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From: [e-mail] (Ken VanBrocklin)
To: [e-mail] (Lightwave)
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Organization: Alliant Techsystems, Inc.
Date: Mon, 23 Oct 1995 08:54:50 -0700
Subject: Re: FR
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Richiard Addison writes:

In responce to my post:

>   I have gotten away from using field rendering. It was reccomended to me
> some time ago to start using motion blur instead. You still get smooth
> looking motions but dont get the artifacting that comes with FR.

RA>What artifacting are you referring to?

  I probably could have chosen a better term than artifacting. The problems
I noticed using FR was when objects in my scene were moving really fast
(like shock waves from explosins and  fast cars) would still have jerky
motion. Most noticable was the shock wave. When using FR, as the size of the
shock wave expanded, it had sharp edges between each feild, when moving fast
they these edges seemed to strobe. When I switched to motion blur,(using a
80% blur length) the expanding wave was seemless and smooth. Also in the
same scene I had a cobblestone street with brick buildings. When the camera
was pulled way back and I started to zoom in on the street corner scene, the
moray patterning caused by the fine lines on the building's and the
cobblestone street was dancing aroung like crazy. Motion blur helped smooth
out this effect some but I needed to turn on soft filter to get rid of 90%
of the morey pattern.  BTW fractial noise can also cause this effect.
  Since then I have been using motion blur on most of my animations and have
not noticed any unsmoothness in the motion of objects. You still need to
determine which is best for your application and allowed rendering time.

   As far as using FR vs Motion blur, Mark Thompson wrote a article in the
March 95 LW Pro titled "All about antialiasing". This article came out right
when I was experincing these problems and gave me the solution to my
problems. It was also verry informitave on the up's and down of both
rendering methods.  I dont want to infringe on copywrited material so Mark
will have respond further reguarding this. The section of the article I am
refering to is when he talks about temporal aliasing, which is what FR and
motion is all about.

--
[e-mail] (Ken VanBrocklin) sent this message.
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