In-game, press the Home key, check the box for the shader you installed, and adjust the settings in the menu.
Ray-Traced Global Illumination (RTGI) transforms video game visuals by simulating how light naturally bounces off surfaces. While premium shaders like Pascal Gilcher’s Reshade RTGI (McFly RTGI) historically required a Patreon subscription, the shader community now offers incredible free alternatives.
If you find a legitimate old version, try these games immediately: