feat: overlay layers above the point cloud and a pointclick event

[giswqs]

Summary

• DeckOverlay.addLayer(id, layer, { overlay: true }) marks a layer to be drawn after every point cloud layer, in the order overlay layers were first added. Point cloud chunks are added as they stream in, so any layer added earlier used to end up underneath them; hosts had to re-append their layers every frame (GeoLibre's measure mirror) to stay on top. This replaces the hard-coded cross-section id rule, and the cross-section tool now uses the flag.
• With pickable on, clicking a point emits a pointclick control event whose point carries the picked point, which now includes its pointCloudId. Hover and click share one picked-point builder.
• README documents both. Requested in [Tracking]: 3D point cloud annotation (classification editing, cuboids, assisted labeling) GeoLibre#2749 ("Supported API for adding overlay layers to the LiDAR canvas", "Click pick event").

Test plan

• tests/overlay-and-click.test.ts: overlay layers stay after chunks added later, keep their place when replaced, and drop back to ordinary ordering without the flag; a click reports the point with its cloud id, class and position, and a miss reports nothing
• Full suite (61 tests) and build

Summary by CodeRabbit

• New Features
  • Point-picking clicks now report the selected point’s cloud ID, index, coordinates, and attributes when picking is enabled.
  • Deck.gl layers can be marked to render above point clouds, including streamed chunks. Set depthCompare: 'always' to keep them visible through points.
• Documentation
  • Added guidance for handling point-click events and adding overlay layers.

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Reviewing files that changed from the base of the PR and between 0dd3333 and 00a09aa.

📒 Files selected for processing (2)

• README.md
• src/lib/core/DeckOverlay.ts

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📝 Walkthrough

Walkthrough

The change adds point-click events with picked-point data and explicit overlay-layer ordering. Cross-section layers use the overlay option. Tests cover click picking and overlay ordering. The README documents both capabilities.

Changes

Lidar interaction updates

Layer / File(s)	Summary
Build and report picked-point data src/lib/layers/types.ts, src/lib/layers/PointCloudManager.ts, tests/overlay-and-click.test.ts	PickedPointInfo can include a point cloud ID. PointCloudManager shares picked-point construction between hover and click handling. It calls the click callback only when a point is picked. Tests check reported point data and invalid indices.
Forward point clicks src/lib/core/types.ts, src/lib/core/LidarControl.ts, README.md	The event types include pointclick and optional picked-point data. LidarControl emits the event with that data. The README documents the event.
Order overlay layers src/lib/core/DeckOverlay.ts, src/lib/tools/CrossSectionTool.ts, tests/overlay-and-click.test.ts, README.md	DeckOverlay.addLayer accepts an overlay option and renders marked layers after unmarked layers while preserving order within each group. Removing or clearing layers also clears their overlay classification. CrossSectionTool marks its layer as an overlay. Tests cover ordering and layer updates. The README documents overlay layers and depthCompare: 'always'.

Priority: ⬇️ Low

Estimated code review effort: 3 (Moderate) | ~20 minutes

Change: Feature

Sequence Diagram(s)

sequenceDiagram
  participant PointCloudLayer
  participant PointCloudManager
  participant LidarControl
  participant EventListener
  PointCloudLayer->>PointCloudManager: Click with picked point
  PointCloudManager->>LidarControl: PickedPointInfo
  LidarControl->>EventListener: pointclick event with point data

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Merge Risk: ⚪ Minimal · up to 00a09

Point clicks provide enriched point data, and marked overlays remain above streamed point-cloud layers. No actionable regression was established, so the change is mergeable.

Security Architecture Review

Security architecture risk: 🔵 Low · up to 0dd33

The changes remain within the existing browser rendering and host-callback boundaries. No introduced security issue was established in the inspected paths, but downstream event uses and rendering failure behavior remain unverified.

Retained concerns
No architecture-level concerns identified.

Security review details

Security Blast Radius

• inferred — The changed paths affect layers and loaded point data associated with a browser map instance, plus host listeners registered on its control. They do not establish new server, tenant, credential or infrastructure authority; external listener behavior remains outside the inspected scope.

Trust Boundaries and Controls

• inferred — Point coordinates and attributes remain dataset-derived values, and pointCloudId identifies the rendering dataset rather than an authorization principal. The new callback carries these values to host code without performing a privileged operation in the inspected path; downstream sinks were not available for assessment.

Resilience and Maintainability Implications

• observed — Normal control removal destroys the rendering overlay, clears event handlers and drops manager references. Re-adding the control constructs a fresh overlay, containing the uncleared classification set on the destroyed instance rather than inheriting it into normal reinitialization.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 1 functions across 7 files. (1 skipped: 1 …	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes both primary changes: overlay layers above the point cloud and the new pointclick event.

Full details: Docstring Coverage

Explanation

Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 1 functions across 7 files. (1 skipped: 1 unsupported.)

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_{A rabbit clicks beside the cloud
A point arrives, its details proud
Overlay layers drift above
Through later chunks, they fit like glove
The rabbit hops and reads the chart
Then burrows home with deck.gl art}

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Actionable comments posted: 1

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• 🪄 Fix CodeRabbit comments on this PR

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Inline comments:
Review comments at @README.md:
- Line 446: Update the README deck.gl layer example to use the v9-supported
depth parameter, replacing depthTest with depthCompare set to always in the
parameters configuration.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Advanced

Run ID: 87d9369f-c928-4e10-8b14-464339738533

📥 Commits

Reviewing files that changed from the base of the PR and between 3812a9f and 0dd3333.

📒 Files selected for processing (8)

• README.md
• src/lib/core/DeckOverlay.ts
• src/lib/core/LidarControl.ts
• src/lib/core/types.ts
• src/lib/layers/PointCloudManager.ts
• src/lib/layers/types.ts
• src/lib/tools/CrossSectionTool.ts
• tests/overlay-and-click.test.ts

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