Re: AN interesting comment.

New Message Reply Date view Thread view Subject view Author view

Mike Weiblen (mew++at++paradigmsim.com)
Thu, 16 Jan 1997 16:51:35 -0600

The double framing would seem to invite temporal aliasing,
which is perhaps perceived as a motion blur??

-- mew

Steve Baker wrote:
>
> I found this interesting comment in a document in Jim Blinn's home page
> out there on the web:-
>
> > A common cheat in animation is to do double framing, that
> > is, to only render every other frame and to record each rendered frame
> > twice. We all expect that single framing is preferable to double framing,
> > its only disadvantage is that single framing takes longer to render.
> > There is another effect of double framing however. A motion that is
> > double framed seems to move faster than one that is single framed,
> > even if they take an identical amount of wall-clock time to take place.
> > Double framing is therefore sometimes used by conventional animators
> > to add liveliness to scene.
>
> This seems very suprising - if it's true then it would appear to have
> rather severe implications for simulations running at 30Hz. If time
> somehow seems distorted in this way then vehicle operators (pilots
> especially) might get false speed cues with 30Hz simulations!
>
> Has anyone else out there heard this? Are there studies to show any
> kind of effect like that?
>
> Mr Blinn is presumably too busy to answer his email - I didn't get a
> reply when I asked him for backup info.
>
> Steve Baker 817-619-1361 (Vox-Lab)
> Hughes Training Inc. 817-619-8776 (Vox-Office/Vox-Mail)
> 2200 Arlington Downs Road 817-619-4028 (Fax)
> Arlington, Texas. TX 76005-6171 Steve++at++MrEd.bgm.link.com (eMail)
> http://www.hti.com (external) http://MrEd.bgm.link.com/staff/steve (intranet)
> http://web2.airmail.net/sjbaker1 (external)
>
> "You can't destroy the Earth - that's where I keep all my stuff!" - The Tick.

-- 
Mike Weiblen                  talkto:972-960-2301 x292
PARADIGM Simulation, Inc.     faxto:972-960-2303
14900 Landmark, Suite 400     mailto:mew++at++paradigmsim.com
Dallas TX 75240               http://www.paradigmsim.com
=======================================================================
List Archives, FAQ, FTP:  http://www.sgi.com/Technology/Performer/
            Submissions:  info-performer++at++sgi.com
        Admin. requests:  info-performer-request++at++sgi.com

New Message Reply Date view Thread view Subject view Author view

This archive was generated by hypermail 2.0b2 on Mon Aug 10 1998 - 17:54:21 PDT

This message has been cleansed for anti-spam protection. Replace '++at++' in any mail addresses with the '@' symbol.