Soft clouds drifting slowly across a pastel sunset. The sky runs from gold at the horizon through peach and pink to lilac overhead, a low sun glows near the horizon, and the cloud edges facing it catch a warm gold light while their far sides stay in soft lilac shade. A high, thin deck and a fuller, nearer deck drift at different speeds.

A dreamy hero background, and a calm loop behind titles, quotes and social posts. Set the three sky colours, the lit and shaded cloud colours, cloud cover, softness and the sun's glow. The demo has three presets: Golden hour, Cotton candy and Lavender dusk.

What you get: a GLSL ES 3.00 fragment shader for plain WebGL2, an ES module that returns a three.js ShaderMaterial, a Shadertoy version, and a demo page that runs offline with a small settings panel. For video editors there is a 10-second 1920 x 1080 H.264 loop that plays end to start without a seam.

It runs in one pass with no textures needed, at about 2.5 ms of GPU time per frame at 1920 x 1080 on a recent laptop. The README covers set-up in WebGL2, three.js and Shadertoy, every uniform with its default and range, and performance notes.