AE6 Overview Part 4: Multipoint Tracking
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Step 6: In the Tracker Control Palette change the Track Type from Transform to Perspective Corner Pin.

[an error occurred while processing this directive]You should also see that the single Tracker Point in the Layer Window has been replaced with four Tracker Points each connected by a line. These lines are connected to the Anchor Points and will help you outline the position of your target layer.



Step 7: Position and size the Track Points in areas that have the best contrast. When you have placed the Track Points, click and drag the Anchor Points so they are anchored to the side of the building.

Each of the four Track Points can be placed anywhere on the screen to track data (Yellow indicates Feature Region, while purple indicates Search Region, while the four Anchor Points (Red) should be placed in the areas where the target layer will be located.


Note: There is not one absolute are that the Track Points should be situated. It will depend on the footage and how well After Effects calculates the tracked data.

For this particular piece of footage, it may be necessary to actually move the Track Point Feature and Search region boxes throughout the tracking process to ensure you don’t get drift. For this exercise I had to move the Track Points to different locations to get the most stable track.

At around 5:00 I had to reposition several of the Track Points to ensure the Anchor Points stayed in place. You may find you need to do this during the Analysis portion of the exercise. Do not move the Track Points until after you have begun the analysis.


Step 8: With the Track Points and Anchor Points in position, click on the Options button in the Tracker Controls. Since the DV footage is automatically de-interlaced when it is brought into After Effects, you will not need to Track Fields. And, because of the nature of the footage, you do not need to Enable Feature Adaptiveness either.



Step 9: Click on the Tracker Plug-in Options Button. Make sure Use Channel is set to Luminance and that Subpixel Positioning is turned on and click OK.





Source: Digital Media Online, Inc.
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