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Cc: After Effects Mail List <AE-List@media-motion.tv>
From: Ross Shain <rosss@imagineersystems.com>
Subject: Re: [AE] How to handle complete obstruction of tracking object in mocha
Date: Thu, 12 Sep 2013 22:19:23 +0200
To: After Effects Mail List <AE-List@media-motion.tv>


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There are a couple mocha techniques to deal with tracking totally obscured a=
reas:

1. As Eric suggested, track up until the frame where it goes off, stop, move=
 your shape to any area where the motion is similar to the motion of the pla=
ne you are tracking. Track those frames until your original object comes bac=
k to frame, stop and move search area back. The point here is that animating=
 the search area does not throw off the surface.=20

2. Another method is to track until it goes off, them stop and skip the area=
 where the track is obscured. Skip ahead to area where object reappears and p=
ick up the track again. Next, enable manual surface which displaces ALL surf=
ace keyframes. Edit these to delete some unnecessary in betweens. You could a=
lternately use AE for the keyframe adjustment.

Hope this helps. If you want to post the shot,  we are happy to take a look.=
=20
Best,
Ross


Sent from my iPhone

On Sep 12, 2013, at 5:50 PM, Teddy Gage <teddygage@gmail.com> wrote:

> Hello, I have a very difficult tracking shot of a car that gets completely=
 obscured by a barrier for several frames during a tracking sequence, throwi=
ng off the mocha tracking data. This happens about six times during the shot=
. Now i could make make seven different tracking layers (ie a new layer betw=
een barriers each time) but this is tedious and makes syncing up the track d=
ata in ae very time consuming. Id prefer to do it all on one layer. Do I swi=
tch to a manual track during obstruction? Even adjusttrack cannot seem to co=
mpensate, as the entire object is obscured. Trying to track the barriers sep=
arately to exclude from the search area doesnt work very well either. Are th=
ere any tutorials about this? What would be the best way to approach this? M=
any thanks,
> TG
>=20
>=20
> --=20
> Animator & Editor
> www.teddygage.com
> Brooklyn
>=20

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<html><head><meta http-equiv=3D"content-type" content=3D"text/html; charset=3D=
utf-8"></head><body dir=3D"auto"><div>There are a couple mocha techniques to=
 deal with tracking totally obscured areas:</div><div><br></div><div>1. As E=
ric suggested, track up until the frame where it goes off, stop, move your s=
hape to any area where the motion is similar to the motion of the plane you a=
re tracking. Track those frames until your original object comes back to fra=
me, stop and move search area back. The point here is that animating the sea=
rch area does not throw off the surface.&nbsp;</div><div><br></div><div>2. A=
nother method is to track until it goes off, them stop and skip the area whe=
re the track is obscured. Skip ahead to area where object reappears and pick=
 up the track again. Next, enable manual surface which displaces ALL surface=
 keyframes. Edit these to delete some unnecessary in betweens. You could alt=
ernately use AE for the keyframe adjustment.</div><div><br></div><div>Hope t=
his helps. If you want to post the shot, &nbsp;we are happy to take a look.&=
nbsp;</div><div>Best,</div><div>Ross</div><div><br></div><div><br><br>Sent f=
rom my iPhone</div><div><br>On Sep 12, 2013, at 5:50 PM, Teddy Gage &lt;<a h=
ref=3D"mailto:teddygage@gmail.com">teddygage@gmail.com</a>&gt; wrote:<br><br=
></div><blockquote type=3D"cite"><div>Hello, I&nbsp;have a very difficult tr=
acking shot of a car that gets completely obscured by a barrier for several&=
nbsp;frames during a tracking sequence, throwing off the mocha tracking data=
. This happens about six times during the shot. Now i could make make seven d=
ifferent tracking layers (ie a new layer between barriers each time) but thi=
s is tedious and makes syncing up the track data in ae very time consuming. I=
d prefer to do it all on one layer. Do I&nbsp;switch to a manual track durin=
g obstruction? Even adjusttrack cannot seem to compensate, as the entire obj=
ect is obscured.&nbsp;Trying to track the barriers separately to exclude fro=
m the search area&nbsp;doesnt work very well either. Are there any tutorials=
 about this? What would be the best way to approach this? Many thanks,<div>
TG</div><br><br>-- <br><span style=3D"color:rgb(0,0,0)">Animator &amp; Edito=
r</span><br style=3D"color:rgb(0,0,0)"><span style=3D"color:rgb(0,0,0)"><a h=
ref=3D"http://www.teddygage.com" target=3D"_blank">www.teddygage.com</a></sp=
an><br style=3D"color:rgb(0,0,0)">
<span style=3D"color:rgb(0,0,0)">Brooklyn</span><br><br>
</div></blockquote></body></html>=

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