FA-86708 / Procedural level generation constraints / Member archive

Heightmap smoothing and biome classes: Map edges sink into the sea · case 03

Border cells are averaged as if missing neighbours were zero.

Member previewVariant 3 · 3 implementations · 8 checks per implementation

Case contract

Each cell height becomes floor(mean) of the in-bounds cells in its 3x3 window (input values only). Class: '~' when v < sea, 's' beach when v < sea+2, 'g' when v < mountain, otherwise '^'. Returns strings per row.

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
single row #1	`["~~~"]`	`["^s^"]`	Failed

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