Nitpicking, but for GP; Nerf is the internal representation, but the output doesnt have to be 2D (ray traced basically)

There are examples of people outputting SDF (and by extension geometry) with nerf, and projecting original texture onto that would give some nice effects; (live volumetric works best this way) though there would be some disparity where edges/occlusion isnt perfect, so youd want to sample nerf's rgb anyway... although a lot of that is fuzzy at the edges too. A lot of incorrect transparency at edges looks great in the 2D renders (so much anti aliasing and noise!) but less good for texturing