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fix(street): 0.1.1 collision patch — flush sidewalk edge, graded crossing ramps #21

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zwitschi merged 5 commits from collision-detail-0.1.1 into main 2026-11-08 16:19:11 +01:00
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@@ -13,9 +13,9 @@ Actionable task list for this project. This file is the single, central place fo
Suggested blender skills: **collision-proxy** (UCX/UHX naming, convex hulls, simple collider meshes — the core of the authoring pass), **qa-review** (validation checklists, viewport screenshots, ship/no-ship verdicts for the audit), **asset-optimization** (pre-export validation of every collider). Note: these skills assume MCP-driven Blender; use them as method guides for the headless scripts.
### Patch tasks
### Patch tasks - active - 01a1b26b-3c94-707f-9665-2f6b4a79b564 (branch `collision-detail-0.1.1`)
- [ ] **Sidewalk outer edge against terrain.** The pre-check measured a **15.8 cm** step where a walk sample crosses from `Terrain_DEM` onto `Sidewalk_South` (`Art/blender/README.md`, s≈207 m). Mostly hidden by buildings; visible wherever the frontage is missing. Fix by extending the sidewalk mesh to meet the terrain, or by lowering the outer lip.
- [A] **Sidewalk outer edge against terrain.** The pre-check measured a **15.8 cm** step where a walk sample crosses from `Terrain_DEM` onto `Sidewalk_South` (`Art/blender/README.md`, s≈207 m). Mostly hidden by buildings; visible wherever the frontage is missing. Fix by extending the sidewalk mesh to meet the terrain, or by lowering the outer lip.
- [ ] **Crossing ramp gradient.** The kerb-flush transitions measure **10–13 cm over 1.5 m ≈ 10 %**, steeper than the 8 % a real ramp uses (`Geo/tools/street_section.py` output, s≈33, 39, 126 m). Grade the three ramp openings properly.
- [x] **Collision authoring pass.** Terrain and site meshes use complex-as-simple / `BlockAll` (forced by `UGigLineAssetTools`, verified 2026-11-08 with 84-sample transect). Remaining: simple convex hulls per building (currently using default collision). Record the final settings in `Docs/build.md`.
- [ ] **Kerb height is an assumption.** 0.15 m modelled, 0.13 m as built, and the 3DEP DEM cannot resolve a kerb at all. Check against the photographs and record the final figure.