Fluid engine

Colour that moves when you do.

A stable-fluids solver on the GPU. Your pointer pushes velocity and dye into the field; vorticity curls it, a pressure solve keeps it honest, and the dye drifts on the flow it made.

Move the pointer · scroll for the other two presets

02 image-reveal — drag across the plate: the dye is the wipe between two layers

03 text-mask — the same sim, seen only inside the letters

Ink runs through the type and nowhere else.

One script, three presets: hero-dye, image-reveal, text-mask. Both reveal layers are drawn on a canvas at runtime and the mask is rasterized from the live DOM text — no images, no network, works from file://. H toggles the panel.

Under prefers-reduced-motion — or without WebGL — the engine paints a static gradient and never starts a loop.