After downloading a million 15 year old abandonware windows-only applications I was able to port the city scanner from HL2 to HL1 with near-zero loss in fidelity (just minor changes in the skeleton). The mesh and texture is identical to the full quality HL2 version in the vanilla HL1 engine, if you put aside that 512x512 was an optional feature reserved for cards such as the geforce2, unlike the 256x256 plebs with 3dfx cards.