Claude Opus 5 prompt for an explorable Three.js castle world

We are going to build a large, explorable 3D world with Three.js and Vite. At the center, create a massive castle on a hill that the player can walk toward, enter, and explore. Really focus on making the world feel alive and cinematic. Prioritize detailed lighting, volumetric clouds, dense grass, wind simulation, particle effects, god rays, atmospheric fog, and polished camera effects. The castle should feel AAA-quality, with imposing architecture, a functional drawbridge, outer walls, towers, and a large interior courtyard. Make the entire experience feel cohesive, immersive, and visually incredible.

Prompt optimization tips

1

Specify editability

State which objects must remain separate, named and editable; otherwise a visually convincing shell may still be unusable.

2

Close the test loop

Ask the model to run the scene, inspect visible failures and repeat until concrete frame-rate, interaction and layout checks pass.

3

Stage long builds

For large worlds, split the work into districts, assemblies or milestones and approve each section before expanding scope.

Imagine It. Shape It.