https://wccftech.com/classic-doom-ray-tracing/

The very first entry in the DOOM series features dated visuals, but they still can look quite impressive with the addition of ray tracing.

Sultim_t, who also added ray tracing via path tracing to Half-Life and Serious Sam The First Encounter shared today on their YouTube channel a new video that shows the very first entry in the series created by id Software running with real-time path tracing, achieving visual effects that are as close as possible to actual ray tracing. The video also provides a quick comparison with the vanilla version, which makes the updated visuals look even more impressive.