FA-86460 / Procedural level generation constraints / Member archive

Platform jump reachability: Drops are limited by jump height · case 05

Players cannot drop down to lower platforms.

Member previewVariant 5 · 3 implementations · 8 checks per implementation

Case contract

platforms [x1, x2, y] (y grows upward); the player starts on platform 0. From A the player reaches B when rise = yB-yA <= jump_h (any drop is allowed) and the horizontal gap max(0, xB1-xA2, xA1-xB2) <= jump_d - max(0, rise)//2. Reachability is transitive. Returns sorted reachable indices.

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
deep drop #1	`[0]`	`[0, 1]`	Failed

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This record includes three runnable implementations, regression fixtures, execution results, and source hashes.

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