This tool extracts a map from a WAD file and writes it to a glTF file. It created one glTF Node and Mesh for each sector, and creates up to three Primitives for each sidedef (upper, middle, and lower). It also extracts the textures from the WAD and converts the textures to PNG
This tool exports THINGS. It places them at a height of 0
This tool add glTF extras to Nodes for sectors and things. The extras has a type field and a data field. The type is the type of Node - 0 for Thing, 1 for Sector. The data is the data for that type. Things have a Thing type and some flags, sectors have a light level, a special type, and a tag number
This tool does not export any of the original culling information, and it's not likely to. Modern computers are able to render an entire DOOM level with ease
I've tested this on the DOOM WAD included with the DOOM 3 BFG edition. I expect it to work for any DOOM or DOOM 2 WAD, so please report any bugs you find with those. However, this tool does not support DOOM 64, Hexen, Heretic, Strife, or other id Tech games. Their WAD formats are too different