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FA-51016 / Raster clipping / Open access

Homogeneous segment clip: entering endpoint · case 01

An entering intersection replaces the inside endpoint and retains the outside endpoint.

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

ROOT CAUSE

An entering intersection replaces the inside endpoint and retains the outside endpoint.

THE FAILURE

An entering intersection replaces the inside endpoint and retains the outside endpoint.

Unsuccessful approach: Replacing both endpoints discards the visible remainder of an entering segment.

Case contract

Clip ordered segments in homogeneous (x,w,u) coordinates against requested left x+w>=0, right w-x>=0 and eye w>=1 halfspaces. Interpolate every component at intersections before perspective division; retain endpoint order. Output exact rational strings, or null for rejected segments. The integer surface size scales horizontal halfspaces.

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):
    from fractions import Fraction
    out=[]
    for first,last,planes in commands:
        a=list(map(Fraction,first)); b=list(map(Fraction,last))
        original_a=list(a); original_b=list(b)
        rejected=False
        for plane in planes:
            def distance(p):
                if plane=='left': return p[0]+size*p[1]
                if plane=='right': return size*p[1]-p[0]
                return p[1]-1
            da=distance(a); db=distance(b)
            ia=da>=0; ib=db>=0
            if not ia and not ib: rejected=True; break
            if ia and ib: continue
            t=da/(da-db)
            point=[a[i]+t*(b[i]-a[i]) for i in range(3)]
            if not ia: b=point
            else: b=point
        out.append(None if rejected else [[str(v) for v in a],[str(v) for v in b]])
    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([[[-12, 1, 0], [0, 1, 12], ['left']]], 4), [[['-4', '1', '8'], ['0', '1', '12']]])
    check('explicit sequence 1', solve([[[0, 1, 0], [12, 1, 12], ['right']]], 4), [[['0', '1', '0'], ['4', '1', '4']]])
    check('explicit sequence 2', solve([[[-20, 1, 0], [-15, 1, 5], ['left']]], 4), [None])
    check('explicit sequence 3', solve([[[-4, 1, 0], [-8, 2, 8], ['left']]], 4), [[['-4', '1', '0'], ['-8', '2', '8']]])
    check('explicit sequence 4', solve([[[0, 0, 0], [0, 2, 10], ['eye']]], 4), [[['0', '1', '5'], ['0', '2', '10']]])
    check('explicit sequence 5', solve([[[-12, 1, 0], [12, 1, 24], ['left', 'right']]], 4), [[['-4', '1', '8'], ['4', '1', '16']]])
    check('explicit sequence 6', solve([[[0, 1, 0], [12, 1, 12], ['left', 'right']]], 4), [[['0', '1', '0'], ['4', '1', '4']]])
    check('explicit sequence 7', solve([[[0, 1, 0], [1, 1, 1], ['eye', 'left', 'right']]], 4), [[['0', '1', '0'], ['1', '1', '1']]])
    check('explicit sequence 8', solve([[[-12, 0, 0], [12, 2, 24], ['left', 'right', 'eye']]], 4), [[['0', '1', '12'], ['6', '3/2', '18']]])
    check('explicit sequence 9', solve([[[-15, 1, 0], [-20, 1, 5], ['left']]], 4), [None])
    check('explicit sequence 10', solve([[[0, 0, 0], [0, 1, 1], ['eye']]], 4), [[['0', '1', '1'], ['0', '1', '1']]])
    check('explicit sequence 11', solve([[[-40, 0, 0], [40, 2, 24], ['right', 'eye']]], 4), [[['0', '1', '12'], ['40/9', '10/9', '40/3']]])
if N == 2:
    check('explicit sequence 0', solve([[[-12, 1, 0], [0, 1, 12], ['left']]], 5), [[['-5', '1', '7'], ['0', '1', '12']]])
    check('explicit sequence 1', solve([[[0, 1, 0], [12, 1, 12], ['right']]], 5), [[['0', '1', '0'], ['5', '1', '5']]])
    check('explicit sequence 2', solve([[[-20, 1, 0], [-15, 1, 5], ['left']]], 5), [None])
    check('explicit sequence 3', solve([[[-4, 1, 0], [-8, 2, 8], ['left']]], 5), [[['-4', '1', '0'], ['-8', '2', '8']]])
    check('explicit sequence 4', solve([[[0, 0, 0], [0, 2, 10], ['eye']]], 5), [[['0', '1', '5'], ['0', '2', '10']]])
    check('explicit sequence 5', solve([[[-12, 1, 0], [12, 1, 24], ['left', 'right']]], 5), [[['-5', '1', '7'], ['5', '1', '17']]])
    check('explicit sequence 6', solve([[[0, 1, 0], [12, 1, 12], ['left', 'right']]], 5), [[['0', '1', '0'], ['5', '1', '5']]])
    check('explicit sequence 7', solve([[[0, 1, 0], [1, 1, 1], ['eye', 'left', 'right']]], 5), [[['0', '1', '0'], ['1', '1', '1']]])
    check('explicit sequence 8', solve([[[-12, 0, 0], [12, 2, 24], ['left', 'right', 'eye']]], 5), [[['0', '1', '12'], ['60/7', '12/7', '144/7']]])
    check('explicit sequence 9', solve([[[-15, 1, 0], [-20, 1, 5], ['left']]], 5), [None])
    check('explicit sequence 10', solve([[[0, 0, 0], [0, 1, 1], ['eye']]], 5), [[['0', '1', '1'], ['0', '1', '1']]])
    check('explicit sequence 11', solve([[[-40, 0, 0], [40, 2, 24], ['right', 'eye']]], 5), [[['0', '1', '12'], ['40/7', '8/7', '96/7']]])
if N == 3:
    check('explicit sequence 0', solve([[[-12, 1, 0], [0, 1, 12], ['left']]], 6), [[['-6', '1', '6'], ['0', '1', '12']]])
    check('explicit sequence 1', solve([[[0, 1, 0], [12, 1, 12], ['right']]], 6), [[['0', '1', '0'], ['6', '1', '6']]])
    check('explicit sequence 2', solve([[[-20, 1, 0], [-15, 1, 5], ['left']]], 6), [None])
    check('explicit sequence 3', solve([[[-4, 1, 0], [-8, 2, 8], ['left']]], 6), [[['-4', '1', '0'], ['-8', '2', '8']]])
    check('explicit sequence 4', solve([[[0, 0, 0], [0, 2, 10], ['eye']]], 6), [[['0', '1', '5'], ['0', '2', '10']]])
    check('explicit sequence 5', solve([[[-12, 1, 0], [12, 1, 24], ['left', 'right']]], 6), [[['-6', '1', '6'], ['6', '1', '18']]])
    check('explicit sequence 6', solve([[[0, 1, 0], [12, 1, 12], ['left', 'right']]], 6), [[['0', '1', '0'], ['6', '1', '6']]])
    check('explicit sequence 7', solve([[[0, 1, 0], [1, 1, 1], ['eye', 'left', 'right']]], 6), [[['0', '1', '0'], ['1', '1', '1']]])
    check('explicit sequence 8', solve([[[-12, 0, 0], [12, 2, 24], ['left', 'right', 'eye']]], 6), [[['0', '1', '12'], ['12', '2', '24']]])
    check('explicit sequence 9', solve([[[-15, 1, 0], [-20, 1, 5], ['left']]], 6), [None])
    check('explicit sequence 10', solve([[[0, 0, 0], [0, 1, 1], ['eye']]], 6), [[['0', '1', '1'], ['0', '1', '1']]])
    check('explicit sequence 11', solve([[[-40, 0, 0], [40, 2, 24], ['right', 'eye']]], 6), [[['0', '1', '12'], ['120/17', '20/17', '240/17']]])
if N == 4:
    check('explicit sequence 0', solve([[[-12, 1, 0], [0, 1, 12], ['left']]], 7), [[['-7', '1', '5'], ['0', '1', '12']]])
    check('explicit sequence 1', solve([[[0, 1, 0], [12, 1, 12], ['right']]], 7), [[['0', '1', '0'], ['7', '1', '7']]])
    check('explicit sequence 2', solve([[[-20, 1, 0], [-15, 1, 5], ['left']]], 7), [None])
    check('explicit sequence 3', solve([[[-4, 1, 0], [-8, 2, 8], ['left']]], 7), [[['-4', '1', '0'], ['-8', '2', '8']]])
    check('explicit sequence 4', solve([[[0, 0, 0], [0, 2, 10], ['eye']]], 7), [[['0', '1', '5'], ['0', '2', '10']]])
    check('explicit sequence 5', solve([[[-12, 1, 0], [12, 1, 24], ['left', 'right']]], 7), [[['-7', '1', '5'], ['7', '1', '19']]])
    check('explicit sequence 6', solve([[[0, 1, 0], [12, 1, 12], ['left', 'right']]], 7), [[['0', '1', '0'], ['7', '1', '7']]])
    check('explicit sequence 7', solve([[[0, 1, 0], [1, 1, 1], ['eye', 'left', 'right']]], 7), [[['0', '1', '0'], ['1', '1', '1']]])
    check('explicit sequence 8', solve([[[-12, 0, 0], [12, 2, 24], ['left', 'right', 'eye']]], 7), [[['0', '1', '12'], ['12', '2', '24']]])
    check('explicit sequence 9', solve([[[-15, 1, 0], [-20, 1, 5], ['left']]], 7), [None])
    check('explicit sequence 10', solve([[[0, 0, 0], [0, 1, 1], ['eye']]], 7), [[['0', '1', '1'], ['0', '1', '1']]])
    check('explicit sequence 11', solve([[[-40, 0, 0], [40, 2, 24], ['right', 'eye']]], 7), [[['0', '1', '12'], ['280/33', '40/33', '160/11']]])
if N == 5:
    check('explicit sequence 0', solve([[[-12, 1, 0], [0, 1, 12], ['left']]], 8), [[['-8', '1', '4'], ['0', '1', '12']]])
    check('explicit sequence 1', solve([[[0, 1, 0], [12, 1, 12], ['right']]], 8), [[['0', '1', '0'], ['8', '1', '8']]])
    check('explicit sequence 2', solve([[[-20, 1, 0], [-15, 1, 5], ['left']]], 8), [None])
    check('explicit sequence 3', solve([[[-4, 1, 0], [-8, 2, 8], ['left']]], 8), [[['-4', '1', '0'], ['-8', '2', '8']]])
    check('explicit sequence 4', solve([[[0, 0, 0], [0, 2, 10], ['eye']]], 8), [[['0', '1', '5'], ['0', '2', '10']]])
    check('explicit sequence 5', solve([[[-12, 1, 0], [12, 1, 24], ['left', 'right']]], 8), [[['-8', '1', '4'], ['8', '1', '20']]])
    check('explicit sequence 6', solve([[[0, 1, 0], [12, 1, 12], ['left', 'right']]], 8), [[['0', '1', '0'], ['8', '1', '8']]])
    check('explicit sequence 7', solve([[[0, 1, 0], [1, 1, 1], ['eye', 'left', 'right']]], 8), [[['0', '1', '0'], ['1', '1', '1']]])
    check('explicit sequence 8', solve([[[-12, 0, 0], [12, 2, 24], ['left', 'right', 'eye']]], 8), [[['0', '1', '12'], ['12', '2', '24']]])
    check('explicit sequence 9', solve([[[-15, 1, 0], [-20, 1, 5], ['left']]], 8), [None])
    check('explicit sequence 10', solve([[[0, 0, 0], [0, 1, 1], ['eye']]], 8), [[['0', '1', '1'], ['0', '1', '1']]])
    check('explicit sequence 11', solve([[[-40, 0, 0], [40, 2, 24], ['right', 'eye']]], 8), [[['0', '1', '12'], ['10', '5/4', '15']]])
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[[['-12', '1', '0'], ['-4', '1', '8']]][[['-4', '1', '8'], ['0', '1', '12']]]Failed
explicit sequence 1[[['0', '1', '0'], ['4', '1', '4']]][[['0', '1', '0'], ['4', '1', '4']]]Passed
explicit sequence 2[None][None]Passed
explicit sequence 3[[['-4', '1', '0'], ['-8', '2', '8']]][[['-4', '1', '0'], ['-8', '2', '8']]]Passed
explicit sequence 4[[['0', '0', '0'], ['0', '1', '5']]][[['0', '1', '5'], ['0', '2', '10']]]Failed
explicit sequence 5[[['-12', '1', '0'], ['-4', '1', '8']]][[['-4', '1', '8'], ['4', '1', '16']]]Failed
explicit sequence 6[[['0', '1', '0'], ['4', '1', '4']]][[['0', '1', '0'], ['4', '1', '4']]]Passed
explicit sequence 7[[['0', '1', '0'], ['1', '1', '1']]][[['0', '1', '0'], ['1', '1', '1']]]Passed
explicit sequence 8[None][[['0', '1', '12'], ['6', '3/2', '18']]]Failed
explicit sequence 9[None][None]Passed
explicit sequence 10[[['0', '0', '0'], ['0', '1', '1']]][[['0', '1', '1'], ['0', '1', '1']]]Failed
explicit sequence 11[[['-40', '0', '0'], ['0', '1', '12']]][[['0', '1', '12'], ['40/9', '10/9', '40/3']]]Failed

SHA-256 / e20a4441e354612400958eb20e77215c4ad22b9da416057071e467f612ddf5aa

2 / The unsuccessful fix

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

N = 1
observations = []
def solve(commands, size):
    from fractions import Fraction
    out=[]
    for first,last,planes in commands:
        a=list(map(Fraction,first)); b=list(map(Fraction,last))
        original_a=list(a); original_b=list(b)
        rejected=False
        for plane in planes:
            def distance(p):
                if plane=='left': return p[0]+size*p[1]
                if plane=='right': return size*p[1]-p[0]
                return p[1]-1
            da=distance(a); db=distance(b)
            ia=da>=0; ib=db>=0
            if not ia and not ib: rejected=True; break
            if ia and ib: continue
            t=da/(da-db)
            point=[a[i]+t*(b[i]-a[i]) for i in range(3)]
            if not ia: a=point; b=point
            else: b=point
        out.append(None if rejected else [[str(v) for v in a],[str(v) for v in b]])
    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([[[-12, 1, 0], [0, 1, 12], ['left']]], 4), [[['-4', '1', '8'], ['0', '1', '12']]])
    check('explicit sequence 1', solve([[[0, 1, 0], [12, 1, 12], ['right']]], 4), [[['0', '1', '0'], ['4', '1', '4']]])
    check('explicit sequence 2', solve([[[-20, 1, 0], [-15, 1, 5], ['left']]], 4), [None])
    check('explicit sequence 3', solve([[[-4, 1, 0], [-8, 2, 8], ['left']]], 4), [[['-4', '1', '0'], ['-8', '2', '8']]])
    check('explicit sequence 4', solve([[[0, 0, 0], [0, 2, 10], ['eye']]], 4), [[['0', '1', '5'], ['0', '2', '10']]])
    check('explicit sequence 5', solve([[[-12, 1, 0], [12, 1, 24], ['left', 'right']]], 4), [[['-4', '1', '8'], ['4', '1', '16']]])
    check('explicit sequence 6', solve([[[0, 1, 0], [12, 1, 12], ['left', 'right']]], 4), [[['0', '1', '0'], ['4', '1', '4']]])
    check('explicit sequence 7', solve([[[0, 1, 0], [1, 1, 1], ['eye', 'left', 'right']]], 4), [[['0', '1', '0'], ['1', '1', '1']]])
    check('explicit sequence 8', solve([[[-12, 0, 0], [12, 2, 24], ['left', 'right', 'eye']]], 4), [[['0', '1', '12'], ['6', '3/2', '18']]])
    check('explicit sequence 9', solve([[[-15, 1, 0], [-20, 1, 5], ['left']]], 4), [None])
    check('explicit sequence 10', solve([[[0, 0, 0], [0, 1, 1], ['eye']]], 4), [[['0', '1', '1'], ['0', '1', '1']]])
    check('explicit sequence 11', solve([[[-40, 0, 0], [40, 2, 24], ['right', 'eye']]], 4), [[['0', '1', '12'], ['40/9', '10/9', '40/3']]])
if N == 2:
    check('explicit sequence 0', solve([[[-12, 1, 0], [0, 1, 12], ['left']]], 5), [[['-5', '1', '7'], ['0', '1', '12']]])
    check('explicit sequence 1', solve([[[0, 1, 0], [12, 1, 12], ['right']]], 5), [[['0', '1', '0'], ['5', '1', '5']]])
    check('explicit sequence 2', solve([[[-20, 1, 0], [-15, 1, 5], ['left']]], 5), [None])
    check('explicit sequence 3', solve([[[-4, 1, 0], [-8, 2, 8], ['left']]], 5), [[['-4', '1', '0'], ['-8', '2', '8']]])
    check('explicit sequence 4', solve([[[0, 0, 0], [0, 2, 10], ['eye']]], 5), [[['0', '1', '5'], ['0', '2', '10']]])
    check('explicit sequence 5', solve([[[-12, 1, 0], [12, 1, 24], ['left', 'right']]], 5), [[['-5', '1', '7'], ['5', '1', '17']]])
    check('explicit sequence 6', solve([[[0, 1, 0], [12, 1, 12], ['left', 'right']]], 5), [[['0', '1', '0'], ['5', '1', '5']]])
    check('explicit sequence 7', solve([[[0, 1, 0], [1, 1, 1], ['eye', 'left', 'right']]], 5), [[['0', '1', '0'], ['1', '1', '1']]])
    check('explicit sequence 8', solve([[[-12, 0, 0], [12, 2, 24], ['left', 'right', 'eye']]], 5), [[['0', '1', '12'], ['60/7', '12/7', '144/7']]])
    check('explicit sequence 9', solve([[[-15, 1, 0], [-20, 1, 5], ['left']]], 5), [None])
    check('explicit sequence 10', solve([[[0, 0, 0], [0, 1, 1], ['eye']]], 5), [[['0', '1', '1'], ['0', '1', '1']]])
    check('explicit sequence 11', solve([[[-40, 0, 0], [40, 2, 24], ['right', 'eye']]], 5), [[['0', '1', '12'], ['40/7', '8/7', '96/7']]])
if N == 3:
    check('explicit sequence 0', solve([[[-12, 1, 0], [0, 1, 12], ['left']]], 6), [[['-6', '1', '6'], ['0', '1', '12']]])
    check('explicit sequence 1', solve([[[0, 1, 0], [12, 1, 12], ['right']]], 6), [[['0', '1', '0'], ['6', '1', '6']]])
    check('explicit sequence 2', solve([[[-20, 1, 0], [-15, 1, 5], ['left']]], 6), [None])
    check('explicit sequence 3', solve([[[-4, 1, 0], [-8, 2, 8], ['left']]], 6), [[['-4', '1', '0'], ['-8', '2', '8']]])
    check('explicit sequence 4', solve([[[0, 0, 0], [0, 2, 10], ['eye']]], 6), [[['0', '1', '5'], ['0', '2', '10']]])
    check('explicit sequence 5', solve([[[-12, 1, 0], [12, 1, 24], ['left', 'right']]], 6), [[['-6', '1', '6'], ['6', '1', '18']]])
    check('explicit sequence 6', solve([[[0, 1, 0], [12, 1, 12], ['left', 'right']]], 6), [[['0', '1', '0'], ['6', '1', '6']]])
    check('explicit sequence 7', solve([[[0, 1, 0], [1, 1, 1], ['eye', 'left', 'right']]], 6), [[['0', '1', '0'], ['1', '1', '1']]])
    check('explicit sequence 8', solve([[[-12, 0, 0], [12, 2, 24], ['left', 'right', 'eye']]], 6), [[['0', '1', '12'], ['12', '2', '24']]])
    check('explicit sequence 9', solve([[[-15, 1, 0], [-20, 1, 5], ['left']]], 6), [None])
    check('explicit sequence 10', solve([[[0, 0, 0], [0, 1, 1], ['eye']]], 6), [[['0', '1', '1'], ['0', '1', '1']]])
    check('explicit sequence 11', solve([[[-40, 0, 0], [40, 2, 24], ['right', 'eye']]], 6), [[['0', '1', '12'], ['120/17', '20/17', '240/17']]])
if N == 4:
    check('explicit sequence 0', solve([[[-12, 1, 0], [0, 1, 12], ['left']]], 7), [[['-7', '1', '5'], ['0', '1', '12']]])
    check('explicit sequence 1', solve([[[0, 1, 0], [12, 1, 12], ['right']]], 7), [[['0', '1', '0'], ['7', '1', '7']]])
    check('explicit sequence 2', solve([[[-20, 1, 0], [-15, 1, 5], ['left']]], 7), [None])
    check('explicit sequence 3', solve([[[-4, 1, 0], [-8, 2, 8], ['left']]], 7), [[['-4', '1', '0'], ['-8', '2', '8']]])
    check('explicit sequence 4', solve([[[0, 0, 0], [0, 2, 10], ['eye']]], 7), [[['0', '1', '5'], ['0', '2', '10']]])
    check('explicit sequence 5', solve([[[-12, 1, 0], [12, 1, 24], ['left', 'right']]], 7), [[['-7', '1', '5'], ['7', '1', '19']]])
    check('explicit sequence 6', solve([[[0, 1, 0], [12, 1, 12], ['left', 'right']]], 7), [[['0', '1', '0'], ['7', '1', '7']]])
    check('explicit sequence 7', solve([[[0, 1, 0], [1, 1, 1], ['eye', 'left', 'right']]], 7), [[['0', '1', '0'], ['1', '1', '1']]])
    check('explicit sequence 8', solve([[[-12, 0, 0], [12, 2, 24], ['left', 'right', 'eye']]], 7), [[['0', '1', '12'], ['12', '2', '24']]])
    check('explicit sequence 9', solve([[[-15, 1, 0], [-20, 1, 5], ['left']]], 7), [None])
    check('explicit sequence 10', solve([[[0, 0, 0], [0, 1, 1], ['eye']]], 7), [[['0', '1', '1'], ['0', '1', '1']]])
    check('explicit sequence 11', solve([[[-40, 0, 0], [40, 2, 24], ['right', 'eye']]], 7), [[['0', '1', '12'], ['280/33', '40/33', '160/11']]])
if N == 5:
    check('explicit sequence 0', solve([[[-12, 1, 0], [0, 1, 12], ['left']]], 8), [[['-8', '1', '4'], ['0', '1', '12']]])
    check('explicit sequence 1', solve([[[0, 1, 0], [12, 1, 12], ['right']]], 8), [[['0', '1', '0'], ['8', '1', '8']]])
    check('explicit sequence 2', solve([[[-20, 1, 0], [-15, 1, 5], ['left']]], 8), [None])
    check('explicit sequence 3', solve([[[-4, 1, 0], [-8, 2, 8], ['left']]], 8), [[['-4', '1', '0'], ['-8', '2', '8']]])
    check('explicit sequence 4', solve([[[0, 0, 0], [0, 2, 10], ['eye']]], 8), [[['0', '1', '5'], ['0', '2', '10']]])
    check('explicit sequence 5', solve([[[-12, 1, 0], [12, 1, 24], ['left', 'right']]], 8), [[['-8', '1', '4'], ['8', '1', '20']]])
    check('explicit sequence 6', solve([[[0, 1, 0], [12, 1, 12], ['left', 'right']]], 8), [[['0', '1', '0'], ['8', '1', '8']]])
    check('explicit sequence 7', solve([[[0, 1, 0], [1, 1, 1], ['eye', 'left', 'right']]], 8), [[['0', '1', '0'], ['1', '1', '1']]])
    check('explicit sequence 8', solve([[[-12, 0, 0], [12, 2, 24], ['left', 'right', 'eye']]], 8), [[['0', '1', '12'], ['12', '2', '24']]])
    check('explicit sequence 9', solve([[[-15, 1, 0], [-20, 1, 5], ['left']]], 8), [None])
    check('explicit sequence 10', solve([[[0, 0, 0], [0, 1, 1], ['eye']]], 8), [[['0', '1', '1'], ['0', '1', '1']]])
    check('explicit sequence 11', solve([[[-40, 0, 0], [40, 2, 24], ['right', 'eye']]], 8), [[['0', '1', '12'], ['10', '5/4', '15']]])
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[[['-4', '1', '8'], ['-4', '1', '8']]][[['-4', '1', '8'], ['0', '1', '12']]]Failed
explicit sequence 1[[['0', '1', '0'], ['4', '1', '4']]][[['0', '1', '0'], ['4', '1', '4']]]Passed
explicit sequence 2[None][None]Passed
explicit sequence 3[[['-4', '1', '0'], ['-8', '2', '8']]][[['-4', '1', '0'], ['-8', '2', '8']]]Passed
explicit sequence 4[[['0', '1', '5'], ['0', '1', '5']]][[['0', '1', '5'], ['0', '2', '10']]]Failed
explicit sequence 5[[['-4', '1', '8'], ['-4', '1', '8']]][[['-4', '1', '8'], ['4', '1', '16']]]Failed
explicit sequence 6[[['0', '1', '0'], ['4', '1', '4']]][[['0', '1', '0'], ['4', '1', '4']]]Passed
explicit sequence 7[[['0', '1', '0'], ['1', '1', '1']]][[['0', '1', '0'], ['1', '1', '1']]]Passed
explicit sequence 8[None][[['0', '1', '12'], ['6', '3/2', '18']]]Failed
explicit sequence 9[None][None]Passed
explicit sequence 10[[['0', '1', '1'], ['0', '1', '1']]][[['0', '1', '1'], ['0', '1', '1']]]Passed
explicit sequence 11[[['0', '1', '12'], ['0', '1', '12']]][[['0', '1', '12'], ['40/9', '10/9', '40/3']]]Failed

SHA-256 / 54aaca4748ef9a5b6c88f793dcb46b286eaa5ecb50fd4c1ccefbbd229373a991

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.

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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 2026-09-29T14:45:14.789030+00:00.

Case digest / 73dddcb6bec49223b49ce1b4cfd23ec54c44c25faf887098ed8d2831c494cc6a