FA-86355 / Procedural level generation constraints / Member archive

Room placement with padding: Rooms start on the border row · case 05

Rooms at column or row zero erase the top or left wall.

Member previewVariant 5 · 3 implementations · 8 checks per implementation

Case contract

Candidates [x, y, w, h] are tried in order. A room needs w >= 3 and h >= 3, must stay inside a one-tile border (x >= 1, y >= 1, x+w <= width-1, y+h <= height-1) and must keep at least pad empty tiles to every accepted room on both axes (rooms conflict when their pad-expanded extents overlap). Returns indices of accepted candidates.

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
regression near border #1	`[1, 4, 6]`	`[1, 6]`	Failed

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