Start with the right workspace
Open your preferred coding assistant or 3D tool. Use the model shown on the example as a starting point, and check any linked project for setup instructions.
GPT-6 AstraReference brief
Medieval castle browser animation
A browser-based 3D scene of a medieval castle on a forested hill. The camera continuously rotates around the castle, and a tower flag waves in the wind. The linked author post identifies this as the shared one-shot task used for GPT-6 Astra high and other tested models.
About this example
A starting brief based on the creator's public project, not a verbatim original prompt. Your result will vary.
3D castlemedieval castlebrowser animationforesthillrotating camerawaving flagHTML
The prompt
Create a 3d animation that runs completely in browser. The animation features a medieval castle, sitting on top of a hill that is located on large forest. Do not add any keyboard controls, just make the camera spin around the castle so that we see it from all sides. On top of the castle tower there should be a flag that waves in the wind.
The output should contain index.html file that when executed shows the castle and starts the looping animation.
How to use this prompt
Choose one thing to change
Swap the subject, art style or setting. Keep the camera and interaction clear. Build a small version first, then refine one detail at a time.
Give the scene its own assets
For a custom character or prop, create a 3D model from a short object description or reference image, then bring it into your project.
Previews belong to their respective creators. Check the original source and project license before reusing code or assets.
