FA-86538 / Procedural level generation constraints / Member archive

BSP dungeon partition: Odd widths lose a column · case 03

Odd-width partitions leave an unassigned column.

Member previewVariant 3 · 3 implementations · 8 checks per implementation

Case contract

Recursively split the rectangle while depth remains. An axis can be split when that side is >= 2*min_size; if neither can, it is a leaf. Split vertically when w > h, or when w == h at even remaining depth; if the chosen axis cannot be split use the other. The first child gets floor(side/2). Returns leaves [x, y, w, h] in left/top-first order.

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
odd width #1	`[[1, 1, 4, 4], [5, 1, 4, 4]]`	`[[1, 1, 4, 4], [5, 1, 5, 4]]`	Failed

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