Planet atmosphere shell with analytic path length
In your harnessGodot shaderMIT
Atmosphere glow for planets: on a shell sphere around the planet, the length of each view ray through the atmosphere is computed analytically, turned into scattering with an exponential, and lit only on the sun side.
What it takes and gives
- Shader type
- spatial
- Render modes
- blend_add, cull_back, depth_draw_never, shadows_disabled
- Parameters
- atmosphere_color (vec4 = 0.35, 0.6, 1, 1), sunset_color (vec4 = 1, 0.5, 0.3, 1), shell_radius (float = 1), planet_radius (float = 0.9), density (float = 1.2), brightness (float = 1.6), terminator_softness (float = 0.35), night_glow (float = 0.02)
- Use it on
- A planet mesh and a slightly larger sphere for the shell, both centred at the same point; a DirectionalLight3D as the sun.
- Result
- A planet with a thin blue halo on its sunlit limb that turns orange at the terminator.
- Renderers
- compatibility: compiled and rendered, forward plus: not verified, mobile: not verified
- Placement
- res://baltor/godot_shaders/planet_atmosphere_rim/
Limits. Single-colour scattering with an exponential falloff, not Rayleigh and Mie integration. The shell must be a sphere centred on its origin without non-uniform scale. Additive, so it cannot darken the planet. The camera must stay outside the shell.
Details
- Kind
- Godot shader
- Engine
- Godot 4.3 or later
- Files
- 11 files, 59.2 KB
- Licence
- MIT
- Declared effects
- reads files, runs commands
- Checked with
- Godot 4.7.2, opengl3 compatibility (Mesa llvmpipe, Xvfb)
- Checks
- contract static, engine run, engine log clean, shader in scene, capture written, render not uniform, shader changes pixels
- Techniques
- Analytic ray-sphere chord length (closest approach distance), Exponential scattering from optical depth, Fragment-to-light varying for light-dependent glow
- Tags
- godot shader, spatial, atmosphere, planet, space, rim, custom light function
- Identity
library.supply.creative_originals.ea6340f0d400ddcd0ab0d36c.53484e98270e773e- Version
53484e98270e773e16213dcb77831025c3c7bd546cfc2a66c0c1b5b6174b4850
The version is the SHA-256 of the item your harness downloads; every file in it names its own checksum.
Related files
Procedural planet surface with oceans, biomes and ice capsIn your harness
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