orbital_body

Turns a sphere into the planet a derelict is falling around. Self-shading: it owns its own day/night wrap, so the terminator is soft and reddens, the dark side carries city lights instead of going flat black, and the limb gets an atmospheric scattering rim that wraps a little past the terminator.

Continents, ocean shelves, ice caps, a banded cloud deck and the city lights all come out of one noise field evaluated along the fragment's direction from the sphere's centre — no UVs, no textures. The ground and the deck turn at different rates (spin_rate, cloud_speed), so the planet is visibly moving under a wreck that is not.

Tunables: ocean_color / shallow_color / land_low_color / land_high_color / ice_color / cloud_color / atmosphere_color / city_color; continent_scale, land_threshold, ice_latitude; cloud_scale / cloud_coverage / cloud_speed; rim_power / rim_intensity; terminator_width, night_intensity, day_intensity, specular_intensity, spin_rate.