4dgs

4dgs is an open specification and SDK collection for storing 4D gaussian splat scenes—dynamic 3D geometry with time-varying position, opacity, and existence—along with optional spatial audio sources in a single seekable file. The format supports continuous time modeling, byte-range indexing for efficient streaming, and native multi-source audio with moving 3D poses.

Designed for developers building 3D visualization and spatial audio applications, 4dgs provides SDKs in Python, TypeScript, Rust, C++, and Swift, all validated against a shared conformance suite. The specification is forward-compatible by construction, with bounded error declarations for lossy encodings and renderer-agnostic reconstruction of scene state.