What’s New in GTA 4 RTX Remix Update 1.1.5? Rain Improvements, Texture Fixes & Key Bug Resolutions Explained

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As the gaming world collectively holds its breath for the neon-drenched future of Grand Theft Auto VI, a quieter—but no less impressive—revolution is reshaping a beloved classic. For PC enthusiasts, the GTA IV RTX Remix mod has become the definitive way to revisit Liberty City, transforming its gritty 2008 visuals with the power of real-time path tracing.

Now, RTX Remix Update 1.1.5 has arrived. Rather than introducing sweeping new features, this release focuses on the kind of meticulous polish that turns an impressive technical showcase into a stable, immersive experience. From glitchy glass and inconsistent textures to rain effects that didn’t quite behave as intended, Update 1.1.5 targets the small details that quietly break immersion—proving that Liberty City’s future is being built one precise fix at a time.

The Heart of the Update: RTX Remix 1.1.5 Changelog Explained

Think of Update 1.1.5 as a master craftsman refining their work. The changes are specific, targeted, and designed to bring visual harmony and better user control under the new path-traced lighting system.

Visual & Texture Polishing

GTA 4 RTX Remix Update 1.1.5 Guide: Rain Improvements, Texture Fixes & Key Bug Resolutions Explained

The advanced lighting introduced by RTX Remix can expose weaknesses in GTA IV’s original assets. This update directly addresses several of those problem areas.

Glass and Transparency Fixes

Various in-game glass surfaces—from taxi windows in Broker to towering skyscrapers in Algonquin—have been corrected. Reflections and light transmission now behave more realistically, eliminating odd transparency artifacts and immersion-breaking visual glitches.

Material-Specific Tweaks

Two particularly noticeable fixes target:

  • “Bergen wood” textures, commonly found on docks and cargo crates

  • Metal surfaces on taxi cabs

These materials now react more naturally to global illumination and reflections, giving Liberty City a more grounded and believable look under path-traced lighting.

A Smarter, More Realistic Rain System

Rain is a defining part of Liberty City’s atmosphere, and RTX Remix makes every drop visible. Update 1.1.5 brings welcome refinements.

Enhanced Rain Particles

Rain particle effects now feature reduced collision thickness, preventing downpours from looking like solid sheets. The result is more natural rainfall, especially during intense storms that define GTA IV’s mood.

Critical Rain Bug Fixes

A bug that caused rain effects to restart incorrectly has been fixed. In addition, the option to disable raindrops on translucent vehicle windows now works properly, giving players greater control over visibility while driving in heavy rain.

Greater User Control and Configuration Options

Update 1.1.5 also empowers players who enjoy fine-tuning their experience.

rtx.conf Customization

Advanced users can now edit the rtx.conf file to:

  • Disable projected light coronas (the bloom around streetlights and signage)

  • Unhide certain textures that were previously inaccessible

This opens the door to more personalized visual styles, from cinematic glow to a cleaner, more realistic presentation.

Interface Improvements

The in-game configuration menu has received subtle layout and organizational improvements, making it easier to navigate RTX Remix and compatibility settings without friction.

Before You Install: What Is the RTX Remix Mod?

If you’re new to this project, it’s important to set expectations.

A Compatibility Layer, Not a Remaster

Created by modder xoxor4d, this is a compatibility mod that allows NVIDIA’s RTX Remix platform to work with Grand Theft Auto IV. Its main purpose is replacing the original lighting engine with a fully path-traced system that simulates real-world light behavior.

A Foundation for the Future

The mod does not include high-resolution textures or new models. Instead, it provides the physically accurate lighting foundation that future community-made assets can fully take advantage of.

Extremely Demanding Hardware Requirements

Path tracing is the most advanced rendering technique available today. A powerful RTX 40-series or equivalent GPU is strongly recommended, and GTA IV’s famously CPU-heavy engine often creates bottlenecks. Performance tuning is an expected part of the experience.

Your Complete Guide to Installation & Setup

Ready to dive in? Follow these steps carefully for a smooth installation.

What You Need

  • A legitimate copy of Grand Theft Auto IV: The Complete Edition (v1.2.0.59) on Steam or the Rockstar Games Launcher

  • Mod files downloaded only from the official GitHub project page

  • A high-end PC capable of handling path tracing

Step-by-Step Installation

Run the Installer
The downloaded package includes an installer. When prompted to install a custom fork of FusionFix, you must accept it. FusionFix resolves countless base-game bugs, and the included version is specially modified for RTX Remix compatibility. Skipping this step is one of the most common causes of crashes.

Launch with the Right Tools
Do not launch GTA IV through Steam. Use the new .bat files created in your game directory. For stuttering issues,
_LaunchWithProcessorAffinity_Half_GTA4__Half_Remix.bat
is essential—it intelligently balances workload across CPU cores.

Access the Control Panels

  • Alt + X: RTX Remix settings (path tracing, DLSS, XeSS)

  • F4: GTA IV compatibility and tweak menu

Mastering Performance: Expectations and Fixes

Performance management is crucial.

Accept the CPU Bottleneck

It’s normal if your GPU isn’t running at full usage. GTA IV is extremely CPU-heavy, and path tracing magnifies this limitation.

The #1 Performance Fix

Lower Draw Distance and Detail Distance in the original game settings. The developer recommends starting at 30 (Draw) and 40 (Detail)—this single change can dramatically improve frame rates.

Advanced Tweaks

In the F4 menu, increasing Tree Alpha Cutout Value (e.g., to 160) can boost performance by simplifying distant foliage.

AMD GPU Users

The mod works well on Radeon hardware. Select XeSS in the Alt + X menu for the best balance of image quality and performance.

The Bigger Picture: Why Update 1.1.5 Matters

RTX Remix Update 1.1.5 isn’t just a list of fixes—it’s a sign that the project is maturing. By eliminating specific bugs and expanding user control, the developer is stabilizing the platform for what comes next: community-made HD textures, PBR material overhauls, and custom asset imports.

Much like Half-Life 2 and Morrowind before it, GTA IV is now part of the RTX Remix renaissance. Update 1.1.5 ensures Liberty City isn’t just preserved—it’s reborn. Bathed in physically accurate light, refined rain, and improved materials, the city once again feels alive, allowing both longtime fans and new players to experience its gritty soul as if for the very first time.   

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