Building a browser game inside a Gaussian splat made in World Labs Marble

theworldlabs · x · 2026-09-16

Developer isaacmason released a browser game demo running inside a Gaussian splat scene built in World Labs Marble, using three.js + spark + crashcat + navcat, with a full walkthrough video on the World Labs YouTube channel and open-source code.

The tutorial covers the full stack of building blocks: rendering splats with level of detail, generating collision and navigation meshes from splats, a first-person character controller, baking light probes for environment lighting on characters, and character shadows inside the splat scene — inspired by SimonDev's three.js game tutorials.

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