Animated masks.
Morph a referenced shape to change the reveal.
Try it in your agent.
Use this prompt as a starting point. Review the result, then ask for the details you want to change.
A prompt to start from
Use Strata. Create an eight-second silent Strata film reveal with the packaged coastal clip. Put “Change / the frame.” in neutral Exposure[-30] at left of a Bone canvas. On the right, reveal the moving film through a narrow organic window that morphs into a wider asymmetric rounded rectangle by 3.5 seconds. Animate the actual commands and cubic handles of the referenced mask shape through the shapePath property. Keep the video fixed and the person legible; do not substitute layer scaling or mask expansion. Retain both editable contour states and the interpolation.
A few useful details.
How do I try this with my agent?
Copy the prompt into your supported local agent with Strata installed. Review the preview, then ask for the changes you want. The composition stays editable as you refine it.
Where does the video render?
Strata previews and renders locally on an Apple Silicon Mac. The local engine is free; your agent’s subscription or usage costs are separate.
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Free local rendering on Apple Silicon Mac. Your agent’s costs are separate.