These gifs show the stages of surfacing in idtech. More explanation in the text below the images. Find more info on idtech 7's surfacing pipeline here: https://www.youtube.com/watch?v=UsmqWSZpgJY
and here:
http://advances.realtimerendering.com/s2020/RenderingDoomEternal.pdf
I was the surfacing lead on all levels seen in these pictures except Urdak. I oversaw the surfacing efforts of other artists on Cultist Base, Doom Hunter Base and Mars Core. For Mars Core, I also did many of the base materials and trim sheets.