosphere all together (more on that further down below)
• Alpha tested meshes like chainlink fences are unexpectedly rebuilding OMM's (micro triangles) and induce visual instability
• Surfaces with per surface tweaks (eg. wetness, emissive strength, dirt etc.) might not update as expected due to the new Preserve path feature (my dxvk-remix modifications that allow for per surface tweaks are not yet adjusted for that feature)
• Rain particle system is no longer visible
• General instability
• Loading into the game might result in missing meshes which can be fixed by entering and leaving the game menu via ESC

Changelog 1.3.0

• Settings: disabled color temperature setting + decrease desaturation influence
• Switched from global to the local tonemapper
• Fixed lights turning off when game is paused
• Fixed dlc phone bug #104
• Reduced default fog intensity
• Fixed black horizon fog #113
• Settings: fixed incorrect default values for rear lights on cars
• Settings: fixed timecycle_bloom_enabled read/write issue (could not be disabled)
• Rebased remix-fusion-fix fork onto 5.0
• Settings: added an option to force vertex color usage on vehicles (on by default) which properly colors wheels and other parts
• Direct input: forward middle mouse to ImGui
• General ImGui fixes + logic to reset comp-settings to their defaults by using the Middle Mouse Button
• Silenced pattern scan on release builds - only print errors
• Installer: added ability to skip base mod download if it was installed manually
• Added a workaround (hack) to fix Nicos invisible head after spawning (entering and leaving the menu via ESC also fixes the head)

Changes to CompSettings (and Remix settings)

• CompSettings: now tracking a version per setting so that the comp mod no longer resets every comp-setting after an update. It will only reset settings that have drastically changed default settings due to logic changes under the hood.

• Added Addon .conf and .toml file loading (rtx_comp/addon_settings/)

  • Files in 'addon_settings' are automatically loaded on game start and are applied in inverse alphabetical order (lower to higher priority).

  • Community modders should use the addon_settings system to modify comp-mod / remix settings instead of directly editing the comp_settings.toml / rtx.conf files.

  • Files in addon_settings/presets are listed in a listbox inside the [Setting Presets] section in the Comp Settings tab of the F4 menu
    and can be manually applied in-game by the user to quickly change the appearance of the game.

Fixes by Thundery_Dan

• Dirt was added to the GTA_VEHICLE_MESH shaders
• Fixed UV of the Dirt layer that is generated when the vehicle uses liveries
• The material types GTA_EMISSIVESTRONG and GTA_EMISSIVESTRONG_ALPHA have been added to be rendered with global UV animations, and GTA_HAIR_SORTED_ALPHA has also been added to work with the NPC hair alpha testing option
• Increased maximum draw distance for API light visualization to 3000 units and added more disable backface culling hashes
• General light modfications and taxi bug fixed

• Lamppost fixes

• Fixed TVs

Remix runtime changes:

• Added colorgrading support to the local tonemapper
• Updated remix runtime assets and enabled SSS (Subsurface Scattering)

---

Installation:

Install using the installer:

1. Download GTAIV-Remix-CompatibilityMod-1.3.1.zip

2. Download GTAIV-Remix-CompMod-Installer.exe

3. Place both files in the same folder (no need to copy them to your game folder) and run GTAIV-Remix-CompMod-Installer.exe

4. Use the File Dialog to select your GTAIV.exe which is located in your GTAIV install folder

5. If this is your first time installing, the installer will ask if you want to install a custom Fork of FusionFix
   If you already have FusionFix installed, it's definitely recommended to install this because the original, unmodified version has a few incompatibilities with RTX Remix. If you do not have FusionFix installed, you are free to choose. It's not a requirement.

6. The installer will ask you if you want to download the required base-remix-mod

7. Make sure that you remove all custom launch arguments for GTAIV in Steam (if you have any set)

OR Install manually (no need to do this if you've used the installer):

1. Download GTAIV-Remix-CompatibilityMod-1.3.1.zip

2. Open the zip and extract all files contained inside the GTAIV-Remix-CompatibilityMod folder into your GTAIV directory (next to the GTAIV.exe). Overwrite all when prompted.

3. If you want to use FusionFix or have it installed already, it's definitely recommended to install my custom fork of FusionFix because the original, unmodified version has a few incompatibilities with RTX Remix.
   You can find the files inside _installer_options/FusionFix_RTXRemixFork. Extract the plugins & update into your GTAIV directory and override any existing files.

4. Download gta4-rtx-base-mod

5. Extract the mods folder (inside of gta4-rtx-base-mod-master) into your rtx-remix folder so that the folder structure looks like this:

.  
├─ ...
├─ 📁 steamapps
│  └─📁 common
│     └─📁 Grand Theft Auto IV
│       └─📁 GTAIV
│         ├── 📜 GTAIV.exe.exe
│         ├── 📜 d3d9.dll
│         ├── 📜 ...
│         │
│         ├── 📁 rtx_comp
│         └── 📁 rtx-remix
│             └─📁 mods
│               └─📁 gta4rtx
│                 ├── 📜 comp_cars.usda
│                 ├── 📜 comp_effects.usda
│                 ├── 📜 mod.usda
│                 └── ...
└── ...  

Usage and general Info

• Run the game like normal or use the provided batch files (mentioned in the Wiki further down) if you notice heavy stuttering.

• If you are having trouble launching the game, follow: https://github.com/xoxor4d/gta4-rtx/wiki/Troubleshooting---Guides#wrong-resolution--hud-scaling-incorrect

• Adjust distance and quality sliders in the GTA4 graphic options (higher values => earlier CPU bottleneck).
  Try 40 for view distance and 30 for quality and adjust from there.

  Press Alt + X to open the Remix menu
  Press F4 to open the Compatibility Mod menu

Important

Troubleshooting / Guides -- Look into the Wiki if you are having issues:
https://github.com/xoxor4d/gta4-rtx/wiki/Troubleshooting---Guides

Physical Atmosphere Usage:

• Switching between the new atmosphere system and the old sky rasterization logic (Alt + X / Developer menu):

• Disable cloud rendering:

  • Alt X menu, Game Setup, Sky Tuning, Clouds section -> Uncheck Enable Clouds

• Tweaking weather presets

  • F4 menu, Dev tab, Timecyle related -> enable Manual Atmos and choose a weather
  • Set absolute val to 1 and click apply absolute value
  • Alt X menu, Game Setup, Sky Tuning, Weather Presets -> Select the same preset you choose in the F4 menu and tune settings to your liking

⚠️ Never save settings to your rtx.conf. Either save settings to user.conf or export changes to a new config file. Make sure to only copy rtx.weather.preset ... and rtx.atmosphere ... settings!

⚠️ If you plan to ship your new weather presets as a mod, use the new Addon config system mentioned in 1.3.0 changelog and do not overwrite files that come with the comp mod!

Much love / credits to:

Thundery_Dan, Budgie, Kim2091, sambow23 (CR), TheGreatHMMMM, FusionFix Team and everyone else involved!

** edit:

• 6th June 26: updated GTAIV-AtmosTestAssets-1.3.1.zip because I forgot to add a_gta4-rtx.asi **
• 7th June 26: updated GTAIV-Remix-CompMod-Installer.exe to include latest changes (git support)