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Motion Tracking, Incorporate a Title into Scene
I’m making a short web promo to advertise a catalog we’ve got coming out. The cover is a super tight shot of a baseball cap with white text. I’d like to shoot a similar shot of a baseball cap, hand held, with the same title text appearing 2-3 inches in front of the cap. I’ve got a basic understanding of tracking, but just enough to get me in trouble.
I tried several ways of tracking. This example is with “Perspective corner pin” with Position, Rotation, and Scale all clicked on. I applied the tracing to a null and then the text layer is a child of the null. I also tried it without the null and it didn’t seem to make a difference, except that the text was squished.
This is just a test shot to see if the idea would work.
What do you guys think? I’m sure I’m missing something simple.
I’m using AE CS3 on a Mac.
Thanks
Corbin Gross
Creative Services
Marketing
SanMar Corp. -
3 Replies
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Ok, so let’s start:
1. If you use “perspective corner pin” method – you can’t apply the results to null, because it won’t do what it supposed to. What do you get from applying “corner pin” effect to the null? Nothing. You have to apply your results directly to the footage.
2. If you have problems with dimensions of your footage – precompose it and play with the scale of the layers in nested comp, and the size of that comp.
3. Make sure you have your scene set up correctly: take a look at the positions of your pencils. Aren’t they a bit further from the camera, than the surface you want your text to appear on?
4. I would’t use “perspective corner pin” for that in a first place.
I’d rather use simple track with position, rotation and scale without any pencils. Try to attach your tracks to where peak is attached to the cap.(Hope you know what I mean… English… well, it’s not my native language)
Bartek Skorupa
Warszawa, Poland -
I used the regular track like you suggested and it’s much better. It’s still not perfect, a little jittery, but it doesn’t need to be exact.
Let’s say I did want it perfect though. The jitter seems to be about 1-2 pixels. How do you set up your tracking options? I imagine there’s some subtlety there that takes years of experience to finesse.
Corbin Gross
Creative Services
Marketing
SanMar Corp. -
if you’re just tracking and not messing with roto, you can go to tracker option and select “track fields”. That will make it more stable. Another way to do this is…
example:
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1. drop a 29.97 interlaced into a 59.94 composition.
You can now track precision-wise down to field level. This reduces jumps in tracking, roto.2. drop roto comp back into 29.97 comp. turn on Field Render in the Render Settings. ]
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You also want sub-pixel positioning on
and decide between rgb and luminance tracking, test each.
Drag outer box bigger. It will take longer to track but will be 10x more accurate.
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