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Date: Wed, 18 Oct 1995 13:00:34 -0400 (EDT)
From: Robert Cohen <[e-mail]>
To: Kier Darby <[e-mail]>
Cc: Lightwave Post <[e-mail]>
Subject: Re: FR
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On Wed, 18 Oct 1995, Kier Darby wrote:

> With all this talk about field rendering at the present, I'd like to pose
> a REALLY nerdy question and ask someone to explain in plain English quite
> what FR achieves...
>
> Anyone?

No question is a nerdy one ;)  Video frames are comprised of two "sub
frames" called fields.  In order to simulate smooth movement, the two
fields are "interlaced" together and essentially provide twice the
movement information as a single frame with like fields.  This is why you
will see jittering images when viewing a still frame which has been
rendered with field mode on, if it contained fast mostion which is near
the camera.  You would see the same flicker contained in a frame grab of
live video if the motion was fast and near the camera.  In fact, this is
what the motion removal function of the Video Toaster deals with when
averaging out the image information contained in such a video grab.

So, if you are going to animate an object which passes horizontally past
your virtual camera, and this object is relativly near the camera, you
would most likly benefit from the use of FR ;))

I hope this helps


***************************************************************************

Robert Cohen / Ocean Township NJ    Lightwave Animator / Video Editor

          [e-mail] / [e-mail]

***************************************************************************

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