Smudge metal

Move across a surface and the cursor wipes it clean. A half-resolution buffer keeps the path you drew, erodes it with curl noise and grain, and hands the result to a lighting pass that relights a hidden layer through a normal map. Hold the button to stop the erosion and draw. Four presets: liquid-metal, frost, ink, heat.

01 the surface — drag across it; the panel drives this one

Move to smudge · hold to draw

02 looks — same engine, four material setups

Frostreveal through a frosted pane

Inkslow, wet, long-lived

Heatemissive, cools fast

03 revealed content — the hidden layer is a headline, not a texture

Wipe the plate to read it

Every layer — base plate, revealed plate and normal map — is painted on a canvas at runtime from a seeded noise field. No images, no network, works from file://. H toggles the panel.

Under prefers-reduced-motion — or without WebGL2 — each surface paints a single still frame and never starts a loop.