[londons_explore]

Remember that to remove aliasing (spatial and temporal), you want no frequencies above the nyquist rate.

Typically, anti-aliasing uses an average of multiple samples across the width of the pixel (MSAA), or across the timespan of the frame to eliminate this.

That is in fact a rectangular function in the time/spatial domain. Which is wrong. A rectangular function reduces rather than eliminates the frequency components above the nyquist rate, and also attenuates frequencies near but below the nyquist rate (leading to blur).

In fact, you want a rectangular frequency domain function, which in the spatial/time domain is a sinc function.

This isn't done in real cameras because it is technically too hard, but in 3D rendering, it should be done, and will produce smoother animations.

I have never seen anyone do this, but results should be theoretically better. I’d also like to see a freeze frame of a sinc time domain sampled motion blur - it would probably look very weird, even though it looks good at the playback rate.