Ripping from Steam games? (SA2)

I'm trying to figure out how to rip the Chao models from the Steam version of Sonic Adventure 2. I tried using Ninjaripper, but it only saved the textures -- the "frames" folder is empty. 3DRipperDX didn't run at all; it doesn't seem to be compatible with the game. Does anybody have any suggestions? A "printscreen" ripper would probably be the best, but I haven't found any that work yet.

Alternatively, would it be better/easier to rip from the GameCube version instead?

Thanks!