Match Move Four Corner
Replacing a billboard is a common task in motion tracking. Let's see how we can use the Match Move behavior to track the four points of a sign and replace it with another element.
Getting ready
Under this chapter's exercise files, double-click the 09_04
project. Playback the project. The animation consists of a family walking to a For Sale sign. We want to replace this with a For Rent sign (this is a still image layer that's been temporarily turned off in the project). To achieve this, we'll apply a Math Move behavior to the still image and select the Four Corner tracking as the type.
How to do it...
To attach For Rent to the sign, follow these steps:
Turn on the For Rent layer by clicking the empty box to the left in the Layers tab.
Select the video clip. Press Command + 2 to go to the Library. Go to Behaviors | Motion Tracking | Match Move. Click on Apply at the top of the Library. The behavior is added to the For Rent layer.
Make sure you're at the beginning of the project...