Join Lee Lanier for an in-depth discussion in this video Transform tracking a matte, part of VFX Techniques: Building Replacement with After Effects.
We spent some time separating out the foreground elements so that when we bring…in the new building, they'll set right on top.…There's one more to work on though, and that's this giant building on the left.…Now we can rotoscope that on a separate layer or we can mask it and also use…Motion Tracking to automate that process.…Let's give that a try.…I am going to pull a new copy of street down and place it below Trees and rename…that Foreground and go ahead and then mask out that building. I'll use my Pen…Tool and cut it out and I'm going to do this very quickly, you can spend…more time to make it more accurate.…
The idea is to get all the architectural detail. So mine is a bit rough but this…will give you the idea.…Up to the top, across, down, over, and back to close it. Of course you'll need to…spend a little more time on this, tweak it so it's a nice good fit.…Also you probably want to adjust the feather and maybe the mask expansion on the…mask itself to make sure it has good quality.…I can go ahead and solo this right now.…
Learn how to track the footage with the Adobe After Effects 3D Camera Tracker, replace areas such as the sky, rotoscope moving elements such as buildings and cars, and integrate a digital matte painting so it gains appropriate shifts in perspective and scale. You'll also apply color-grading techniques and learn how to fabricate reflections. The course also covers an alternative motion-tracking workflow with the Foundry CameraTracker plugin.
- Using the After Effects 3D Camera Tracker
- Applying tracking data to 3D layers
- Constructing and refining motion graphics
- Keying out the sky
- Rotoscoping to remove and save features
- Using the Foundry CameraTracker plugin
- Creating reflections
- Color grading