@idle-screens/saver-slipstream

Passthrough wind screensaver for idle-screens: the live page's blocks become obstacles in an analytic potential-flow field — streamlines thread between the content, part around it, and push it as they pass. Seeded, paramSpace, control-track, frame-addressable.

The fourth deep passthrough saver closes the loop the first three opened:

| | coupling | | --- | --- | | black hole | field → blocks (sampled at a point) | | tide | field derivative → blocks (local affine) | | limelight | blocks → blocks (occlusion) | | slipstream | blocks → field → blocks (the page is the boundary condition) |

The wind is classical potential flow: a uniform stream plus one doublet per obstacle (flow past a cylinder), superposed. It is closed-form at every point, divergence-free, and visibly parts around each block. Streamlines are integrated with fixed-step RK2 from seeded starts and cached per quantised flow bucket — a pure function of t — and dust advects along the cached polylines by arc-length offset, so real particle advection costs zero per-frame integration. Blocks hinge at their base like grass and lean with the local deflected wind, not the free stream: a block in a slab's lee feels different air than one in the open.

windAngle is the steered vane and veer is drift around it, so a track that pins veer: 0 hands an agent the compass. Seek renderFrame(t, seed) anywhere; the frame — canvas and page — reproduces exactly.

See the idle-screens repository for full documentation.