https://wccftech.com/doom-eternal-restored-graphics-effects-shadows/

Since its release a few weeks back, the DOOM Eternal Restored Graphics Effects mod received a couple of updates that introduce new options, including one that enables ray tracing through ReShade with the Pascal Glitcher's Ray Tracing plugin.

The latest version of the mod, 1.51, features, alongside the ReShade with ray tracing option, which also features tweaked values for Pascal Glitcher's Ray Tracing plugin to enable much better shadows, the ability to increase the distance at which light sources are rendered, the ability to increase the resolution of shadows cast by the sun, and many more. Changing these options will have an impact on performance.