There were several other games that used volumetric shadows before Doom 3, AFAIK...

badsectoracula on April 10, 2022 | parent | context | favorite | on: 3D Software Rendering Technology of 1998's Thief: ...

There were several other games that used volumetric shadows before Doom 3, AFAIK Neverwinter Nights and Morrowind are two. Even id's own Quake 3 (enabled by a console command) used it though it was a bit buggy.