AE6.0 Overview Part 3: Motion Tracking
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Tracking the right hand will be a bit more problematic because the hand crosses the actor’s neck, which happens to have the same RGB values of the hand. When you are tracking this element, you will have to do the following to correct the problem:
- As soon as the Track Point looses lock with the finger, stop the Analysis. [an error occurred while processing this directive]
- In the Layer Window move the Time Marker to the last good track position.
- Reposition the Track Point so it is in the proper location.
- Click on the Analyze 1 Frame Forward button.
- Reposition the Track Point.
Repeat the process until the Track Point stays locked to the finger. When that happens, you can click on the Analyze Forward button once more.
The finger will cross the neck a second time, so you will need to do the singe frame analysis process one more time.
When you are finished, you should have something that looks like the following. For fun you can even apply a wiggle expression to the buttons to give them a more lifelike feel. If you have forgotten (or don’t know) how to add a wiggle expression, you can read that tutorial here. I intentionally shot this footage against a blue screen for those of you who wish to practice your keying. You can read my rather lengthy blue screen tutorial here, or wait for a future AE6 installment where we will look at the new keying effect – Keylight.
| The Final Composition |
From this exercise, you should now feel comfortable tracking a single point to a layer. In the next installment, we’ll do multi-part tracking, which will allow us to place CG signs on moving cars, buildings, and the like.
When not working deep in the labs of the DMN Central Division testing the latest and greatest software/hardware products Stephen Schleicher can be found at the local university teaching a few courses on video and web production. He can be reached at schleicher@mindspring.com. You can also visit him on the web at www.mindspring.com/~schleicher where he has a growing list of his many tutorials.
Source: Digital Media Online, Inc.
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