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From: Jeff Krebs <rockinjeff@gmail.com>
Date: Thu, 6 Mar 2014 06:22:01 -0500
Message-ID: <CA+vzkUBxzL-aRNt9Kva1i-WhunczZxQO1nysOhTiWH41ZPvdow@mail.gmail.com>
Subject: Re: [AE] Using optical flow to speed up 3D renders
To: After Effects Mail List <AE-List@media-motion.tv>
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Optical flow has it's uses but for the process of 3d rendering. We use
oflow for the obvious and not so obvious.
speed is obvious *everyone does that*.

For other use We generate an oflow to solve

   - stabilization mapping vectors to color channels combing expression to
   achieve stabilization
   - Rolling Shutter utilizing the backward motion vectors to calculate the
   source coordinate of the source of each pixel rolling shutter
   - Fixing missing frames ... of course
   - morph combining and slowing motion vectors from one image to another.

Utilizing and render depth pass is great for depth blur and basic
out-of-the-box fog but try *world position pass *(to define every pixel
cooridate in 3d space) to render environmental effects like volumetric fog
with ray casting or fixes to 3d renders using volume masking with data
derived from the world position pass That's a huge timesaver.
From hours per frame to *frames per second.*

cheers
Jeff

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<div dir=3D"ltr"><div class=3D"gmail_extra">Optical flow has it&#39;s uses =
but for the process of 3d rendering. We use oflow for the obvious and not s=
o obvious.</div><div class=3D"gmail_extra">speed is obvious <u>everyone doe=
s that</u>.=A0</div>

<div class=3D"gmail_extra"><br></div><div class=3D"gmail_extra">For other u=
se We generate an oflow to solve=A0</div><div class=3D"gmail_extra"><ul><li=
>stabilization mapping vectors to color channels combing expression to achi=
eve stabilization<br>

</li><li>Rolling Shutter utilizing the backward motion vectors to calculate=
 the source coordinate of the source of each pixel rolling shutter<br></li>=
<li>Fixing missing frames ... of course</li><li>morph combining and slowing=
 motion vectors from one image to another.</li>

</ul><div>Utilizing and render depth pass is great for depth blur and basic=
 out-of-the-box fog but try <b>world position pass </b>(to define every pix=
el cooridate in 3d space)=A0to render environmental effects like volumetric=
 fog with ray casting or fixes to 3d renders using volume masking with data=
 derived from the world position pass That&#39;s a huge timesaver.</div>

<div>From hours per frame to <b>frames per second.</b></div><div><b><br></b=
></div><div>cheers</div><div>Jeff</div></div><div class=3D"gmail_extra"><br=
></div></div>

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