This Nuke script will freeze the shapes of a SplineWarp on a desired frame, by deleting keyframes or using an expression. With it you can use splinewarps to stabilize and matchmove elements.
This video will explain how to use the technique
Nukev7 and up
Multithreading can crash Nuke on some cases, disable it if you experience crashes
Select a SplineWarp3 node and fill the freeze frame pop-up with the desired 'Freezeframe'
Limitations: if the animated shape is inside a transformed layer or matrix, you may need to bake the shape points positions with the script: http://www.nukepedia.com/python/misc/rotopainttosplinewarp
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