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  1. Tracking in mocha
  2. Bezier Warp corner pin
  3. Adding depth of field
  4. Rotoscoping
  5. Animated Screen Content


In this tutorial you learn how to replace the content of a tablet PC in After Effects and mocha. Besides the basics of tracking and corner pin, you learn

  • how to do complicated tracks of reflecting surfaces,
  • how to add depth of field to your corner pin
  • how to do rotoscoping quicker with mocha and the Refine Soft Matte effect

Used Footage

The clip used in this tutorial was kindly provided by pond5.
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Nice tips, sir!

But why did we disable the cog wheel for the Reflection layer and not track it whereas we enabled the cog wheel for the Hand layer and tracked it? We want both of them to be excluded but we only tracked one of them. Why?

And also how does mocha track that hand accurately despite the shape we drew includes many surfaces that are not co-planar? Is that a good way of tracking?

Hi Ed,
the reflections where always staying roughly in the same area, hence we didn't bother to track them (the more we track, the slower it gets). But it also wouldn't hurt if you track them.
For an accurate track of the hand, I highly recommend to split it into individual shapes for each planar surface (as I do in chapter 4). But for a rough garbage matte, it is often good enough to use just one mask. If you track an object that consists of many different planes, the track will not be 100% accurate, but mocha will often still figure out the main part of the motion that is consistent with most of the pixels.

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