FA-86702 / Procedural level generation constraints / Member archive

Decoration scatter with quadrant quota: Tile lookup transposed · case 02

Props appear inside walls on non-square maps.

Member previewVariant 2 · 3 implementations · 8 checks per implementation

Case contract

Candidates [x, y] (grid[y][x]) are tried in order. Accept when in bounds on '.', its quadrant (x*2//w, y*2//h) holds fewer than per_quadrant accepted props, and its squared Euclidean distance to every accepted prop is at least radius*radius. Returns accepted [x, y].

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 tile lookup #1	`[[2, 0]]`	`[]`	Failed

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