FA-86834 / Procedural level generation constraints / Member archive

Aligned stair placement: Entrance read as row, column · case 04

Stairs spawn next to the entrance on non-diagonal layouts.

Member previewVariant 4 · 3 implementations · 8 checks per implementation

Case contract

Scan floor_a row by row (y), then column (x); choose the first cell where floor_a[y][x] == '.', the cell exists on floor_b and is '.' there, and the Manhattan distance to entrance [x, y] is at least min_dist. Returns [x, y] or None.

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 entrance axes #1	`[5, 0]`	`null`	Failed

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