FA-86584 / Procedural level generation constraints / Member archive

L-shaped corridor carving: Vertical-first corridors stop short · case 04

The corridor never enters the target room.

Member previewVariant 4 · 3 implementations · 8 checks per implementation

Case contract

Carve from centre a [x, y] to b. Horizontal-first walks x from ax to bx on row ay, then y from ay to by on column bx; otherwise y first on column ax, then x on row by. Both legs include their endpoints; returns cells [x, y] in walk order without duplicates.

Why this case matters

Procedural generators silently emit unplayable or unfair levels when a single constraint check uses the wrong boundary, axis, neighborhood or update order; the defect is visible in exact generated geometry.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
fault site final leg endpoint #1	`[[5, 0], [5, 1], [5, 2], [5, 3], [5, 4], [5, 5], [6, 5]]`	`[[5, 0], [5, 1], [5, 2], [5, 3], [5, 4], [5, 5], [6, 5], [7, 5]]`	Failed

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This record includes three runnable implementations, regression fixtures, execution results, and source hashes.

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