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Can't seem to track game footage

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Josh Hughes
Can't seem to track game footage
on Feb 19, 2019 at 12:46:24 pm

Hi everyone, I've been using After Effects for about 7 years now, and with the latest Mocha update really confusing me, I can't seem to track a certain piece of footage...

I'm trying to track a piece of 3D text onto a plane in front of the train face. I've tried the 3D camera tracker but it won't solve the shot, motion tracking doesn't account for 3D, and I'm not even sure how I'd use the new Mocha AE CC to create a 3D track for me.

I've attached a video of my problems, please let me know what I'm doing wrong!







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Tero Ahlfors
Re: Can't seem to track game footage
on Feb 19, 2019 at 2:28:18 pm

Why do you need a 3D track? Would a corner pin be enough?


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Josh Hughes
Re: Can't seem to track game footage
on Feb 19, 2019 at 3:37:38 pm

Whatever works! I'm just not sure of the best, or any method, to get this to work. How would the corner pin work?


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Ross Shain
Re: Can't seem to track game footage
on Feb 19, 2019 at 5:55:02 pm

The bundled Mocha AE will be able to track the train's surface and you can apply the tracked data as a corner pin to a text element.

You can find many Mocha training videos here:
https://borisfx.com/videos/?tags=category:Mocha%20TV&search=

If you want to do a 3D camera solve, the Mocha Pro plug-in has a 3D solver, whereas the free Mocha AE is limited to 2.5D planar tracking. You can read the comparison chart here:
https://borisfx.com/products/mocha-pro/#compare

If you want to use the AE 3D Tracker, it is not optimized to track moving objects (like the train). It is really to created to track static elements such as ground, walls, etc. I have seen workarounds to trick the AE 3D tracker into tracking moving objects, but this requires masking.

The simplest thing to do would be Mocha AE and track the surface of the train. Make sure to use Mocha's "surface tool" to align your track to the train.

Best of luck.

Ross Shain
Boris FX / Imagineer Systems
https://borisfx.com/products/mocha/


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Josh Hughes
Re: Can't seem to track game footage
on Feb 20, 2019 at 9:46:44 am

Hi Ross, as you can see in the video I posted, I actually did track it in Mocha and try to apply corner pin data to the text object, but it just seems to create a mask around that area I tracked that I can't move the text out of...


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Ross Shain
Re: Can't seem to track game footage
on Feb 20, 2019 at 2:48:37 pm

The issue you are having is your corner pin is applied to a text layer, not a full frame layer. There are tutorials on this topic as well, but in general, the way AE applies corner pin is to the full frame (comp size).

So, first, you should position the Mocha surface exactly where you want it relative to the train onscreen inside Mocha (before creating the track data and applying it).

Next on your Text Layer, typically you would want to make the text quite big (fill the frame horizontally) and then pre-comp this layer before applying the track data. This way your Mocha tracked surface will match the insert position. You can test this by applying to a full frame solid instead of text layer. (same concept).

There are other ways to handle this:
Upgrade to Mocha Pro which has an insert module and 3D offsets to transform the insert.






or you can look at MochaImort+ which has some cool options for stabilizing the precomp OR offsetting the track with another set of keyframes. https://aescripts.com/mochaimport/

Hope this helps.

Ross Shain
Boris FX / Imagineer Systems
https://borisfx.com/products/mocha/


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