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FA-51056 / Raster clipping / Open access

Triangle strip clip culling: degenerate parity · case 01

Degenerate primitives do not advance strip parity and misorient later visible triangles.

Verified by executionVariant 1 · 12 checks per implementationDownload source bundle ↓JSON ↗

ROOT CAUSE

Degenerate primitives do not advance strip parity and misorient later visible triangles.

THE FAILURE

Degenerate primitives do not advance strip parity and misorient later visible triangles.

Unsuccessful approach: Resetting parity at degenerates loses the assembled-strip position.

Case contract

A vertex is [ID,outside-plane-bits]. Restart is null. Emit oriented triangle-strip primitives only when three distinct IDs exist and the three outside-plane masks have no common active bit. Strip parity advances for every assembled triangle including rejected/degenerate ones; restart clears both vertex history and parity. Only low size plane bits are active.

Why this case matters

Raster clip state can leak coverage across draws even when every individual region is valid.

1 / The failure

Exit 1
"""Failure Map reference implementation. Python standard library only."""
import json

N = 1
observations = []
def solve(commands, size):
    out=[]
    for stream in commands:
        history=[]
        parity=0
        draws=[]
        planes=(1<<size)-1
        for vertex in stream:
            if vertex is None:
                history=[]; parity=0
                continue
            history.append(vertex)
            if len(history)<3: continue
            tri=history[-3:]
            if parity%2: tri=[tri[1],tri[0],tri[2]]
            parity+=1
            if len({v[0] for v in tri})<3: parity-=1; continue
            common=(tri[0][1]&tri[1][1]&tri[2][1]) & planes
            if common: continue
            draws.append([v[0] for v in tri])
        out.append(draws)
    return out
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
if N == 1:
    check('explicit sequence 0', solve([[[0, 0], [1, 0], [2, 0], None, [3, 0], [4, 0], [5, 0]]], 4), [[[0, 1, 2], [3, 4, 5]]])
    check('explicit sequence 1', solve([[[0, 0], [1, 0], [2, 0], [3, 0], [4, 0]]], 4), [[[0, 1, 2], [2, 1, 3], [2, 3, 4]]])
    check('explicit sequence 2', solve([[[0, 0], [1, 0], [1, 0], [2, 0], [3, 0], [4, 0]]], 4), [[[1, 2, 3], [3, 2, 4]]])
    check('explicit sequence 3', solve([[[0, 1], [1, 1], [2, 1], [3, 0], [4, 0]]], 4), [[[2, 1, 3], [2, 3, 4]]])
    check('explicit sequence 4', solve([[[0, 1], [1, 1], [2, 0]]], 4), [[[0, 1, 2]]])
    check('explicit sequence 5', solve([[[0, 512], [1, 512], [2, 512]]], 4), [[[0, 1, 2]]])
    check('explicit sequence 6', solve([[[0, 1], [1, 1], [2, 1]]], 4), [[]])
    check('explicit sequence 7', solve([[[0, 0], [1, 0], [0, 0], [2, 0], [3, 0]]], 4), [[[0, 1, 2], [0, 2, 3]]])
    check('explicit sequence 8', solve([[None, [0, 0], [1, 0]]], 4), [[]])
    check('explicit sequence 9', solve([[[0, 0], [1, 0], [2, 0], [3, 0], [4, 0], None, [5, 0], [6, 0], [7, 0]]], 4), [[[0, 1, 2], [2, 1, 3], [2, 3, 4], [5, 6, 7]]])
    check('explicit sequence 10', solve([[[0, 32], [1, 32], [2, 32]]], 4), [[[0, 1, 2]]])
    check('explicit sequence 11', solve([[[0, 0], [1, 0], [2, 0], [3, 0], None, [4, 0], [5, 0], [6, 0]]], 4), [[[0, 1, 2], [2, 1, 3], [4, 5, 6]]])
if N == 2:
    check('explicit sequence 0', solve([[[0, 0], [1, 0], [2, 0], None, [3, 0], [4, 0], [5, 0]]], 5), [[[0, 1, 2], [3, 4, 5]]])
    check('explicit sequence 1', solve([[[0, 0], [1, 0], [2, 0], [3, 0], [4, 0]]], 5), [[[0, 1, 2], [2, 1, 3], [2, 3, 4]]])
    check('explicit sequence 2', solve([[[0, 0], [1, 0], [1, 0], [2, 0], [3, 0], [4, 0]]], 5), [[[1, 2, 3], [3, 2, 4]]])
    check('explicit sequence 3', solve([[[0, 1], [1, 1], [2, 1], [3, 0], [4, 0]]], 5), [[[2, 1, 3], [2, 3, 4]]])
    check('explicit sequence 4', solve([[[0, 1], [1, 1], [2, 0]]], 5), [[[0, 1, 2]]])
    check('explicit sequence 5', solve([[[0, 512], [1, 512], [2, 512]]], 5), [[[0, 1, 2]]])
    check('explicit sequence 6', solve([[[0, 1], [1, 1], [2, 1]]], 5), [[]])
    check('explicit sequence 7', solve([[[0, 0], [1, 0], [0, 0], [2, 0], [3, 0]]], 5), [[[0, 1, 2], [0, 2, 3]]])
    check('explicit sequence 8', solve([[None, [0, 0], [1, 0]]], 5), [[]])
    check('explicit sequence 9', solve([[[0, 0], [1, 0], [2, 0], [3, 0], [4, 0], None, [5, 0], [6, 0], [7, 0]]], 5), [[[0, 1, 2], [2, 1, 3], [2, 3, 4], [5, 6, 7]]])
    check('explicit sequence 10', solve([[[0, 32], [1, 32], [2, 32]]], 5), [[[0, 1, 2]]])
    check('explicit sequence 11', solve([[[0, 0], [1, 0], [2, 0], [3, 0], None, [4, 0], [5, 0], [6, 0]]], 5), [[[0, 1, 2], [2, 1, 3], [4, 5, 6]]])
if N == 3:
    check('explicit sequence 0', solve([[[0, 0], [1, 0], [2, 0], None, [3, 0], [4, 0], [5, 0]]], 6), [[[0, 1, 2], [3, 4, 5]]])
    check('explicit sequence 1', solve([[[0, 0], [1, 0], [2, 0], [3, 0], [4, 0]]], 6), [[[0, 1, 2], [2, 1, 3], [2, 3, 4]]])
    check('explicit sequence 2', solve([[[0, 0], [1, 0], [1, 0], [2, 0], [3, 0], [4, 0]]], 6), [[[1, 2, 3], [3, 2, 4]]])
    check('explicit sequence 3', solve([[[0, 1], [1, 1], [2, 1], [3, 0], [4, 0]]], 6), [[[2, 1, 3], [2, 3, 4]]])
    check('explicit sequence 4', solve([[[0, 1], [1, 1], [2, 0]]], 6), [[[0, 1, 2]]])
    check('explicit sequence 5', solve([[[0, 512], [1, 512], [2, 512]]], 6), [[[0, 1, 2]]])
    check('explicit sequence 6', solve([[[0, 1], [1, 1], [2, 1]]], 6), [[]])
    check('explicit sequence 7', solve([[[0, 0], [1, 0], [0, 0], [2, 0], [3, 0]]], 6), [[[0, 1, 2], [0, 2, 3]]])
    check('explicit sequence 8', solve([[None, [0, 0], [1, 0]]], 6), [[]])
    check('explicit sequence 9', solve([[[0, 0], [1, 0], [2, 0], [3, 0], [4, 0], None, [5, 0], [6, 0], [7, 0]]], 6), [[[0, 1, 2], [2, 1, 3], [2, 3, 4], [5, 6, 7]]])
    check('explicit sequence 10', solve([[[0, 32], [1, 32], [2, 32]]], 6), [[]])
    check('explicit sequence 11', solve([[[0, 0], [1, 0], [2, 0], [3, 0], None, [4, 0], [5, 0], [6, 0]]], 6), [[[0, 1, 2], [2, 1, 3], [4, 5, 6]]])
if N == 4:
    check('explicit sequence 0', solve([[[0, 0], [1, 0], [2, 0], None, [3, 0], [4, 0], [5, 0]]], 7), [[[0, 1, 2], [3, 4, 5]]])
    check('explicit sequence 1', solve([[[0, 0], [1, 0], [2, 0], [3, 0], [4, 0]]], 7), [[[0, 1, 2], [2, 1, 3], [2, 3, 4]]])
    check('explicit sequence 2', solve([[[0, 0], [1, 0], [1, 0], [2, 0], [3, 0], [4, 0]]], 7), [[[1, 2, 3], [3, 2, 4]]])
    check('explicit sequence 3', solve([[[0, 1], [1, 1], [2, 1], [3, 0], [4, 0]]], 7), [[[2, 1, 3], [2, 3, 4]]])
    check('explicit sequence 4', solve([[[0, 1], [1, 1], [2, 0]]], 7), [[[0, 1, 2]]])
    check('explicit sequence 5', solve([[[0, 512], [1, 512], [2, 512]]], 7), [[[0, 1, 2]]])
    check('explicit sequence 6', solve([[[0, 1], [1, 1], [2, 1]]], 7), [[]])
    check('explicit sequence 7', solve([[[0, 0], [1, 0], [0, 0], [2, 0], [3, 0]]], 7), [[[0, 1, 2], [0, 2, 3]]])
    check('explicit sequence 8', solve([[None, [0, 0], [1, 0]]], 7), [[]])
    check('explicit sequence 9', solve([[[0, 0], [1, 0], [2, 0], [3, 0], [4, 0], None, [5, 0], [6, 0], [7, 0]]], 7), [[[0, 1, 2], [2, 1, 3], [2, 3, 4], [5, 6, 7]]])
    check('explicit sequence 10', solve([[[0, 32], [1, 32], [2, 32]]], 7), [[]])
    check('explicit sequence 11', solve([[[0, 0], [1, 0], [2, 0], [3, 0], None, [4, 0], [5, 0], [6, 0]]], 7), [[[0, 1, 2], [2, 1, 3], [4, 5, 6]]])
if N == 5:
    check('explicit sequence 0', solve([[[0, 0], [1, 0], [2, 0], None, [3, 0], [4, 0], [5, 0]]], 8), [[[0, 1, 2], [3, 4, 5]]])
    check('explicit sequence 1', solve([[[0, 0], [1, 0], [2, 0], [3, 0], [4, 0]]], 8), [[[0, 1, 2], [2, 1, 3], [2, 3, 4]]])
    check('explicit sequence 2', solve([[[0, 0], [1, 0], [1, 0], [2, 0], [3, 0], [4, 0]]], 8), [[[1, 2, 3], [3, 2, 4]]])
    check('explicit sequence 3', solve([[[0, 1], [1, 1], [2, 1], [3, 0], [4, 0]]], 8), [[[2, 1, 3], [2, 3, 4]]])
    check('explicit sequence 4', solve([[[0, 1], [1, 1], [2, 0]]], 8), [[[0, 1, 2]]])
    check('explicit sequence 5', solve([[[0, 512], [1, 512], [2, 512]]], 8), [[[0, 1, 2]]])
    check('explicit sequence 6', solve([[[0, 1], [1, 1], [2, 1]]], 8), [[]])
    check('explicit sequence 7', solve([[[0, 0], [1, 0], [0, 0], [2, 0], [3, 0]]], 8), [[[0, 1, 2], [0, 2, 3]]])
    check('explicit sequence 8', solve([[None, [0, 0], [1, 0]]], 8), [[]])
    check('explicit sequence 9', solve([[[0, 0], [1, 0], [2, 0], [3, 0], [4, 0], None, [5, 0], [6, 0], [7, 0]]], 8), [[[0, 1, 2], [2, 1, 3], [2, 3, 4], [5, 6, 7]]])
    check('explicit sequence 10', solve([[[0, 32], [1, 32], [2, 32]]], 8), [[]])
    check('explicit sequence 11', solve([[[0, 0], [1, 0], [2, 0], [3, 0], None, [4, 0], [5, 0], [6, 0]]], 8), [[[0, 1, 2], [2, 1, 3], [4, 5, 6]]])
print(json.dumps({"observations": observations, "passed": all(x["passed"] for x in observations)}, ensure_ascii=False))
raise SystemExit(0 if all(x["passed"] for x in observations) else 1)
Boundary fixtureActualExpectedOutcome
explicit sequence 0[[[0, 1, 2], [3, 4, 5]]][[[0, 1, 2], [3, 4, 5]]]Passed
explicit sequence 1[[[0, 1, 2], [2, 1, 3], [2, 3, 4]]][[[0, 1, 2], [2, 1, 3], [2, 3, 4]]]Passed
explicit sequence 2[[[1, 2, 3], [3, 2, 4]]][[[1, 2, 3], [3, 2, 4]]]Passed
explicit sequence 3[[[2, 1, 3], [2, 3, 4]]][[[2, 1, 3], [2, 3, 4]]]Passed
explicit sequence 4[[[0, 1, 2]]][[[0, 1, 2]]]Passed
explicit sequence 5[[[0, 1, 2]]][[[0, 1, 2]]]Passed
explicit sequence 6[[]][[]]Passed
explicit sequence 7[[[1, 0, 2], [2, 0, 3]]][[[0, 1, 2], [0, 2, 3]]]Failed
explicit sequence 8[[]][[]]Passed
explicit sequence 9[[[0, 1, 2], [2, 1, 3], [2, 3, 4], [5, 6, 7]]][[[0, 1, 2], [2, 1, 3], [2, 3, 4], [5, 6, 7]]]Passed
explicit sequence 10[[[0, 1, 2]]][[[0, 1, 2]]]Passed
explicit sequence 11[[[0, 1, 2], [2, 1, 3], [4, 5, 6]]][[[0, 1, 2], [2, 1, 3], [4, 5, 6]]]Passed

SHA-256 / 31726c2738f0eb99812b107717c94e9b186adc80f680096cd49539226403cc42

2 / The unsuccessful fix

Exit 1
"""Failure Map reference implementation. Python standard library only."""
import json

N = 1
observations = []
def solve(commands, size):
    out=[]
    for stream in commands:
        history=[]
        parity=0
        draws=[]
        planes=(1<<size)-1
        for vertex in stream:
            if vertex is None:
                history=[]; parity=0
                continue
            history.append(vertex)
            if len(history)<3: continue
            tri=history[-3:]
            if parity%2: tri=[tri[1],tri[0],tri[2]]
            parity+=1
            if len({v[0] for v in tri})<3: parity=0; continue
            common=(tri[0][1]&tri[1][1]&tri[2][1]) & planes
            if common: continue
            draws.append([v[0] for v in tri])
        out.append(draws)
    return out
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
if N == 1:
    check('explicit sequence 0', solve([[[0, 0], [1, 0], [2, 0], None, [3, 0], [4, 0], [5, 0]]], 4), [[[0, 1, 2], [3, 4, 5]]])
    check('explicit sequence 1', solve([[[0, 0], [1, 0], [2, 0], [3, 0], [4, 0]]], 4), [[[0, 1, 2], [2, 1, 3], [2, 3, 4]]])
    check('explicit sequence 2', solve([[[0, 0], [1, 0], [1, 0], [2, 0], [3, 0], [4, 0]]], 4), [[[1, 2, 3], [3, 2, 4]]])
    check('explicit sequence 3', solve([[[0, 1], [1, 1], [2, 1], [3, 0], [4, 0]]], 4), [[[2, 1, 3], [2, 3, 4]]])
    check('explicit sequence 4', solve([[[0, 1], [1, 1], [2, 0]]], 4), [[[0, 1, 2]]])
    check('explicit sequence 5', solve([[[0, 512], [1, 512], [2, 512]]], 4), [[[0, 1, 2]]])
    check('explicit sequence 6', solve([[[0, 1], [1, 1], [2, 1]]], 4), [[]])
    check('explicit sequence 7', solve([[[0, 0], [1, 0], [0, 0], [2, 0], [3, 0]]], 4), [[[0, 1, 2], [0, 2, 3]]])
    check('explicit sequence 8', solve([[None, [0, 0], [1, 0]]], 4), [[]])
    check('explicit sequence 9', solve([[[0, 0], [1, 0], [2, 0], [3, 0], [4, 0], None, [5, 0], [6, 0], [7, 0]]], 4), [[[0, 1, 2], [2, 1, 3], [2, 3, 4], [5, 6, 7]]])
    check('explicit sequence 10', solve([[[0, 32], [1, 32], [2, 32]]], 4), [[[0, 1, 2]]])
    check('explicit sequence 11', solve([[[0, 0], [1, 0], [2, 0], [3, 0], None, [4, 0], [5, 0], [6, 0]]], 4), [[[0, 1, 2], [2, 1, 3], [4, 5, 6]]])
if N == 2:
    check('explicit sequence 0', solve([[[0, 0], [1, 0], [2, 0], None, [3, 0], [4, 0], [5, 0]]], 5), [[[0, 1, 2], [3, 4, 5]]])
    check('explicit sequence 1', solve([[[0, 0], [1, 0], [2, 0], [3, 0], [4, 0]]], 5), [[[0, 1, 2], [2, 1, 3], [2, 3, 4]]])
    check('explicit sequence 2', solve([[[0, 0], [1, 0], [1, 0], [2, 0], [3, 0], [4, 0]]], 5), [[[1, 2, 3], [3, 2, 4]]])
    check('explicit sequence 3', solve([[[0, 1], [1, 1], [2, 1], [3, 0], [4, 0]]], 5), [[[2, 1, 3], [2, 3, 4]]])
    check('explicit sequence 4', solve([[[0, 1], [1, 1], [2, 0]]], 5), [[[0, 1, 2]]])
    check('explicit sequence 5', solve([[[0, 512], [1, 512], [2, 512]]], 5), [[[0, 1, 2]]])
    check('explicit sequence 6', solve([[[0, 1], [1, 1], [2, 1]]], 5), [[]])
    check('explicit sequence 7', solve([[[0, 0], [1, 0], [0, 0], [2, 0], [3, 0]]], 5), [[[0, 1, 2], [0, 2, 3]]])
    check('explicit sequence 8', solve([[None, [0, 0], [1, 0]]], 5), [[]])
    check('explicit sequence 9', solve([[[0, 0], [1, 0], [2, 0], [3, 0], [4, 0], None, [5, 0], [6, 0], [7, 0]]], 5), [[[0, 1, 2], [2, 1, 3], [2, 3, 4], [5, 6, 7]]])
    check('explicit sequence 10', solve([[[0, 32], [1, 32], [2, 32]]], 5), [[[0, 1, 2]]])
    check('explicit sequence 11', solve([[[0, 0], [1, 0], [2, 0], [3, 0], None, [4, 0], [5, 0], [6, 0]]], 5), [[[0, 1, 2], [2, 1, 3], [4, 5, 6]]])
if N == 3:
    check('explicit sequence 0', solve([[[0, 0], [1, 0], [2, 0], None, [3, 0], [4, 0], [5, 0]]], 6), [[[0, 1, 2], [3, 4, 5]]])
    check('explicit sequence 1', solve([[[0, 0], [1, 0], [2, 0], [3, 0], [4, 0]]], 6), [[[0, 1, 2], [2, 1, 3], [2, 3, 4]]])
    check('explicit sequence 2', solve([[[0, 0], [1, 0], [1, 0], [2, 0], [3, 0], [4, 0]]], 6), [[[1, 2, 3], [3, 2, 4]]])
    check('explicit sequence 3', solve([[[0, 1], [1, 1], [2, 1], [3, 0], [4, 0]]], 6), [[[2, 1, 3], [2, 3, 4]]])
    check('explicit sequence 4', solve([[[0, 1], [1, 1], [2, 0]]], 6), [[[0, 1, 2]]])
    check('explicit sequence 5', solve([[[0, 512], [1, 512], [2, 512]]], 6), [[[0, 1, 2]]])
    check('explicit sequence 6', solve([[[0, 1], [1, 1], [2, 1]]], 6), [[]])
    check('explicit sequence 7', solve([[[0, 0], [1, 0], [0, 0], [2, 0], [3, 0]]], 6), [[[0, 1, 2], [0, 2, 3]]])
    check('explicit sequence 8', solve([[None, [0, 0], [1, 0]]], 6), [[]])
    check('explicit sequence 9', solve([[[0, 0], [1, 0], [2, 0], [3, 0], [4, 0], None, [5, 0], [6, 0], [7, 0]]], 6), [[[0, 1, 2], [2, 1, 3], [2, 3, 4], [5, 6, 7]]])
    check('explicit sequence 10', solve([[[0, 32], [1, 32], [2, 32]]], 6), [[]])
    check('explicit sequence 11', solve([[[0, 0], [1, 0], [2, 0], [3, 0], None, [4, 0], [5, 0], [6, 0]]], 6), [[[0, 1, 2], [2, 1, 3], [4, 5, 6]]])
if N == 4:
    check('explicit sequence 0', solve([[[0, 0], [1, 0], [2, 0], None, [3, 0], [4, 0], [5, 0]]], 7), [[[0, 1, 2], [3, 4, 5]]])
    check('explicit sequence 1', solve([[[0, 0], [1, 0], [2, 0], [3, 0], [4, 0]]], 7), [[[0, 1, 2], [2, 1, 3], [2, 3, 4]]])
    check('explicit sequence 2', solve([[[0, 0], [1, 0], [1, 0], [2, 0], [3, 0], [4, 0]]], 7), [[[1, 2, 3], [3, 2, 4]]])
    check('explicit sequence 3', solve([[[0, 1], [1, 1], [2, 1], [3, 0], [4, 0]]], 7), [[[2, 1, 3], [2, 3, 4]]])
    check('explicit sequence 4', solve([[[0, 1], [1, 1], [2, 0]]], 7), [[[0, 1, 2]]])
    check('explicit sequence 5', solve([[[0, 512], [1, 512], [2, 512]]], 7), [[[0, 1, 2]]])
    check('explicit sequence 6', solve([[[0, 1], [1, 1], [2, 1]]], 7), [[]])
    check('explicit sequence 7', solve([[[0, 0], [1, 0], [0, 0], [2, 0], [3, 0]]], 7), [[[0, 1, 2], [0, 2, 3]]])
    check('explicit sequence 8', solve([[None, [0, 0], [1, 0]]], 7), [[]])
    check('explicit sequence 9', solve([[[0, 0], [1, 0], [2, 0], [3, 0], [4, 0], None, [5, 0], [6, 0], [7, 0]]], 7), [[[0, 1, 2], [2, 1, 3], [2, 3, 4], [5, 6, 7]]])
    check('explicit sequence 10', solve([[[0, 32], [1, 32], [2, 32]]], 7), [[]])
    check('explicit sequence 11', solve([[[0, 0], [1, 0], [2, 0], [3, 0], None, [4, 0], [5, 0], [6, 0]]], 7), [[[0, 1, 2], [2, 1, 3], [4, 5, 6]]])
if N == 5:
    check('explicit sequence 0', solve([[[0, 0], [1, 0], [2, 0], None, [3, 0], [4, 0], [5, 0]]], 8), [[[0, 1, 2], [3, 4, 5]]])
    check('explicit sequence 1', solve([[[0, 0], [1, 0], [2, 0], [3, 0], [4, 0]]], 8), [[[0, 1, 2], [2, 1, 3], [2, 3, 4]]])
    check('explicit sequence 2', solve([[[0, 0], [1, 0], [1, 0], [2, 0], [3, 0], [4, 0]]], 8), [[[1, 2, 3], [3, 2, 4]]])
    check('explicit sequence 3', solve([[[0, 1], [1, 1], [2, 1], [3, 0], [4, 0]]], 8), [[[2, 1, 3], [2, 3, 4]]])
    check('explicit sequence 4', solve([[[0, 1], [1, 1], [2, 0]]], 8), [[[0, 1, 2]]])
    check('explicit sequence 5', solve([[[0, 512], [1, 512], [2, 512]]], 8), [[[0, 1, 2]]])
    check('explicit sequence 6', solve([[[0, 1], [1, 1], [2, 1]]], 8), [[]])
    check('explicit sequence 7', solve([[[0, 0], [1, 0], [0, 0], [2, 0], [3, 0]]], 8), [[[0, 1, 2], [0, 2, 3]]])
    check('explicit sequence 8', solve([[None, [0, 0], [1, 0]]], 8), [[]])
    check('explicit sequence 9', solve([[[0, 0], [1, 0], [2, 0], [3, 0], [4, 0], None, [5, 0], [6, 0], [7, 0]]], 8), [[[0, 1, 2], [2, 1, 3], [2, 3, 4], [5, 6, 7]]])
    check('explicit sequence 10', solve([[[0, 32], [1, 32], [2, 32]]], 8), [[]])
    check('explicit sequence 11', solve([[[0, 0], [1, 0], [2, 0], [3, 0], None, [4, 0], [5, 0], [6, 0]]], 8), [[[0, 1, 2], [2, 1, 3], [4, 5, 6]]])
print(json.dumps({"observations": observations, "passed": all(x["passed"] for x in observations)}, ensure_ascii=False))
raise SystemExit(0 if all(x["passed"] for x in observations) else 1)
Boundary fixtureActualExpectedOutcome
explicit sequence 0[[[0, 1, 2], [3, 4, 5]]][[[0, 1, 2], [3, 4, 5]]]Passed
explicit sequence 1[[[0, 1, 2], [2, 1, 3], [2, 3, 4]]][[[0, 1, 2], [2, 1, 3], [2, 3, 4]]]Passed
explicit sequence 2[[[1, 2, 3], [3, 2, 4]]][[[1, 2, 3], [3, 2, 4]]]Passed
explicit sequence 3[[[2, 1, 3], [2, 3, 4]]][[[2, 1, 3], [2, 3, 4]]]Passed
explicit sequence 4[[[0, 1, 2]]][[[0, 1, 2]]]Passed
explicit sequence 5[[[0, 1, 2]]][[[0, 1, 2]]]Passed
explicit sequence 6[[]][[]]Passed
explicit sequence 7[[[1, 0, 2], [2, 0, 3]]][[[0, 1, 2], [0, 2, 3]]]Failed
explicit sequence 8[[]][[]]Passed
explicit sequence 9[[[0, 1, 2], [2, 1, 3], [2, 3, 4], [5, 6, 7]]][[[0, 1, 2], [2, 1, 3], [2, 3, 4], [5, 6, 7]]]Passed
explicit sequence 10[[[0, 1, 2]]][[[0, 1, 2]]]Passed
explicit sequence 11[[[0, 1, 2], [2, 1, 3], [4, 5, 6]]][[[0, 1, 2], [2, 1, 3], [4, 5, 6]]]Passed

SHA-256 / b9cebc20120f90c437dc324413b4e0b4eba3391da61103969d92356031973673

HELD IN THE MEMBER ARCHIVE

The verified repair and its recorded checks are member-only.

This mechanism has 12 recorded checks per implementation. The open-access tier publishes the failure and the unsuccessful fix; the repaired source that passes every check, and the observations that prove it, are available to members.

Every case sharing this mechanism uses the same contract and the same repair, so this one record is held back for all of them.

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Verification & scope

Finite one-dimensional integer sample sets model coverage state only; no geometric intersection, memory layout, GPU or graphics-standard conformance is claimed. This reproducer isolates one failure mechanism. Results cover the supplied fixtures. Variants within a family share a test contract and should remain grouped when constructing evaluation splits. Related mechanisms with a shared evaluation_group must also remain together; these controlled models are not independent production incidents.

Observations recorded using Python 3.12.14 at 2026-09-29T14:45:15.366305+00:00.

Case digest / 1467402970b2db264139c33901ca5c5ad8ec1845538849e1df3604fc1474af50