128x128 cells of 0.75 yd around the camera, recentred in 16-cell steps.
Filled by vertical rays against the collision world (the precip ground
oracle's SpatialQuery + body filter): top surface, then down each hit
until an air gap >= 1.2 yd marks the column covered. Cover is eroded two
cells (drip margin) and 3x3 blurred (soft edge), packed with the top
height into one u32 per cell. 192 casts/frame while filling (nearest
first), 32/frame refresh once full; idle and header off when dry or
rainSurfaces=0.
The grid rides the shared light buffer as a new region right after the
MonkeyFrame block; the prop-probe region (and everything chained from it)
moves up by 65568 B. Uploads only the header and changed rows.
Verified: cargo test -p benilla-world --lib (652 pass, 9 new shelter
tests: column probe, transform, recentre, budget, porch shelter/drip,
packing, region alignment); cargo check -p benilla. Linux only; no
platform seams.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01R8t89gSUuo1uvbXKdh1mJt
Claude
83375f2bae