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Perspective tracking overview

From: After Effects Apprentice 12: Tracking and Keying

Video: Perspective tracking overview

Next, we are going to tackle a more difficult tracking assignment, a corner pin track, where we need to track four objects in screen all at the same time. If you have access to the Exercise Files, in the Comps folder open up 04-Corner Pin*starter. I am going to RAM Preview this quick. What we have is a computer in an MRI facility, and let's say for some reason we wanted to replace that display. In this case just tracking one object isn't going to be good enough, because there is some slight perspective shift during the course of this shot.

Perspective tracking overview

Next, we are going to tackle a more difficult tracking assignment, a corner pin track, where we need to track four objects in screen all at the same time. If you have access to the Exercise Files, in the Comps folder open up 04-Corner Pin*starter. I am going to RAM Preview this quick. What we have is a computer in an MRI facility, and let's say for some reason we wanted to replace that display. In this case just tracking one object isn't going to be good enough, because there is some slight perspective shift during the course of this shot.

Therefore, we're going to need to perform some type of perspective track where we are looking at the corners of the screen individually so that we can warp a brand new layer to fit the perspective of this original display. I'll stop my Preview. Fortunately, the woman does not move in front of the monitor at any point of this shot, so we can pick anywhere to begin. I am going to go ahead and just for fun pick the end of the shot, just to give you experience doing something slightly different. Now, the one other thing you need to do before you go too far is add into this composition the new footage or layer you want to put over that monitor.

In the Exercise Files, go into the Sources folder, and we have a movie called Heart Monitor, which is a very simple animated display. This is something you might want to try your own hand in creating just for fun. Anyway, we are going to drag Heart Monitor into our composition with the MRI computer. It initially obscures the MRI computer shot, but don't worry, we are about to fit it onto the monitor in that underlying shot. Again, it's best to open up the layer you want to track in the Layer panel, but if you forget, don't panic, as long as you have the Tracker panel open and click Track Motion, After Effects will automatically open the Layer panel for you with the selected clip loaded in.

And to confirm that, the Motion Source is indeed the MRI computer movie. In the next movie we'll show you how to perform an actual perspective track, but first I have to warn you, this is the type of shot that After Effects is not very good at, because it has to do four different tracks independently and accurately. After Effects CS4 or later comes bundled with another application called a mocha from Imagineer Systems, which is far better at this type of tasks, but it's also more difficult to use. Fortunately, there's lots of resources out there on how to use mocha, but for now we are going to attempt this with After Effects' own built-in Tracker.

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After Effects Apprentice 12: Tracking and Keying

39 video lessons · 14065 viewers

Chris Meyer and Trish Meyer
Author

 
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  1. 9m 2s
    1. Welcome
      2m 38s
    2. The Tracker panel
      4m 24s
    3. Using the exercise files
      2m 0s
  2. 13m 25s
    1. Warp Stabilizer basics
      5m 59s
    2. Warp Stabilizer advanced parameters
      7m 26s
  3. 30m 6s
    1. Setting up a stabilization
      2m 57s
    2. Track points explained
      5m 48s
    3. Performing a track
      5m 11s
    4. Applying a stabilization
      2m 42s
    5. Cleaning up the results of a stabilization
      3m 0s
    6. Performing a motion track
      5m 57s
    7. Applying the results
      4m 31s
  4. 13m 48s
    1. The Radio Waves effect
      4m 16s
    2. Tracking the mountain
      5m 31s
    3. Compositing the effect
      4m 1s
  5. 24m 28s
    1. Perspective tracking overview
      2m 40s
    2. Tracking to a corner pin
      7m 1s
    3. Improving the composite
      5m 39s
    4. Tracking with mocha-AE
      9m 8s
  6. 31m 49s
    1. Tracking in 3D (new in CS6)
      4m 31s
    2. Creating 3D objects (new in CS6)
      5m 12s
    3. Hanging a poster (new in CS6)
      8m 8s
    4. Adding text (new in CS6)
      5m 33s
    5. Using shadow catchers (new in CS6)
      8m 25s
  7. 16m 46s
    1. Tracking dots
      5m 43s
    2. Dealing with obscuration
      5m 12s
    3. Cleaning up the stabilization
      5m 51s
  8. 12m 40s
    1. Basic keying
      7m 20s
    2. Refining the key
      5m 20s
  9. 13m 32s
    1. Quizzler challenges
      3m 35s
    2. Quizzler #1 solution: Stabilization plus masking
      2m 58s
    3. Quizzler #2 solution: Stabilization plus tracking
      2m 50s
    4. Quizzler #3 solution: Copying a camera's motion
      4m 9s
  10. 12m 28s
    1. Tracking for multiple effect points
      4m 44s
    2. Converting to ray-traced 3D (new in CS6)
      7m 44s
  11. 23m 59s
    1. Legacy tracker advice
      8m 14s
    2. Tracking interlaced sources
      5m 59s
    3. Using garbage masks for keying
      4m 51s
    4. Using the Rolling Shutter Repair feature (new in CS6)
      4m 55s

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