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From: ritter@versatc.versatec.COM (Jack Ritter)
Newsgroups: comp.graphics
Subject: Motion Blur
Keywords: Temporal aliasing, frames, physiology, cameras.
Message-ID: <20921@versatc.versatec.COM>
Date: 3 Aug 90 22:55:09 GMT
Organization: Versatec, Santa Clara, Ca. 95051
Lines: 49

About 5 years ago, I saw a Siggraph presentation
on computer animation. I forgot who the deliverer
was, but he showed a computer film of a complex,
stick & ball type molecule, rotating. First he
showed a version WITHOUT motion blur; all frames
were sharp. Then he showed a version WITH motion
blur. 

The upshot was: "Look how much 'smoother' the motion
blurred version is, as opposed to the 'stroboscopic'
effect of the non blurred version." 

Well, I LIKED the stroboscopic one 
BETTER than the motion blurred one.
It was simply crisper and more enjoyable than the
mushiness of the blurred version.

Some of the literature implies that it's good for
computers to immitate artifacts left over from
cameras, like motion blue (and depth-of-field.)
Of course, m.b. helps alleviate "popping fragments",
but this was not a factor in the molecule rendering.

Are there sound physiological principles that support
the need for motion blur? My eyes didnt seem to
need it, at least not at the frame/sec rate he showed.

Maybe there's another factor: We're so used to seeing
motion blur all our lives, from film & tv cameras, that when
you take it away, we MISS it.

----------------------------------------------------------------
(Personally, I think the eye-brain system behaves digitally AND
analogically, AND in accordance with all responsible, future
theories that ever come along.)

-- 
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