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How to Build 3D Worlds with Astra

A developer using GPT-6 Astra has created photorealistic 3D worlds, including a Manhattan replica in Unreal Engine and a browser-native neighborhood with a zombie survival game, accumulating over 15 million views on X. The creator shares a five-step method—Reference, Assets, Assembly, Critique, Ship—in a subscriber guide, emphasizing that no single prompt achieves these results.

read1 min views1 publishedSep 7, 2026
How to Build 3D Worlds with Astra
Image: Somethingbig (auto-discovered)

Over the last few weeks, I’ve had GPT-6 Astra build a photorealistic 3D Manhattan in Unreal Engine, a 1:1 browser-native replica of the neighborhood I grew up in (complete with a playable zombie survival game), a simulated civilization populated by autonomous agents, among many other experimental builds. Collectively, these experiments have pulled over 15 million views on X.

The reaction is almost always the same: “What’s the prompt?” “There’s no way that’s one shot.” “How did you get it to look like that?”

Unfortunately, there is no silver-bullet prompt... however, the loop is the same every time:

Reference→Assets→Assembly→Critique→Ship.

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