Vanillaccurate is the original pack from HARDTOPnet.

It is a pixel-vanilla-styled pack with lots of details to be used with custom shader packs.
It keeps the vanilla aesthetics but has very detailed features with shadows, highlights, reflections, depth.

It uses very detailed PBR maps for specular reflections and material simulation, as well as light emission, ambient occlusion, translucency, and porosity.

Some items and entities are also included:

Vanillaccurate also offers Bedrock (RTX) and Pocket (OSBES, YSS, ...) versions!

A whole range of resolutions is offered, from 16x up to 512x (and even 1K and 2K at some point).