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Chris Mathews
3D Camera Tracker Tips
on Dec 17, 2012 at 2:31:51 pm

Hi guys!

I am trying to pin a screen shot into a monitor that is rotating on a turntable. I am attempting to do this in After Effects CS6, using the 3D Camera Tracker, but not having a lot of luck.

After analyzing the scene and dialing in my angle of view, I am picking some points and creating a Null & Camera. From there, I am dragging in my screen shot above my video layer, making it 3D and parenting it to the null. It is rotating correctly when I do this, but I need to size it into place. Any tips? Can I use the Corner Pin Effect? Or should I try something else.

I apologize is this is extremely basic, but I am very new to After Effects and I may have bit off more than I could chew on this.

Please help!


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Tom Daigon
Re: 3D Camera Tracker Tips
on Dec 17, 2012 at 3:34:04 pm

Camertracker is designed to work with shots that have camera movement in 3D space and create parallax for it to analyze.

Without seeing your images, I would speculate you need Mocha tracking. Mocha primary tracks objects.In this case the turntable. Post your clip and we can be more helpful.

If you have camera movement AND object movement, you can stabilize the shot in Mocha then track the monitor motion thus dealing with both.

Tom Daigon
PrP / After Effects Editor
http://www.hdshotsandcuts.com





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Roland R. Kahlenberg
Re: 3D Camera Tracker Tips
on Dec 17, 2012 at 4:17:25 pm

I'm actually doubtful that you've managed to obtain a workable track of the rotating monitor as AE's 3D Camera Tracker, in its current rendition isn't built for object tracking.

As Tom has pointed out, mocha will be a better bet for tracking the rotation (perspective change) of the monitor. With the rotating turntable in action, I assume that you will have more than one rotation. This will result in the tracking region, the monitor's screen area being totally obscured when it faces away from the camera.

You should, thus, break the tracking exercise into separate tracks, where each track is focused on its task of tracking as much as possible from a single rotation of the turntable.

You will likely have poor tracking results for a few frames when the angle of the monitor is too acute. You should however be able to manually adjust the keyframes in AE for those few frames.

Please avail yourself to the mocha tutorials at Imagineer's site if you are not too familiar with tracking in mocha and how to get the data into AE.

HTH
RoRK

Intensive mocha & AE Training in Singapore and Other Dangerous Locations

Imagineer Systems (mocha) Certified Instructor
& Adobe After Effects ACE/ACI (version 7)


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Chris Mathews
Re: 3D Camera Tracker Tips
on Dec 17, 2012 at 6:09:44 pm

I don't know anything about Mocha (yet), but here's a link to the rotating monitor that I am trying to embed a screenshot into:

password: agi
https://vimeo.com/55561608


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Tom Daigon
Re: 3D Camera Tracker Tips
on Dec 17, 2012 at 6:25:40 pm

Thats a PERFECT candidate for a Mocha 4 point track. Its free with AE. Go to the Imagineer site and learn how to do a 4 point track.

http://www.imagineersystems.com/videos?tagFilter=All&sortBy=Newest

Tom Daigon
PrP / After Effects Editor
http://www.hdshotsandcuts.com





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Chris Mathews
Re: 3D Camera Tracker Tips
on Dec 17, 2012 at 6:29:51 pm

It's free with AE? Really? That's awesome, I thought I would have to buy it. I really appreciate the help, I will check out the link and learn how to do it.


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Tom Daigon
Re: 3D Camera Tracker Tips
on Dec 17, 2012 at 6:32:22 pm

Yup, and when you highlight a layer this is how you access it.



Tom Daigon
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Chris Mathews
Re: 3D Camera Tracker Tips
on Dec 17, 2012 at 8:36:04 pm

Tom,

You have been incredibly helpful so far, thank you! Any chance this 4 corner pin you are referring to is called something else? When I go to the link you provided, I don't see any tutorial videos that talk about it. I also checked out Lynda.com and I find tutorials on tracking, but they all refer to screens that are just moving a bit and not rotating like mine.


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Tom Daigon
Re: 3D Camera Tracker Tips
on Dec 17, 2012 at 8:42:03 pm

Corner pin. BTW. Mocha Import Plus which is mentioned in some tutorials real makes working with Mocha and AE easier.

http://www.imagineersystems.com/videos?tagFilter=corner+pin&sortBy=Newest

Tom Daigon
PrP / After Effects Editor
http://www.hdshotsandcuts.com





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Chris Mathews
Re: 3D Camera Tracker Tips
on Dec 17, 2012 at 8:45:47 pm

Thank you! I am checking it now...


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Tom Daigon
Re: 3D Camera Tracker Tips
on Dec 17, 2012 at 8:47:34 pm

Good luck. Its a wonderful, powerful tool that has a bit of a learning curve. But well worth it.

Tom Daigon
PrP / After Effects Editor
http://www.hdshotsandcuts.com





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Chris Mathews
Re: 3D Camera Tracker Tips
on Dec 18, 2012 at 3:52:25 pm

Hi Tom,

I am learning a lot! I ran into an issue that I can't seem to resolve and I was wondering if you knew a solution.

After tracking in Mocha and exporting my tracking data into text file, I am doing the CC Corner Pin in AE and importing my tracking data using Mocha Import +, but after applying the tracking data, it is shrinking the screenshot.

Can't figure out why? When I watch this tutorial: , it mentions to choose Unstretch before applying the tracking data, but when I do, the screen is over scaled (but fits nicely within the tracking).

Any ideas?


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Tom Daigon
Re: 3D Camera Tracker Tips
on Dec 18, 2012 at 5:21:55 pm

Chris, Please post a link to the the clip you are referring to so I can see what you are doing.

Please clarify what you mean by screenshot. Are you referring to the shot of the screen rotating on the turntable OR the shot of the screen that will be placed into the rotating shot?

Tom Daigon
PrP / After Effects Editor
http://www.hdshotsandcuts.com





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Chris Mathews
Re: 3D Camera Tracker Tips
on Dec 18, 2012 at 5:36:38 pm

Here's a screenshot of what is happening. As you can see, after applying the tracking data, it shrinks my CC Power Pin screen shot.

Before


After


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Tom Daigon
Re: 3D Camera Tracker Tips
on Dec 18, 2012 at 5:42:58 pm

Is the shot being placed on the screen a full screen shot.

By that I mean, if your comp & tracking shot is 1920 x 1080, is the video being place on the screen the same size. I bet its not.

If this is the problem, take the footage and precomp it in a size that matches your main project.. Then stretch it to fill the full screen.Then apply the tracking data to the precomp.

I believe in MI+ there is a choice that does this for you automatically.

Tom Daigon
PrP / After Effects Editor
http://www.hdshotsandcuts.com





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Tom Daigon
Re: 3D Camera Tracker Tips
on Dec 18, 2012 at 6:13:41 pm

Just in case you havent seen it yet, this tutorial is a great intro that covers many aspects of using MI+. I watch it once a year.

http://www.mamoworld.com/index.php?option=com_content&view=article&id=297%3...

Tom Daigon
PrP / After Effects Editor
http://www.hdshotsandcuts.com





(Best viewed at 1080P and full screen)
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Chris Mathews
Re: 3D Camera Tracker Tips
on Dec 18, 2012 at 6:16:20 pm

That was it! The problem was that after watching the tutorials, I thought I had to add a CC Power Pin to my screenshot layer, adjust the 4 corners and then add the tracking data. If i just add the tracking data with a screenshot that has been pre-comped to be the same size, it fits perfectly.

Now I just need to get my tracking right and I will be golden.

Thanks Tom! I owe you a beer (or coffee).


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Tom Daigon
Re: 3D Camera Tracker Tips
on Dec 18, 2012 at 6:19:14 pm

Hey Chris, if I see you at NAB you are on for the beer!

Tom Daigon
PrP / After Effects Editor
http://www.hdshotsandcuts.com





(Best viewed at 1080P and full screen)
HP Z820 Dual 2687
64GB ram
Dulce DQg2 16TB raid


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