Blog
Notes from inside the marble race machine
What we’re learning building a video engine that lives in a browser tab - the physics, the formats, and the occasionally unhinged telemetry.
5 Sept 2026 · 8 minWhy the leading marble sings
The design of RaceCut's core mechanic: how a physics race becomes a music video, why rigged races are still real physics, and what a thousand TikTok comment sections taught us.
5 Sept 2026 · 10 minHow RaceCut renders a 60fps music video in your browserNo render farm, no upload: Rust physics compiled to WebAssembly, WebGPU drawing frames, WebCodecs encoding H.264 - and the Safari audio bug that nearly broke us.