Cipher lock

A padlock guards a field of data blocks: while it stands open a scan wave checks every block, trusted ones cool to ice, hostile ones flare hot and sink into quarantine, and then the lock drops shut and freezes.

One GLSL fragment shader in raw WebGL2 that raymarches signed distance fields
Padlock built from a bevelled box, an engraved keyhole and a capped-torus shackle, all animated by easing curves inside the shader
Domain-repeated data blocks with hashed bobbing and a cell-bounded step that keeps the march artefact-free
Penumbra soft shadows, 5-tap ambient occlusion, fresnel rims and a marched floor reflection
Adaptive render scale from 0.5 to 1.0, upscaled in a filmic post pass

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