Fusion Fix Wiki

Introduction

Welcome to the unofficial Fusion Fix Wiki! The goal of this wiki is to document, highlight and keep track of as much Fusion Fix information for Grand Theft Auto: IV as possible.

Fusion Fix fixes and improves so many things in GTA IV, that it can be hard to keep up with what exactly the mod does. I'll try my best to provide as much information about as many changes as I can via this page.

Download & Installation

Fusion Fix has two very simple and easy installation methods. You can install the mod manually OR you can use the Fusion Fix installer. I'd recommend manual, but pick whichever you prefer.

Manual Installation (Windows, Steam Deck)

1. Download the latest Fusion Fix .zip from the official GitHub release page (found under Assets).
2. Open the archive you just downloaded and then copy and paste everything from the archive into your game folder where GTAIV.exe is located.

Tip

If you're not sure how to find your game folder...

• Steam: You can find it by right clicking on Grand Theft Auto IV: The Complete Edition in your Steam library, going to Manage and then clicking Browse Local Files. The GTAIV folder is where GTAIV.exe is located.

• Rockstar Games Launcher: You can find it by clicking on Settings in the Rockstar Games Launcher, click Grand Theft Auto IV: The Complete Edition in your installed games list, find View installation folder and then click Open next to it. The GTAIV folder is where GTAIV.exe is located.

For Steam Deck you also need to do the following...

1. Launch the Steam application while on your desktop, locate Grand Theft Auto IV: The Complete Edition in your Steam Library, press the Left Trigger on the game to open the context menu and press Right Trigger on Properties...
2. In General, go to Launch Options and in the text box enter WINEDLLOVERRIDES="dinput8=n,b" %command%". You can then close the Properties... window.

Installer Installation (Windows only)

1. Download the latest Fusion Fix installer from the official GitHub release page (found under Assets. Web installer will download the mod files when using the installer, offline installer downloads the mod files alongside the installer).
2. Launch the installer, it should automatically detect the location of your Grand Theft Auto: IV folder and then click install.

Graphics

Rain

Rain on PC was made almost invisible, rain streaks became shorter at higher frame rates and rain droplets on screen became pitch black and lost their refraction effect from console.

Fusion Fix makes rain much more visible, fixes rain streaks so they stay the same size regardless of frame rate and it makes rain droplets coloured again, as well as restoring the refraction effect.

Before

After

Before

After

Before

After

Reflections

Reflections were toned down significantly on PC, vehicle reflections became jagged due to a bug and mirror reflections became distorted at certain camera angles.

Fusion Fix restores the stronger console reflections, fixes the bug which made vehicle reflections jagged, and it fixes mirrors so they no longer become distorted at certain camera angles.

Before

After

Before

After

Shadows

Shadows were by far the most broken aspect of the game

After patch 1.0.6.0, they had horrible filtering, suffered from peter panning, had their draw distance reduced, performed significantly worse than the original shadows implementation and had many other issues.

Fusion Fix completely replaces the filtering and bias code, adds support for animated tree shadows, adds contact hardening shadows and it also fixes dozens of other bugs related to shadows in general.

Before

After

Before

After

Fusion Fix's Sharp Shadows

Fusion Fix's CHSS Shadows

Z-Fighting

The PC port of Grand Theft Auto IV was plagued with z-fighting not seen on other platforms.

Fusion Fix fixes this so z-fighting is basically nonexistent.

Object Fading

The 1.0.6.0 update for PC broke several graphical effects, one of them being screen door transparency in many materials, which led to the loss of LOD fade/blending. Terrain fading was also missing on ALL PC versions.

Fusion Fix restores this functionality from previous versions so fading now works again, and it also restores terrain fading from the console versions of the game.

Definition

GTA IV's PC port has an odd "Definition" option which ENABLES graphical effects when OFF, and DISABLES them when ON. One effect is a blur filter which hides this pixel pattern effect as objects fade, but the blur is WAY stronger on PC due to leftover anti-aliasing code. This basically blurs the entire image.

Vanilla Definition Off

Vanilla Definition On

Vanilla Definition Off

Vanilla Definition On

Fusion Fix removes this broken anti-aliasing code and makes it so the blur filter only applies to objects as the pixel pattern effect occurs when "Definition" is on, rather than applying to the entire screen when it's off, this means Fusion Fix provides a sharper and cleaner image than seen on any other platform.

Vanilla Definition On

Fusion Fix Definition On

Vanilla Definition Off

Fusion Fix Definition On

Depth-of-Field

GTA IV's depth of field effect doesn't scale correctly with resolution and it only looks correct at 720p like on consoles. Depth of field is also tied to the games "Definition" option.

Fusion Fix fixes the scaling by implementing an efficient bokeh blur rated up to 4K, and added an individual depth of field option separate from the "Definition" option. This allows you to not only toggle depth of field, but also control how strong it is during gameplay.

Before

After

Before

After

Anti-Aliasing

The Xbox 360 version of GTA IV ran at 1280x720 with 2x MSAA. Meanwhile the PC version lacked any anti-aliasing whatsoever.

Fusion Fix implements FXAA and SMAA, which are simple and performance friendly, and do an excellent job at smoothing out jagged edges, especially at high resolutions.

SMAA Off

SMAA On

Volumetric Fog

Fusion Fix adds a very nice volumetric fog shader to replace the games aging fog shader. This allows the draw distance to be massively increased, it hides the edge of the game world and fog no longer moves with the camera like it did in the vanilla game.

Volumetric Fog Disabled

Volumetric Fog Enabled

Volumetric Fog Disabled

Volumetric Fog Enabled

Sun Shafts

The sun in GTA IV is pretty effectless in comparison to every other 3D GTA game. So Fusion Fix adds an option for sun shafts/godrays, a nice effect that simulates light rays coming from the sun.

Sun Shafts Disabled

Sun Shafts Enabled

Sun Shafts Disabled

Sun Shafts Enabled

Improved Loading Times

GTA IV on PC has an unskippable intro and it takes you to a main menu first instead of just loading your last save immediately like console.

Fusion Fix adds a skip intro and skip menu option in the GAME menu, as well as improving overall load times. This significantly reduces how long it takes to get in-game.

Seasonal Events

Fusion Fix adds seasonal events to the game which includes snow at winter and a scarier atmosphere at Halloween. The snow effect is done almost entirely using shaders instead of replacing map textures, similar to GTA Online's yearly snow event. You can toggle this feature in the GAME menu.

Fusion Overloader

Fusion Fix adds a type of Modloader called Fusion OverLoader, you don’t really need to know too much about it for this guide. But if you do plan on installing more mods in the future, I’d recommend checking out my Fusion Overloader tutorial once you're done with this guide.

We'll be installing all our mods through Fusion Overloader in this guide, so you'll see how easy it is soon.

Even more...

If you want to know what else Fusion Fix fixes or adds to the game, you can either check out the full changelog on the Fusion Fix GitHub or you can watch my video covering nearly the entirety of the mod.

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