ripping PSX models

i want to rip models from PSX games using pSX, because thats the only emulator that can measure the depth of PSX polygons (even though PSX doesn't have a Z-Buffer), but how do i convert VRAM data into a usable mesh like .obj or .3ds? i would really like to expand the PSX category on TMR a bit.
the games are:
The Land Before Time: Big Water Adventure (a request by DigiPonytheDigimon on dA)
Spyro 3: Year of the Dragon
Carrmageddon (original 1996 release)
Nicktoons Racing
Dance Dance Revolution 2ndMix (just the trippy backgrounds)