Atmosphere and Aerial Perspective

Treat sky rendering and aerial perspective as two views of the same scattering model. They must share radii, density profiles, coefficients, sun direction, exposure scale, and coordinate transforms.

This skill contains exemplary examples and assets beyond descriptive guidance, they're worth studying, referencing, or even copying. Use them sufficiently when relevant and do NOT blindly skip them.

Choose the implementation tier

• Small scene with no orbital camera: analytic height/distance approximation.
• Planetary ground-to-space camera: ray integration or precomputed LUTs.
• Large geospatial world: LUTs plus world-to-planet transform, altitude correction, and depth-aware aerial perspective.

Read references/atmosphere-system-contract.md before implementation. It separates the LUT/ellipsoid architecture from dynamic integration and the shell/post handoff.