FA-86587 / Procedural level generation constraints / Member archive

L-shaped corridor carving: Vertical leg on the source column · case 02

Horizontal-first corridors leave the corner disconnected.

Member previewVariant 2 · 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
leftward corridor #1	`[[5, 1], [4, 1], [3, 1], [2, 1], [5, 2], [5, 3]]`	`[[5, 1], [4, 1], [3, 1], [2, 1], [2, 2], [2, 3]]`	Failed

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

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