After developing and testing this tool for some time, it is ready for public release: the Nuke .fxs (Silhouette shape format) exporter.
This Nuke Python script lets you export shapes from any Roto or RotoPaint node to Silhouette Roto and Paint.
(Yes: Mocha shapes can now go into Silhouette when you need them.)
SUPPORTED FEATURES
Shape position/animation (baked) Shape Opacity Animation Shape Motion Blur Shape Overlay Color Shape Blending Modes Shape Inverted attribute Shape Open/Closed Delete repeated baked keyframes when possible
Nukepedia is not accepting new entries yet, so I'll post the script here for now .
I am working on an improved version without the need to bake all the keyframes. Please get in touch with feedback, bug reports, and requests!