I have a problem where some textures appear with a strange triangular effect. I can't describe it well; please refer to the pictures below. The effect disappears either when I am moving toward or away from the object, or when I am close to object in-game.
PC Specs (yes this pc is ancient, and still going strong after almost 8 yrs =P ):
Windows XP 32 bit
Athlon XP 2100 1.73 ghz
1 gig ram
Nvidia Geforce TI4600 Driver ver: 6.14.10.9381
I was having the same problem with the original CD version of the game so I purchased the GOG version which didn't help anything.

I'd hazard a guess and say its probably your ancient ti 4600 thats causing the anomilies.

It's hard to imagine that the Graphics card is not involved. I tried adjusting all of the settings that the nvidia control panel allows for. I also tried every option that comes up before the game is launched.
I guess maybe I'll have to stick with the dreamcast version until I get a new computer.