: This is a very "heavy" shader. Expect a significant drop in FPS (often 20-40% ) depending on your resolution and GPU power.
The file typically refers to a collection of Marty McFly's RTGI (Ray Traced Global Illumination) shaders for ReShade, released on March 4, 2023 . This specific pack is a popular version of the "iMMERSE Pro" suite created by Pascal Gilcher, which allows players to add advanced screen-space ray tracing effects to almost any DX9, DX10, DX11, DX12, or Vulkan game. 🛠️ What’s Inside the Pack? RTGI_Pack (03-04-2023).zip
: Look-up tables (LUTs) or noise textures used for jittering and denoising the light rays. : This is a very "heavy" shader