| KillerMan said: Why they can't make game with 45fps? It would play smoother than 30 but you could use better graphics than with 60. |
Video modes of displays are usually a multiple of 60hz, ie they refresh the screen 60 times per second (or 120). The graphic triies to be a submultiple of this number: with 60 fps you push one frame per vertical refresh, with 30 fps you try to push one every two refreshes. If you go out of sync you get screen tearing because a single screen refresh gets part of a frame and part of another.
If you chose weird fractions such as 45fps and still wanted to avoid tearing you should do something like frame/frame/frame/pause / frame/frame/frame/pause/ ... where each step is a screen refresh. This way you end up producing frames only in 3/4 of the screen refreshes ( 3/4 of 60Hz gives your 45 fps).
But, and it's a great but, this framerate is not uniform as you have three close frames, then a longer pause, then another three close again etc, It would produce visible jittering in animations, scrolling, camera pans etc.
