If you have located a legitimate copy of the RTGI 01702 files, the installation process generally follows these steps:

You cannot run RTGI alone. You need the ReShade framework.

If you are looking to download RTGI files, caution is your best friend. Because these files are often DLL injections or shader files, they can potentially be flagged by antivirus software or, in rare cases, be tampered with if downloaded from unverified third-party sites.

Tips for a Safe Download:

To understand the hype, you first need to understand the technology. RTGI stands for Ray Traced Global Illumination.

In standard game lighting, developers typically use "baked" lighting (static shadows that don't move) or rasterized lighting (fast but less realistic). Global Illumination (GI) simulates how light bounces off surfaces. If you shine a red flashlight on a white wall, the reflected light should cast a red glow on the floor. That is GI.

RTGI, specifically the shader developed by Pascal Gilcher (commonly known as "Marty McFly" in the modding community), uses ReShade to inject real-time ray tracing into almost any DirectX 9, 10, or 11 game. This allows gamers to add modern lighting effects to titles like Grand Theft Auto V, The Witcher 3, or older classics like Mass Effect, transforming their visual fidelity.