FireControl.Commit used to place a hit with a coin flip between exactly
the aimed item and a uniform-random hull cell -- no spatial term, so a
near-miss on a stern item was as likely to land in the bow as the stern.
One Gaussian kernel, in hull-schematic cell units, now decides both
halves of "where will this shot go": w(cell) = exp(-d^2/2*sigma^2) over
every occupied cell, sigma = 1/Precision. HitProbability folds the
kernel's on-hull mass share (pOnHull) into PBase at fire time (R10/Q6
unaffected); Commit draws the landing cell from the same weights. A shot
that passes the roll always lands on metal -- the off-hull chance is
priced into that one roll, never resolved as a second miss stage. The
uniform-random branch is deleted outright, not demoted.
Precision now feeds every shot's pOnHull, aimed or not, so its unaided
fallback (FireControl.Precision) reads GameplaySettings.UnaidedPrecision
instead of a bare 0 -- the same shape as the existing UnaidedAccuracy/
UnaidedTracking floors. pOnHull is saturated: the discrete sum over-
estimates the continuous kernel's integral once sigma drops below about
one cell, and a mass share cannot exceed the whole kernel.
Existing fixtures across FireAuthorityTests, FireControlCut4/5/6Tests and
TargetingSystemTests authored Precision as 0 (or relied on the old 0
fallback) purely as a don't-care value under the coin-flip rule, where it
only gated the aimed-item branch. Under the kernel it drives every shot's
sigma, so those fixtures are re-authored to keep pOnHull near its
ceiling and stay pinned on what they actually test.
mutation_tests_fire_control_cut3.sh's two anchors into HitProbability's
return line and the deleted coin-flip branch are updated to the
equivalent lines/mutations on the new code.
ConstantWeaponObeysArc only asserted PowerRequest()==0 after Zone.Update had
already run Execute, which safes _firing off for its own (also-correct)
reason first. PowerRequest short-circuits on _firing regardless of what
ArcAllowsFire mutates to, so a mutation dropping ArcAllowsFire from
PowerRequest alone was an unpinned survivor even though the harness's own
Execute-line mutation was already caught. Added the same assertion before
Zone.Update, while _firing is still true and StanceAllowsFire is true, so
ArcAllowsFire is the only thing it can be testing.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
The multi-tick, many-Update-call version of this test (5.1) was flaky under
repeated runs: stepping a 5s flight in 50 separate .1s ticks left the exact
commit-time reading of `now` sensitive to float-accumulation/JIT-tiering
drift, occasionally producing zero hits across all 30 shots even on
unmutated code. Rewritten with velocity 0 so each shot's flight time (and so
its commit horizon) is zero -- one Fire call, one Update call, no
accumulated ticks to drift. Confirmed clean across repeated standalone runs
and still kills the 5.1 fallback-to-0f mutation.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Soul's pass over the whole campaign confirmed eleven findings. Seven were code
defects of one shape -- a rule implemented on one path and left off the path
beside it -- and this is all seven.
5.1 Tracking falls back to GameplaySettings.UnaidedTracking (new, 10) instead of
zero, and Commit drops the zero branch that turned a Tracking-less shooter
into a hard wall. Unaided fire was meant to be really, really bad; it was
334 shots and no hits against a target drifting at 5 u/s.
5.2 A shot the shield cannot absorb now breaks it. The decision is frozen into
ShotOutcome.ShieldBroken at commit and performed in Apply, so a shield that
recharges mid-flight cannot retroactively survive. Splash already did this;
the discrete roll never did, which made the whole shield-break mechanic
unreachable for every weapon in the catalog.
5.3 ConstantWeapon gates on ArcAllowsFire alongside StanceAllowsFire. A
side-mounted beam was firing forward.
5.4 The point-blank bearing case moves out of Weapon.ArcAllowsFire and into
InArc, which used to normalize the zero vector into NaN. The trigger said
fire and the probability said impossible.
5.5 A destroyed item drops out of IsRevealed's ranking, so Precision stops
concentrating hits onto a dead subsystem's footprint.
5.6 Zone subscribes Entity.Death and removes the corpse itself. That removal
lived only in Unity's loot-drop subscription, so headless nothing ever left
the zone, shots landed on corpses and no fight could end.
5.7 PendingShot drops PredictedIntercept and FlightTime, written and read
nowhere.
208 tests pass (197 plus eleven new).
Known defect, recorded rather than hidden: the committed mutation harness is
unreliable. Across two runs it failed to restore FireControl.cs and Weapon.cs,
leaving live mutations in the working tree -- including its own 5.1 mutation,
which is how a green suite briefly reported two failures. Its verdicts are
therefore evidence only where re-run from a verified-clean tree. Two anchors
(Zone.cs's ObserveAdd line, Weapon.cs's InArc return) fail to match at all, and
5.3's ConstantWeaponObeysArc survives its own mutation, so that rule is written
but not pinned. Cut 5b owns the repair; nothing here is trusted on the harness's
word, and the suite result above was taken by hand from a hash-verified tree.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
