🏁 Weld the Skyweave forks, seat the structures, and land the finish

[sasler]

Four reported defects in the Claude Opus 5 Neon Horizon Racer, plus a few found alongside them.

1. The forks read as tears and pointed the wrong way

index.html:242 hardcoded "steer left to commit" and the commit test hardcoded r.lateral < -1.6, but both branches diverge to +side — screen right — which the file's own sideOfMain() already computed as +1. So the player was told to steer away from the fork and could only commit by hugging the wrong rail.

The side is now resolved from the geometry once, in buildCircuit, and read by the prompt, the commit test, the signposts and the takeBranch hook. A new junctionReport() hook projects a point inside each branch through the live chase camera, so a test can assert the wording against where the branch is actually drawn.

The junction geometry is rebuilt:

• weldJunction blends each branch's derived bank and width into the main line's across the gore, unwrapping through the corkscrews' turn count. Bank was previously derived from each line's own curvature with its own smoothing window, so the two decks met a few degrees rolled apart — the visible tearing wedge. Residual roll at the seams is now < 1e-6.
• The ring walk starts and ends on the junction samples. It used to stride from index 0, leaving up to a ring of raced deck undrawn exactly where the branch meets the road.
• Rails ramp instead of switching. The main line's rail opens across the junction so there is no wall to cross; the branch's shared rail grows back out of the gore as the roads separate. Previously the clipped rail was flattened to a black strip lying on the road while the main line kept its full-height rail straight through the middle of the split.
• The shared edge overlaps 35 cm so no hairline seam can open.
• The gore is painted with amber hazard chevrons via a widened aTrack.w, weighted outboard so the racing line stays clean.

2. Structures floated

• CanopyTruss was a 50 m gantry whose legs stopped 9 m below the deck plane and 13 m outboard of it — it never touched anything — and TRUSS_AT dropped several inside junction spans, where from a branch you see a detached gantry hanging in the void.
• BranchPylon hovered 3.4 m past the deck edge over nothing, mirrored to both sides so its chevrons pointed both ways.
• GateArch used fixed 0.86 / 0.68 scales, putting a 29 m span's footings ~3 m past the deck edge.
• Main-line RibbonAnchor slots had no junction exclusion, though branch slots did.

Both offending assets are re-authored in Blender to clamp the ribbon — deck-edge legs plus an under-deck yoke on the truss, a bolted deck plate and under-hook on the pylon. Every deck-mounted prop is now seated by scaling its authored deck-edge reference onto the local half-width, and placement is junction-aware throughout. A propReport() hook reports worst-case footing overhang per family so this cannot regress silently.

3. The start line was invisible

There was no start structure at all: checkpoint gate 0 sat at s = 40 and looked identical to the other eight, while the actual lap boundary was an unmarked wrap at s = 0. A new StartGantry root — half again as tall as a checkpoint, twin lattice columns over a lit portal, timing pods, and a 12×3 chequered banner board — now stands on the boundary itself, over a procedural chequer band with amber lips that flashes on every crossing. The nine checkpoints are re-spaced half a slot in so none crowds it.

4. Finishing was silent

finishRacer fired one arpeggio and one particle burst; the else at the lap accounting swallowed any on-screen message; and endRace() only ran once every racer had finished, so a winning player coasted to a stop under an unchanged HUD for as long as the slowest rival took. Steering also stayed live after finishing.

Crossing now lands a chequer-topped #finishBanner with the placement and a live "waiting on" line, a screen flash, a multi-wave burst, a fuller audio cadence and a hero-orbit camera. The board arrives when the field is in or after a five-second outro hold, whichever comes first, quoting a metre gap for any rival still out instead of the DNF that live play could never reach. Steering is gated once finished, and the final lap is called out on the HUD.

Found alongside

• Bollard cluster members now re-check gate proximity for themselves; the s + k * 9 offset could walk one into a gate mouth.
• Main-line anchors skip junctions, as branch anchors already did.
• Props with no deck reference no longer scale to NaN — this had made the fork signposts invisible until a visual check caught it.
• The seed-determinism probe held a steer key, which pinned the craft against a rail where the run saturates and stopped sampling the seeded hazard scatter it exists to probe. Same assertions, throttle only.

Assets

Blender 5.2.0 LTS via Blender Assets MCP: StartGantry added, CanopyTruss and BranchPylon re-authored, skyweave-structures.glb re-exported (485 KiB → 1.17 MiB, cap 6 MiB), manifest recipe updated. Bevels reduced to one segment on the new large parts so the deck-clamped truss costs about what the floating one did.

Verification

Command	Result
npm run validate:game-assets	2 manifests, 4 files
npm run test:game-assets	13 pass
npm run lint	clean
npx playwright test tests/outrun-racer-opus-5.spec.ts	23 pass (6 new)
npx playwright test tests/games-load.spec.ts --grep outrun-racer	3 pass
npm run build	clean
npm run inspect:threejs -- --game outrun-racer --model opus-5 --state active-play	110 calls / 290,304 triangles, down from 315,792 before this change

npm run sync:three-runtime -- --check reports the vendored runtime out of sync on this Windows checkout; the files are byte-identical to node_modules/three@0.185.1 apart from CRLF line endings, and public/vendor is untouched by this branch.

Visual review at 1280×720 through the sandboxed play page covered all four defects: both fork approaches (prompt direction, welded seam, hazard-striped gore), inside a branch mid-junction (nothing hanging beside the other deck), the start gantry and chequer band from the grid, and the crossing in place plus the results board.

🤖 Generated with Claude Code

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[Copilot]

Pull request overview

Fixes multiple gameplay, geometry, prop-placement, and finish-flow defects in the Claude Opus 5 “Neon Horizon Racer / Skyweave” Three.js game, and adds regression hooks/tests to prevent the fork/junction/structure/finish issues from reappearing.

Changes:

• Rebuilds junction handling (fork side resolution, welded seams, rail openings/ramps, hazard chevrons) and updates fork prompt + commit logic to match geometry.
• Reworks prop placement to be junction-aware, adds StartGantry + start-line band/flash, and improves finish flow (banner, outro hold, steering gating, hero camera).
• Expands Playwright coverage with new tests for fork prompts/commit direction, junction seam integrity, prop seating, and start/finish behavior.

Reviewed changes

Copilot reviewed 4 out of 5 changed files in this pull request and generated 1 comment.

File	Description
tests/outrun-racer-opus-5.spec.ts	Adds regression tests for fork prompt correctness, fork commitment, junction welding, prop seating, and start/finish flow.
public/games/outrun-racer/opus-5/index.html	Implements the core fixes: junction welding/rails, prop seating & reporting hooks, start-line structure/band/flash, and improved finish/outro behavior.
public/games/outrun-racer/opus-5/assets/manifest.json	Updates the authored-asset recipe/prompt and purpose to include StartGantry and new seating assumptions.
games-metadata.json	Updates LOC and asset byte counts for the opus-5 version metadata.

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