FA-87557 / Collision detection broadphase / Member archive

Ended pairs are computed from the symmetric difference · case 02

New contacts are reported as ending on their first frame.

Member previewVariant 2 · 3 implementations · 8 checks per implementation

Case contract

solve(prev, curr, asleep): contact pair cache update. Pairs are unordered; self pairs in curr are ignored. Previous pairs whose two bodies are both asleep persist even if not re-reported. Return [begin, end, persist] as sorted [min,max] lists.

Why this case matters

Broadphase stages decide which object pairs ever reach narrowphase; a wrong boundary, ordering or bookkeeping rule silently drops real contacts or floods the solver with false candidates.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
case 0	`[[[1, 3], [1, 7], [2, 6], [4, 7]], [[1, 3], [1, 7], [2, 3], [2, 6], [4, 7]], [[1, 2]]]`	`[[[1, 3], [1, 7], [2, 6], [4, 7]], [[2, 3]], [[1, 2]]]`	Failed

MEMBER ARCHIVE

The complete case is available to members.

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

Member access is invitation-based. Sign in with your invited account to inspect the sources.