🚀 go-pugleaf

In a previous article,
Re: Jerky Animation (Was: The Correct Way to Control Game Speed),
I discussed motion blur and a way to achieve it with sprites in a simple
case.  I mentioned that motion blur is the best possible approximation
for the human eye to true visual motion.  I should qualify this a little.

If you consistently follow a motion-blurred object with your eye as it
moves across the screen, it will not look particularly better than
a non-blurred moving object.  The win of motion blur is when your mind
is following the object but your eye is fixed, which is what will
usually happen when you view an animation.

The reason that motion-blur is right is that your eye is a
continuously open camera; it has no oscillating shutter as movie
projectors or high-speed cameras do.  The persistence of an image
in your retina is about a tenth of a second, and the only way
your mind knows that an object in your field of vision is moving is
that its image is blurred.  Your mind de-blurs the image.  An unblurred
moving object in an animation makes the image processing in your head
think that the object is changing position without moving.