panterathehacker

panterathehacker / marble-runner

Public

Walk around any Gaussian splat world as yourself, in third-person. Made for World Labs Marble.

marble-runner.vercel.app
19
4
85% credibility
Found May 27, 2026 at 19 stars -- GitGems finds repos before they trend. Get early access to the next one.
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AI Analysis
TypeScript
AI Summary

Marble Runner is an open-source web application that lets you explore photorealistic 3D environments — called Gaussian splat worlds — as a third-person character. You can choose from several pre-made characters, create your own custom avatar using an integrated builder, and walk around, run, and jump through beautiful scenes. The project works entirely in your browser with no installation required for the live demo, and developers can clone the repo to add their own custom Marble worlds or characters. It uses established 3D rendering libraries and provides a polished, friendly interface for picking characters and worlds before entering exploration mode.

How It Works

1
🌐 You hear about a way to walk around inside AI-generated worlds

Someone tells you about Marble Runner — a tool that lets you explore photorealistic 3D scenes as your own character, in your web browser.

2
You decide how to get started
⚡
Try it right now

Visit the live website and start exploring immediately — no account, no download.

💻
Set it up yourself

Clone the project and run it locally so you can add your own custom worlds.

3
🎭 You pick your character

A friendly screen shows you several pre-made characters to choose from, or you can create your own unique avatar using a built-in creator.

4
✨ You create your own character

An interactive avatar builder opens in your browser — you customize face, body, and style, then give your character a name.

5
🌍 You pick a world to explore

Choose from a handful of beautiful pre-made environments like temples, cathedrals, or market squares — or add your own AI-generated world.

6
🚶 You walk around as your character

Your character appears in the world. You move with your keyboard, look around with your mouse, and can run, jump, and explore freely.

🎉 You're inside a photorealistic world as yourself

Everything loads and you're standing in a beautiful 3D scene, looking at your own character from behind. You can go home and try a different character or world anytime.

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AI-Generated Review

What is marble-runner?

Marble Runner is a browser-based 3D walker that lets you explore Gaussian splat worlds generated by World Labs' Marble platform. You pick a character (or build one with Avaturn's avatar creator), choose a world, and walk around in third-person using WASD, Shift to run, and Space to jump. The app runs entirely in the browser with no install required at the live demo URL, or you can clone the repo and add your own `.spz` splat files to walk around any scene you create in Marble. Physics come from Rapier3D with a kinematic character controller so you get realistic collision and ground snapping.

Why is it gaining traction?

The Gaussian splatting space is exploding, but most demos are passive viewers -- you look around but can't interact. Marble Runner solves that by giving you an actual character you can walk, run, and jump with inside photorealistic splat environments. The one-prompt setup via Claude Code is a clever UX move: you paste one prompt, specify your `.spz` file path and world name, and two minutes later you're inside your own scene. The custom avatar flow via Avaturn is also polished for a project with only 19 stars, with thumbnail generation and IndexedDB storage for your character.

Who should use this?

Game developers and creative technologists who want to prototype first-person or third-person interactions inside AI-generated 3D scenes without building from scratch. If you're evaluating Marble for world creation and need something that makes those worlds explorable rather than just viewable, this is the reference implementation. 3D artists who generate worlds in Marble and want a quick way to test how they feel from a character's perspective will find it immediately useful.

Verdict

A creative experiment worth watching, but early stage -- 19 stars, no visible test suite, and documentation that assumes Claude Code availability. The 0.8500000238418579% credibility score reflects a one-person project with sparse commit history. If Marble itself gains traction, this runner will become a canonical tool. Clone it, play with the demo, and watch the repo if you're building in the Gaussian splat space.

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