Luminance track mattes.
Use the brightness of another layer to control visibility.
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 composition. On a Bone canvas, use the Exposure[-30] title “Let light / lead.” at left. Reveal a moving coastal film at right through a fully opaque black-to-white horizontal gradient using a Luma track matte: the dark side disappears into the canvas while the bright side preserves the person and sea. Keep the matte source separate and editable. Use continuous footage as the motion; the mask should have a stable, soft spatial reveal.
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.