Sapa

MotionForge turns filmed movement into reusable, interactive JavaScript springs. Frontend and game developers often hand-tune animation parameters. MotionForge offers a measured starting point: upload a short, fixed-camera video, select one moving object, and use Meta SAM 3.1 to track it. A deterministic fitter estimates a supported damped oscillation from the tracked bounding-box centers. Developers can inspect measured-versus-fitted motion, then test the resulting spring on a dot, button, or toast. Dragging and releasing supplies new initial conditions while the source video stays paused. The exported, dependency-free JavaScript contains coefficients and equations, not a recorded position path. **Built for:** Meta Global AI Developer Hackathon 2026 **Track:** Push the Frontier **Prototype validation** - Validated on one physical oscillator clip. - 240/240 frames successfully tracked. - Approximately 1.12% interleaved holdout normalized error. **Limitations** This measures agreement within the observed clip, not future predictive accuracy. Bounding-box centers approximate screen-space motion; true physical mass and stiffness are not recovered. Arbitrary trajectories remain outside the supported motion family.