>>> The only way I can think of doing this is to just rerender the entire 
>>> frame multiple times - which would obviously not work in realtime. So
> 
>> That's one way of doing it, and it works ok if your scene is simple enough, 
>> or if you only want to motion blur certain parts of it (eg a fast moving 
>> missile).
> 
>   Note that antialiasing also is based on rendering the frame multiple
> times (although current cards might have some tricks to reduce the amount
> of required rendering).

nVidia claims their full-frame AA works by just rendering the entire 
thing to a larger framebuffer and downsampling with smoothing, but their 
faster "smart AA" works by using filtered texturing, and does AA only at 
polygon edges (using something like Bresenham's algorithm I would think, 
rather than actual supersampling, since a polygon edge is a straight line).

-- 
http://blog.orphi.me.uk/
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