From: "Walter Soyka" <AE-List@media-motion.tv>
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In-Reply-To: <list-5797644@media-motion.tv>
References: <list-5797644@media-motion.tv>
Date: Thu, 23 Jul 2015 19:30:04 -0400
Message-ID: <CAEcMUeQidS6Z5-k2seL6d6KOTaseR=4DHMpyuh2WUPs+gCsw-Q@mail.gmail.com>
Subject: Re: [AE] 3 points to establish a plane
To: After Effects Mail List <AE-List@media-motion.tv>
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I keep meaning to add this to my 3d-layer-tools script, but I posted the
expressions to do this here:

https://forums.creativecow.net/thread/2/1053700

You may need to translate to world space or vectors depending on what
parenting you have going on, but that should get you started.

w.
On Jul 23, 2015 6:27 PM, "Byron Nash" <AE-List@media-motion.tv> wrote:

> What's the math to determine a plane based on three nulls in 3D space? I'd
> like to replicate the functionality of the built in tracker and be able to
> select three nulls and get a layer that sits on that plane in space. I
> figure it can be done with expressions and the pointAt() function but I'm
> not sure how to get the 3rd dimension.
>
> Thanks
> Byron
>

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<p dir=3D"ltr">I keep meaning to add this to my 3d-layer-tools script, but =
I posted the expressions to do this here:</p>
<p dir=3D"ltr"><a href=3D"https://forums.creativecow.net/thread/2/1053700">=
https://forums.creativecow.net/thread/2/1053700</a></p>
<p dir=3D"ltr">You may need to translate to world space or vectors dependin=
g on what parenting you have going on, but that should get you started.<br>=
</p>
<p dir=3D"ltr">w.</p>
<div class=3D"gmail_quote">On Jul 23, 2015 6:27 PM, &quot;Byron Nash&quot; =
&lt;<a href=3D"mailto:AE-List@media-motion.tv">AE-List@media-motion.tv</a>&=
gt; wrote:<br type=3D"attribution"><blockquote class=3D"gmail_quote" style=
=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir=
=3D"ltr">What&#39;s the math to determine a plane based on three nulls in 3=
D space? I&#39;d like to replicate the functionality of the built in tracke=
r and be able to select three nulls and get a layer that sits on that plane=
 in space. I figure it can be done with expressions and the pointAt() funct=
ion but I&#39;m not sure how to get the 3rd dimension.<div><br></div><div>T=
hanks</div><div>Byron</div></div>
</blockquote></div>

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