FA-86500 / Procedural level generation constraints / Member archive

Strip wave-function propagation: One-sided support keeps tiles · case 05

Tiles unsupported on one side survive propagation.

Member previewVariant 5 · 3 implementations · 8 checks per implementation

Case contract

A 1D strip of cells, each with a domain of tiles; rules[t] lists tiles allowed immediately to the right of t. Repeatedly remove tile t from cell i unless (i is first or some tile l in cell i-1 allows t on its right) and (i is last or t allows some tile in cell i+1), until stable. Domains are returned as sorted unique lists with a contradiction flag (any empty domain).

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
coast gradient #1	`{"contradiction": false, "domains": [["sea"], ["grass", "sand", "sea"], ["hill"]]}`	`{"contradiction": true, "domains": [[], [], []]}`	Failed

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