Lumina Shader - Lite

Visual test candidate replacing the overly subtle RC2 Milky Way.

Changed:

Wider and substantially more visible galactic arc. Irregular luminous clouds and fine-scale structure. Warm, concentrated galactic core. Warped central dust lane inspired by real Milky Way photography. Performance design:

Reuses the existing shader noise texture. Three texture samples only. No iterative procedural-noise loops or volumetric ray marching. Please test at midnight in clear weather and compare visibility near the horizon and zenith.