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In-Reply-To: <list-5289145@media-motion.tv>
References: <list-5289145@media-motion.tv>
From: Robert Kjettrup <robert@stvmayday.dk>
Date: Tue, 19 Nov 2013 21:49:48 +0100
Message-ID: <CAFu=taZPtqKPXKO3EjhLPZrtE2FT8VceyZx4Vfrpvi-_PVPyHQ@mail.gmail.com>
Subject: Re: [AE] Expression to orient a layer to same direction a Camera
To: After Effects Mail List <AE-List@media-motion.tv>
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Ok... i got the paralell orientation to work like i wanted, but have now
stumbled over another problem related to this.

I now need it to work with the camera parented to a null. Should be
relatively simple, right?
use toWorld to get the absolute position of the camera set as a child of
the 3d null, or that is how i understood that toWorld worked. But i cant
get it to return the correct values.
Put the following expression on a 3d Point Control on any layer, and have a
3d camera parented to a 3d null.

cam = thisComp.activeCamera;
cam.toWorld(cam.position)

this gives back some position that seems totally wrong.
I have tried toWorld, fromWorld, toWorldVec... etc and nothing gives back
the absolute position of the camera in the world space.
Is there something i just dont understand with this, or???

- Robert



2013/11/18 Robert Kjettrup <robert@stvmayday.dk>

> doh...!!!
> Dead simple when i figured it out.
>
> Just use the built in expression function LookAt, but put in the camera
> position and its target into the fromPoint and atPoint instead of the
> layers own position and the camera position.
> Of course i figure this out soon after i had sent the mail before after
> having struggled with way too complex expressions :-D
>
> just a head-up to anyone that might find this useful info :-)
>
> - Robert
>
>

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<div dir=3D"ltr"><div class=3D"gmail_extra"><div class=3D"gmail_extra" styl=
e=3D"font-family:arial,sans-serif;font-size:13px">Ok... i got the paralell =
orientation to work like i wanted, but have now stumbled over another probl=
em related to this.</div>

<div class=3D"gmail_extra" style=3D"font-family:arial,sans-serif;font-size:=
13px"><br></div><div class=3D"gmail_extra" style=3D"font-family:arial,sans-=
serif;font-size:13px">I now need it to work with the camera parented to a n=
ull. Should be relatively simple, right?</div>

<div class=3D"gmail_extra" style=3D"font-family:arial,sans-serif;font-size:=
13px">use toWorld to get the absolute position of the camera set as a child=
 of the 3d null, or that is how i understood that toWorld worked. But i can=
t get it to return the correct values.=A0</div>

<div class=3D"gmail_extra" style=3D"font-family:arial,sans-serif;font-size:=
13px">Put the following expression on a 3d Point Control on any layer, and =
have a 3d camera parented to a 3d null.</div><div class=3D"gmail_extra" sty=
le=3D"font-family:arial,sans-serif;font-size:13px">

<br></div><div class=3D"gmail_extra" style=3D"font-family:arial,sans-serif;=
font-size:13px"><div class=3D"gmail_extra">cam =3D thisComp.activeCamera;</=
div><div class=3D"gmail_extra">cam.toWorld(cam.position)<br></div></div><di=
v class=3D"gmail_extra" style=3D"font-family:arial,sans-serif;font-size:13p=
x">

<br></div><div class=3D"gmail_extra" style=3D"font-family:arial,sans-serif;=
font-size:13px">this gives back some position that seems totally wrong.</di=
v><div class=3D"gmail_extra" style=3D"font-family:arial,sans-serif;font-siz=
e:13px">

I have tried toWorld, fromWorld, toWorldVec... etc and nothing gives back t=
he absolute position of the camera in the world space.</div><div class=3D"g=
mail_extra" style=3D"font-family:arial,sans-serif;font-size:13px">Is there =
something i just dont understand with this, or???</div>

<div class=3D"gmail_extra" style=3D"font-family:arial,sans-serif;font-size:=
13px"><br></div><div class=3D"gmail_extra" style=3D"font-family:arial,sans-=
serif;font-size:13px">- Robert</div><div class=3D"gmail_extra" style=3D"fon=
t-family:arial,sans-serif;font-size:13px">

<br></div><div class=3D"gmail_extra" style=3D"font-family:arial,sans-serif;=
font-size:13px"><br></div><br><div class=3D"gmail_quote">2013/11/18 Robert =
Kjettrup <span dir=3D"ltr">&lt;<a href=3D"mailto:robert@stvmayday.dk" targe=
t=3D"_blank">robert@stvmayday.dk</a>&gt;</span><br>

<blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-=
left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;p=
adding-left:1ex"><div class=3D""><div class=3D"h5"><div dir=3D"ltr">doh...!=
!!<div>

Dead simple when i figured it out.<br></div><div><br></div><div>Just use th=
e built in expression function LookAt, but put in the camera position and i=
ts target into the fromPoint and atPoint instead of the layers own position=
 and the camera position.</div>



<div>Of course i figure this out soon after i had sent the mail before afte=
r having struggled with way too complex expressions :-D</div><div><br></div=
><div>just a head-up to anyone that might find this useful info :-)</div>



<div><br></div><div>- Robert<br></div><div class=3D"gmail_extra"><div><br><=
/div></div></div></div></div></blockquote></div></div></div>

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