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Compute view cones from proven depths instead of ray-per-corner - #252
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Every ray of a cone leaves the same eye, so the Dart query now works in angles from it. Edges the eye may see are filed once into angular bins, each sorted nearest first, and a ray tests only its own bin. Runs of consecutive ring edges that cross a bin from one boundary to the next prove how far any ray in that bin can travel, and the edge tree is walked nearest node first so whatever starts beyond those depths is skipped whole: nodes, edges and the corners that would have cast rays. The outline is the same shape: over 145,872 cones on all 26 map sides it never differs from the previous native query by more than 1e-5 SVG units. On Lotus and Breeze a cone casts about 2.5x fewer rays and runs 10-20x fewer edge tests. In the browser, dragging a 103° cone, the query's p99 falls from 11-18 ms to 2.5-4.4 ms. svg_cone_exact_test checks every line of real cones against exact single rays, and fails if the hidden-corner test is made even 3% too eager. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Port the Dart query's _ConeBins to the native library. A query now walks the edge tree nearest node first, files each edge it may see into angular bins, proves each bin's depth from runs of ring edges crossing it, and skips nodes, edges and corners that lie provably behind those depths. Each ray then tests only its own bin's edges, nearest first. Outlines are bitwise the same as a literal port of the Dart query, and the cone oracle finds no shape a reference ray disagrees with on all 26 map sides. Rays drop about 2.5x and edge tests about 15x; the oracle's p99 goes from 3.5 ms to 1.6 ms. Ray casting is now about a tenth of the query, so the thread pool and its priority boost are gone and the query runs on the calling thread. Box culling reads the two silhouette corners of a box rather than all four around its centre: the same span for two atan2 calls instead of five. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
A box seen from outside spans the angles between the two corners on its silhouette, and which two depends only on which of the nine regions around the box the eye is in. Two angle calls per node instead of five, as the native query already does. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
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📝 WalkthroughWalkthroughThe Dart and native cone queries now use angular bins to file edges, determine conservative visibility bounds, and cast rays against filed edges. Added tests check cone outlines against exact ray hits, including an optional native run. Documentation describes the algorithm and reports performance results. ChangesCone Query Algorithm
Priority: ➖ Normal Estimated code review effort: 4 (Complex) | ~45 minutes Change: Refactor Sequence Diagram(s)sequenceDiagram
participant Query as Cone query
participant Bins as ConeBins
participant Tree as Spatial edge tree
participant Intersections as Exact edge intersections
Query->>Bins: Initialize bins and aperture
Bins->>Tree: Traverse nodes nearest-first
Tree-->>Bins: Provide candidate edges
Bins->>Bins: File edges and update conservative bin depths
Query->>Bins: Cast sorted query rays
Bins->>Intersections: Test edges filed in each ray's bin
Intersections-->>Query: Return exact ray hits
Merge Risk: 🟡 Moderate · up to The new web cone algorithm can stall or freeze when asked for a very narrow view cone. The native version already guards against this case and the web version does not. Add the same clamp, plus a matching test, before merging. Security Architecture ReviewSecurity architecture risk: 🔵 Low · up to The redesign remains confined to visibility calculations and preserves existing validation and resource ownership. No introduced security attack path was established. Remaining uncertainty concerns rare failure recovery and dependents outside the inspected paths. Retained concerns Security review detailsSecurity Blast Radius
Trust Boundaries and Controls
Resilience and Maintainability Implications
🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 41.94% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 31 functions across 2 files. (3 skipped: 3 unsupported.) ✨ Finishing Touches 💡 1📝 Generate docstrings 💡
🧪 Generate unit tests (beta)
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Review comments at @lib/view_cone/svg_height_visibility.dart:
- Around line 2269-2276: Update `_walkChains` to clamp the computed boundary
start and finish as doubles to [-1, binCount + 1] for non-whole cones before
converting them to integers, then use those bounded values in the loop. Add a
Dart test mirroring the native 1e-300 aperture case to verify the walk
terminates.
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docs/vision-model.mdlib/view_cone/svg_height_visibility.dartnative/height/icarus_svg_height.cppnative/height/svg_height_native_test.cpptest/svg_cone_exact_test.dart
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A cone a millionth of a radian wide has bins so thin that walls beside it are tens of millions of bins away, and at 1e-300 radians past any integer: the chain walk looped over every one and bin lookups overflowed. Clamp the indices while they are doubles, as the native query does, and send NaN (bins with no width at all) to the first. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
On a full circle, -pi and pi are the same direction, but the bins and events treated them as two ends. An edge whose angles began a hair below -pi was never filed in the bins just below pi, so the last ray passed a wall on the seam. A corner on the seam whose angle came out as -pi lost the ray beside it on the pi side, and the outline drew a chord across open sky. File such edges at both ends, wrap rays beside the seam round to the other end, and when proving a corner hidden, check the bin across the seam too. Both queries, Dart and native. svg_cone_exact_test now also probes just either side of every wall corner in range and an even sweep, independent of the outline it checks, and holds open-sky stretches to the range circle's chords, so a wall the query missed entirely, or a false shadow, fails it. Found in review by Astra. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
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At an aperture of 5e-324 radians the bins have no width, and a corner a hair off the cone's direction gave a 0/0 bin index. std::min and std::max pass NaN through, so the native chain walk looped forever where the Dart query, which compares explicitly, returned at once. Compare explicitly in native too. The exactness check also unwraps outline angles in ray order from the cone's first edge: on a full circle the first point's angle could come back as pi rather than -pi, and the check then probed nothing. A test now hands it an outline with a wall left out and expects complaints, including that full circle. Found in review by Astra. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
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The exactness check found its bracketing probes by recomputed angle, which twice let a broken outline through: steps between points wider than half a turn unwrapped backward, and cones narrower than 1e-7 radians had no probes at all. Outline points come in increasing ray order, so angles now unwrap forward only, the last point is pinned to the cone's far edge, and every point must also lie where the ray toward it ends, which needs no bracketing. Test cases for both holes check the check. Found in review by Astra. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
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Re the outside-diff P2 ("Tiny-aperture cone assertions pass without checking ray agreement"): fixed in d9f1bc8. |
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On the web, view cones could take 12–20 ms to compute in some spots, so dragging one dropped frames. This PR changes the algorithm, not just constants. The cone outline is the same shape as before, but most of the rays that used to be cast are now skipped, because they can be proven to land in the middle of a wall the outline already shows.
How it works
A cone's outline is a fan of rays from the eye, joined by straight lines. Before, the query cast rays at every wall corner in range (plus rays just beside each one), each through a map-wide tree. Hot spots cast 5,000–10,000 rays. Most of those corners sit behind nearer walls, so their rays only add points to the middle of a wall the outline already has.
Every ray leaves the same eye, so the query now works in angles from it, the way a 2D renderer does:
The web (Dart) and desktop (
native/height) run the same algorithm. Native now runs on the calling thread; the thread pool, whose stalls caused earlier spikes, is gone.docs/vision-model.mdhas a new section, "How a cone is computed".Same outline
test/svg_cone_exact_test.dartchecks every segment of real cones against exact single rays, on two busy maps plus five tight spots. It fails if the hidden-corner check is made even 3% too eager. WithICARUS_SVG_NATIVE_LIBRARYset, it also checks the native query; I ran it that way locally, since CI doesn't run native-backed Dart tests.Numbers
The web numbers come from a profile web build that drags a cone through the real map widgets in headless Edge. In the full signed-in app (a local build against production with a test account), the same cone drag ran at 99–101 fps, vs 96–100 for #251 and 72–78 for main before #251. All three builds have about 10% of frames over 16 ms. That's CanvasKit re-rasterizing the whole screen every frame, not cones; I'm investigating it separately.
What's left
Testing
flutter test: 1,757 passed, 6 skipped.svg_height_native_test,view_cone_agent_anchor_test,svg_cone_exact_testwithICARUS_SVG_NATIVE_LIBRARY) pass.🤖 Generated with Claude Code
Summary by CodeRabbit
No outstanding findings block merging.
Summary
The PR replaces per-ray tree traversal with angular edge bins and wall-proven depth culling in Dart and native code, removes the native query thread pool, adds exact-ray and tiny-aperture tests, and documents the cone algorithm and performance measurements.
Reviews (3) · Last reviewed commit: "Query natively at the smallest positive ..."