Invert Tracking Data?

[Peter O’connell]

Hi, is it a 1 point stabilization or 2 (ie. scale and rotation keyframes as well)?
Pete

roguekeyframe.com

[Simon Bonner]

You should find these tutorials at videocopilot.net useful:

https://www.videocopilot.net/tutorials/demon_face_warp/

https://www.videocopilot.net/tutorials/stabilize_shaky_footage/

(The title of the first one may seem less relevant, but it deals with what you’re describing: stabilising a shot, adding effects etc, then taking away the stabilisation. The second tutorial shows how to stabilise a shot and then add back a little bit of the original shake so it still looks realistic).

Simon Bonner

youtube.com/simonsaysfx

[Collin Alexander]

It’s a 2 point tracking, but not scale and rotation. It’s position and rotation. Scale stays constant.

[Peter O’connell]

Hi, you can precomp everything (set the stabilized plate to ‘Guide Layer’ before precomposing) ,then make a few expressions between the flattened comp with your elements and the stabilized footage’s keyframes. Here is the basic gist of the expressions you need:
comped element’s Position = stabilized plate’s Anchor Point
comped element’s Anchor Point = stabilized plate’s Position
comped element’s Rotation = stabilized plate’s Rotation * -1

If you use these expressions, the comped elements will integrate perfectly with the original plate.
Pete

roguekeyframe.com

[Collin Alexander]

Brilliant, yes AK explains it well. His method worked right off.

Pre Comp. Expand the comp dimensions. Make a new comp. Copy the position data to anchor point, and anchor point data to position. Then copy rotation data to rotation, and multiply the expression by -1.

It works.

Thank you Simon.