Thin-film interference iridescence
In your harnessGodot shaderMIT
Iridescent colours of soap bubbles and oil films from a two-beam thin-film interference estimate per colour channel, with film thickness swirled by noise so the colours drift.
What it takes and gives
- Shader type
- spatial
- Render modes
- cull_back, depth_draw_always
- Parameters
- film_index (float = 1.33), thickness_min_nm (float = 250), thickness_max_nm (float = 750), swirl_scale (float = 2), swirl_speed (float = 0.15), opacity (float = 0.35), roughness (float = 0.05), base_color (vec4 = 0.02, 0.02, 0.03, 1)
- Result
- A clear bubble whose reflections shimmer in bands of magenta, green and gold that drift.
- Renderers
- compatibility: compiled and rendered, forward plus: not verified, mobile: not verified
- Placement
- res://baltor/godot_shaders/thin_film_iridescence/
Limits. Two-beam approximation at three wavelengths, not a spectral integration: colours are plausible, not exact. Multiple reflections inside the film are ignored. Transparency uses Godot's alpha blending and is not sorted per pixel.
Details
- Kind
- Godot shader
- Engine
- Godot 4.3 or later
- Files
- 11 files, 79.3 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
- Thin-film interference from the optical path difference 2 n d cos(theta), Per-channel wavelength evaluation, Value noise with quintic interpolation and fractional Brownian motion in 3D
- Tags
- godot shader, spatial, iridescence, thin film, soap bubble, interference, oil slick
- Identity
library.supply.creative_originals.bc0aba1b194e04e7610390b3.84c51e3b379f9ac8- Version
84c51e3b379f9ac85fde94289366641ef65cbbeb95081e21b225f9cf59635ad1
The version is the SHA-256 of the item your harness downloads; every file in it names its own checksum.
Related files
Holographic trading card foilIn your harness
Pearlescent sheen with orient coloursIn your harness
Two-tone car paint with metal flakes and clear coatIn your harness
Something wrong with this item, its rights or its safety? Report it on the support page, or from your harness after a download.