chore(task): archive 08-17-native-lane-separator-styles
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{"_example": "Fill with {\"file\": \"<path>\", \"reason\": \"<why>\"}. Put spec/research files only — no code paths. Run `python3 .trellis/scripts/get_context.py --mode packages` to list available specs. Delete this line once real entries are added."}
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# Native Lane Separator Style Overrides Design
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## Contract
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The override is identified by the stable `roadId` plus the adjacent lane pair:
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```json
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{
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"id": "车道分隔线:road:way/123:forward:1-2",
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"kind": "lane-separator-style",
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"roadId": "road:way/123:forward",
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"leftLaneIndex": 1,
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"rightLaneIndex": 2,
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"color": "white",
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"pattern": "dashed"
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}
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```
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The same `yellow|white` and `dashed|solid` enums are reused. A default is
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white dashed. The generated Polygon stores `color`, `pattern` and
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`effective_style`; source IDs remain unchanged.
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## Rendering
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The existing lane separator polygon represents the whole lane-pair path.
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`solid` retains it as one continuous feature. `dashed` samples regular dash
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polygons along the shared centreline with deterministic spacing and preserves
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junction cutback. White uses the existing `lane_separators` material; yellow
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uses a native-only yellow material route. Workbench separates lane separators
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from turn arrows so their styles remain selectable and visible.
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## Compatibility
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No override means current visual default. Road edges, curbs and centre lines
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are untouched. Existing `native-road-overrides/v1` files remain valid.
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{"_example": "Fill with {\"file\": \"<path>\", \"reason\": \"<why>\"}. Put spec/research files only — no code paths. Run `python3 .trellis/scripts/get_context.py --mode packages` to list available specs. Delete this line once real entries are added."}
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# Implementation Plan
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1. Validate and resolve per-lane-pair style overrides.
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2. Generate default/dashed/solid style geometry and effective properties.
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3. Add the native Blender yellow lane-separator material route.
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4. Add Workbench selection, Chinese editor and automatic staging.
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5. Test compiler, Workbench, Blender catalog and Nantaizi native build.
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# Native lane separator style overrides
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## Goal
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Make native same-direction lane separators selectable and persistently editable
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in Road Workbench, using the style override pattern proven for centre lines.
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## Confirmed Facts
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- `compileLaneMarkings()` writes one continuous `0.12m` Polygon separator
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between each adjacent lane pair, identified by `road_id`, `left_lane_index`
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and `right_lane_index`.
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- Lane separators currently have fixed light marking material and are displayed
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together with turn arrows in Workbench.
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- `native-road-overrides.json` already supports validated, persistent centre
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line styles by logical native segment. The new type must not alter road-edge,
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curb or sidewalk geometry.
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## Initial Requirements
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- Selecting a lane separator must show its lane-pair source and a Chinese
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style editor.
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- The first style catalog should mirror centre lines: white/yellow and
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dashed/solid.
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- The effective style must be generated into GeoJSON, visible in Workbench,
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and consumed by native Blender/Cesium.
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- Default output must remain the current white dashed-style separator.
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## Out Of Scope
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- Road-edge lines, curbs, sidewalks, double lines, partial ranges, lane-specific
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legal restrictions and osm2streets layers.
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## Key Decision
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Each override applies only to the selected adjacent lane pair. This preserves
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separate marking semantics on roads with three or more lanes.
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## Acceptance Criteria
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- [ ] Selecting a separator exposes a Chinese style editor for its adjacent
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lane pair; choosing a style stages it automatically.
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- [ ] Save and regeneration preserve the per-pair style across reloads while
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unedited separators retain the default.
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- [ ] GeoJSON, Workbench, Blender and Cesium show the same effective style.
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- [ ] Tests cover validation, defaults, per-pair isolation, automatic staging
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and native scene consumption.
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{
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"id": "native-lane-separator-styles",
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"name": "native-lane-separator-styles",
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"title": "Native lane separator style overrides",
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"description": "",
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"status": "completed",
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"dev_type": null,
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"scope": null,
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"package": null,
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"priority": "P2",
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"creator": "dingkang",
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"assignee": "dingkang",
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"createdAt": "2026-08-17",
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"completedAt": "2026-08-17",
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"branch": null,
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"base_branch": "feature/native-road-compiler",
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"worktree_path": null,
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"commit": null,
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"pr_url": null,
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"subtasks": [],
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"children": [],
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"parent": null,
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"relatedFiles": [],
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"notes": "",
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"meta": {}
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}
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