Bridge elevation (bridge.md M1+M2): tools/map_tiles bridge-bake solves
per-vertex road/rail dz over the OSM graph (crossing clearance, grade
ramps, deck holds, junction consensus) with AHN DSM-DTM measured deck
profiles (BigTIFF reader in geodata, WGS84->RD), baked as bridge_dz +
per-base-tile base_dz (L/F/P join to exact renderer geometry). Renderer
joins dz through parse into TileWay.dz; strokes/arrows/fills lift off
their own profiles; tunnels never deck.
Road overlay unifier: painter's algorithm as geometry — per-way segment
rects + vertex discs, i_overlay top-down subtraction cascade into
DISJOINT faces (overlay_paint_groups), triangulated once; flat render is
pixel-equal to paint order (proven 0-diff on the abstract unit case) and
tilt cannot reorder it. Legacy strokes interleave by rank; plazas join
the cascade at true alpha. @roads 0/1 A/B toggle, @abtest headless
CPU-raster diff harness (1.50% vs 2D reference on the Raampoort tile),
@cam debug camera, bridge_eval.sh aerial-vs-render loop.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
