[Steve Crow] "Don't I instead want something on screen with tracking markers, particularly in the corners?"
Depending on the image, lighting, subject etc. you will actually want to have BOTH. The key is to make sure the original content doesn't come through, should the track slip a bit. AND that allows you to remove the image, but keep possible reflections that can be left in by using e.g. a Screen transfer mode. Something you obviously couldn't do if there is just a regular image behind it. But with a planar tracker such as mocha (which is also in TrackX from Coremelt) additional track-points are far less relevant than for a POINT tracker such as Motion's own.
[Steve Crow] "where in the plus sign do I want to place Motion's tracking/anchor point?"
It doesn't matter, as long as the subsequent track is good and et least very close to where the object (or corner) needs to be place later.
I would
highly recommend looking at TrackX (or even the bundle with SliceX):
http://www.coremelt.com/reviews/news/160-trackx-bundles-upgrades-and-tips.h... I think you'll see how much easier and precise they are in comparison.
But if it's not worth the investment to you, take a look at these for various tips and tricks on the subject, with the 2nd one probably being the most relevant for you:
- RK
____________________________________________________
Deutsch? Hier gibt es
ein umfassendes FCP X Training für dich!