Credit for Video: https://www.youtube.com/channel/UCfqBVrn2sqek-bfvXyZxkxQ
" This video shows new features of my GPU (NVIDIA Titan Xp) pathtracer built in to Quake 2. All lighting is computed on-the-fly with the use of raytracing. In comparison to previous videos which were playbacks of recorded game sessions, this video is composed of live sessions played by myself. "
More information: http://amietia.com/q2pt.html
Source code: https://github.com/eddbiddulph/yquake2/tree/pathtracing