Google demo: Gemini 4 Argon writes a 3D ray tracer in pure Python

Google @GoogleOriginally posted 2026.10.15

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We asked Gemini 4 Argon to make a realistic 3D scene in pure Python with zero external libraries. It wrote 5,000+ lines of code and built its own 3D ray-tracing engine, custom video tool, and audio mixer to render and document this sunlit library from scratch — producing, narrating, and assembling this video with Gemini 3.8 TTS and music by Lyria 3.5.