dark10x said:So can you actually explain the original issue here? Why does 60 fps look better than 120 fps (even if just by a tiny bit)?
I've never observed this so as far as I'm concerned it doesn't exist. 120fps isn't really going to look any more believable than 60fps without motionblur.
That isn't true, though...
Take a look at the video intro of Gran Turismo 3, for instance. As you can clearly see, motion blur is present in the same way as we encounter it in CG films. This video, however, displays at 60 fps. At 30 fps, even with motion blur, it still wouldn't look as smooth. 30 fps will become much more acceptable, to be sure, but 60 fps will still be optimal...
GT3 doesn't have physically correct motion blur at all. Motion blur in videogames at this point is nothing more than a stylistic effect.
The ideal solution would be to choose whatever framerate would best simulate how the eyes perceive motion blur (since the amount of blur coresponds to the framerate, the higher the framerate the less blur). Assuming you wanted to emulate the human eye. I wouldn't be suprised at all if "cinematic" games in the future locked their framerate to 24fps with motion blur.