Block scenes in the browser, then let an AI direct the camera

What it does CozyClay is a local browser studio for 3D previsualization built on Three.js and React Three Fiber. You block out sets and characters with standard transform gizmos, fly the camera, and scrub a timeline seeded with a pre-generated motion clip so the workspace is usable immediately. Motion generation is optional and only calls out to a remote Kimodo worker when configured.

The interesting bit The studio exposes itself as an MCP server, meaning an assistant like Claude can manipulate the live viewport—placing actors, framing shots in plain language, and sequencing prompt blocks—while you watch the camera update in real time. It turns natural language into blocking notes that actually execute.

Key highlights

• A single history store handles every mutation, with Esc canceling an in-flight drag and restoring the pre-drag transform.
• The Auto Color toggle keeps crowded blockouts readable by assigning stable viewport colors without touching authored materials.
• The MCP layer works headless for project file generation or live against the open editor, and validates all 420 framing combinations in its test suite.
• The full hosted demo stack—queue API, Cloudflare workers, and GPU poller—ships in the repo under AGPL-3.0.

Caveats

• Generating new motion requires an SSH-accessible NVIDIA machine running Kimodo; without that backend, you are limited to the bundled clip and manual posing.

Verdict Filmmakers and AI-video tinkerers who want a lightweight, scriptable blocking environment will find it handy. If you need a self-contained, offline motion-generation pipeline with no external GPU dependency, this is not it yet.