# Glossary

# Generator

Draws one kind of background, such as clouds or an aurora. A layer’s type names its generator, and its parameters tune it. Each generator is a built-in WGSL shader.

# Layer

One generator in a document’s stack, with its parameters, colours, blend mode, opacity and an optional mask.

Aliases: layers

# Palette

A document’s colours, referenced by index from each layer’s colors.

# CSS fallback

CSS gradients that approximate the background, compiled from the same layers. It shows until WebGPU’s first frame, and stays where WebGPU isn’t available.

Aliases: fallback

# Scene

A named group of backgrounds that share one clock and one continuous field, so separate panels read as one.

# OKLCH

A perceptual colour space: lightness, chroma and hue. Aurora’s palettes are written in it.

# OKLab

The perceptual space OKLCH is the polar form of. Aurora blends colours in it.

# ΔE-OK

The distance between two colours in OKLab. Studio’s fidelity score is the mean ΔE-OK between the WebGPU frame and the CSS fallback.

# Display P3

A wider colour gamut than sRGB, shown by most modern screens. Aurora renders in it when it’s available.

Aliases: P3