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Said TurkseverandClaude Opus 5.5
514788303d
The raycast challenge on #768 showed bare-earth casting misplacing roads that are not at grade: lines floated over freeways in trenches and steep streets (rendered line pixels floating: Austin 8.5%, SF 27.1%, LA 43.8%), because a ~111 m terrain grid cannot see a 30 m-wide cut or a slope between its corners. meshSampler.js samples the rendered Google 3D surface (scene.sampleHeight, overlays excluded) once per ~11 m cell within 900 m of the camera, nearest first, in idle time within a 6 ms budget; misses are retried, not latched. groundCast.refineHeights blends it in, per point along a line: - mesh up to 3 m above bare earth is the road: follow it, 1 m above; - higher mesh (canopy, deck, roof): carry the road's offset from bare earth across from the road samples on both sides (up to 8 points); - otherwise bare earth + 2 m, as before. Lines, cones and the marker use it; tiles touched by new samples are redrawn one per idle slice with the no-blink swap. Rendered line pixels on the surface / floating, before -> after: Austin 90.0 -> 95.3% / 8.5 -> 0.7%; SF 69.0 -> 86.4% / 27.1 -> 9.1%; LA 52.3 -> 91.0% / 43.8 -> 4.0%; Innsbruck 95.0 -> 95.7% / 0.2 -> 0.2%; Sacramento 80.7 -> 79.3% / 3.8 -> 2.7%; buried lines stay under 1%. Cones floating in SF 44 -> 5%, buried at LA 59 -> 28%. Main-thread long tasks added during refinement: at most 134 ms (Austin, densest tile). Roads on elevated decks are still drawn at ground level under the deck. Unit tests cover the blend (trench, slope, canopy bridge, deck, bad probe), the finer cast with meshAt, and the sampler (once per cell, nearest first, overlays excluded, far cells skipped, misses not latched, idle when off). Co-Authored-By: Claude Opus 5.5 <[email protected]>