A data-driven contour background: contours are computed from application-supplied values (signed focal pressure points, thresholds, active/comparison regions) via canvas marching-squares — not a random topographic texture. Emphasized thresholds get heavier bands, the active region brightens, comparison regions ghost, and data changes ease smoothly. One canvas + one rAF loop (no per-frame React state, no WebGL). Deterministic first paint, intentional light/dark, reduced-motion-static, forced-colors-safe, offscreen-paused.
pnpm dlx shadcn@latest add "https://motiq.dev/r/data-contour-surface.json"