# SDF Marbles

- **Event:** [Gemini 4 Argon SF Hackathon](https://cerebralvalley.ai/e/gemini-4-argon-sf)
- **When:** Sun, Oct 25 at 9:00 AM – 10:00 PM (PDT)
- **Where:** San Francisco, CA
- **Team:** [Bourke Floyd](https://cerebralvalley.ai/u/chbfiv)
- **GitHub:** https://github.com/bourkefloyd/gemini-4-argon-sfhackathon-2026
- **Demo video:** https://youtu.be/CmwzxOpofZE
- **Gallery:** https://cerebralvalley.ai/e/gemini-4-argon-sf/hackathon/gallery
- **Page:** https://cerebralvalley.ai/e/gemini-4-argon-sf/hackathon/gallery/100

Marble Madness SDF: Lockstep Analytical Jet-SDF Physics, Non-Euclidean Portals 

PLAY IT: 

https://bourkefloyd.github.io/gemini-4-argon-sfhackathon-2026/

Marble Madness SDF is a clean-room remake and expansion of Atari's 1984 classic where the entire 3D world contains zero polygon meshes. A single mathematical Signed Distance Field d(p, t) drives both 60+ FPS WebGL2/WGSL sphere-tracing (with chromatic glass refraction, floor caustics, and non-Euclidean see-through portals) and 120 Hz Symplectic Jet-SDF (jSDF) rolling physics. Players carve craters, extrude mid-air bridges, and freeze surfaces in 0.0018 ms via live CSG mutations across 10 courses (including Riptide Surf, Sahara Dunes, and Neon Obby)

Note video uploading slowly....

## More from Gemini 4 Argon SF Hackathon

- [Patchworld](https://cerebralvalley.ai/e/gemini-4-argon-sf/hackathon/gallery/97)
- [JD](https://cerebralvalley.ai/e/gemini-4-argon-sf/hackathon/gallery/98)
- [Safeexitplanner](https://cerebralvalley.ai/e/gemini-4-argon-sf/hackathon/gallery/99)
- [Spend Theater](https://cerebralvalley.ai/e/gemini-4-argon-sf/hackathon/gallery/101)
- [Tryon](https://cerebralvalley.ai/e/gemini-4-argon-sf/hackathon/gallery/102)
- [FlyMe](https://cerebralvalley.ai/e/gemini-4-argon-sf/hackathon/gallery/103)

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