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#124 CORRECTION: the frame adapter is a Z-REFLECTION, not a pi rotation --

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proven by the mech's own pods

The first fix (c5dfb00) negated x AND z. The operator challenged it:
'they couldn't hit rear panels AT ALL -- a 180 rotation couldn't explain
that' -- and a rotation would also have relocated rear damage, not
erased it, while the bench premise (the dummy faces its attacker) was
assumed, never measured.

The zero-premise probe (BT_ASPECT_TEST): four self-impacts at known
WORLD cardinals + one at each weapon's PHYSICAL MUZZLE position -- the
mech's own asymmetric geometry as the left/right anchor. Measured:

* WorldToLocal is a clean R(yaw), no hidden terms (yaws -30/150/40 deg
  all consistent);
* our frame: RIGHT = +X -- SAME as the 1995 ring (W0/W7 = Right*) --
  and FORWARD = -Z, flipped vs the ring's Front*-in-+Z-arc;
* under the pi rotation the pods CROSSED (left muzzle -> rtorso);
  under z-negation every anchor lands its own side.

So: negate local z only, and -- since a reflection reverses angular
direction -- the SelectSlice torso-twist term flips sign with it
(twist was 0 in all probes; twisted-torso verify tracked on #124).

Anchor acceptance (fresh exe, third yaw): LRM15_1 left pod -> ltorso,
LRM15_2 -> right wedges, left/right arm muzzles -> larm/rarm, nose ->
front cells, tail -> rear cells, flank cardinals -> rgun / left wedges.

The BT_ASPECT_TEST probe + BTWeaponMuzzleWorld bridge stay as bench
scalpels.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
This commit is contained in:
Joe DiPrima
2026-08-03 09:05:35 -05:00
co-authored by Claude Fable 5
parent c5dfb002f3
commit b0b7adc4ea
4 changed files with 114 additions and 24 deletions
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game/reconstructed/dmgtable.cpp
+21 -15
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@@ -177,7 +177,11 @@ DamageZonePercentTable *
if (rotateWithTorso) // binary this[3] != 0
{
theta += owner->TorsoHeading(); // torso+0x1d8
// #124 frame adapter, angular half: theta arrives in the 1995 frame
// (ResolveHit's z-reflection), so the twist -- measured in OUR frame
// -- enters with the OPPOSITE sign (a reflection reverses angular
// direction). Binary form: theta += torso+0x1d8.
theta -= owner->TorsoHeading(); // torso+0x1d8 (sign: see adapter)
if (theta >= TwoPi) theta -= TwoPi;
if (theta < 0.0f) theta += TwoPi;
}
@@ -277,20 +281,22 @@ int
Scalar heightRef = owner->CylinderReferenceHeight(); // owner+0x2ec[+0xc]
if (heightRef <= 0.0f) return -1;
// PORT FRAME ADAPTER (#124, measured 2026-08-03). The 1995 resolver frame
// carries the mech's FORWARD along +Z: the authored wedge ring puts the
// FrontChest-family cells in the +Z arc (slice-name audit [T1]) -- frontal
// hits MUST read z > 0 for the shipped tables to mean what they say. Our
// engine's entity frame carries forward along -Z (bench 2026-08-03: the
// dummy facing its attacker takes frontal beams at local z = -4..-10,
// theta ~270 deg, resolving the REAR-named cells; the night-10 field table
// -- rear panels unhittable, Owens left torso -> RIGHT pod -- is this same
// pi ROTATION at every aspect: rotation, not reflection, because the
// left/right flanks CROSS rather than persist). Express the impact in the
// cylinder's frame: rotate pi about Y. y (the band axis) is untouched,
// and the frames share handedness, so the torso-twist add in SelectSlice
// keeps its sign.
local.x = -local.x;
// PORT FRAME ADAPTER (#124, corrected 2026-08-03 by the MUZZLE-ANCHOR
// probe). The 1995 resolver frame: FORWARD = +Z (the authored ring puts
// Front* cells in the +Z arc) and RIGHT = +X (W0/W7 = "Right*") [T1
// slice-name data]. Our engine frame, measured with the mech's own
// asymmetric geometry as the anchor (BT_ASPECT_TEST muzzle probes -- the
// LEFT missile pod LRM15_1 sits at raw local x=-2.32, the RIGHT pod
// LRM15_2 at x=+2.32): RIGHT = +X (SAME as 1995) but FORWARD = -Z
// (drive-code convention, "forward = -Z at heading 0"). The frames
// therefore differ by a Z-NEGATION ONLY -- a REFLECTION, not the pi
// rotation first committed (that crossed the pods: left muzzle resolved
// rtorso). y (the band axis) untouched.
//
// A reflection reverses the angular walk direction, so the OTHER angular
// input -- the torso-twist term SelectSlice adds -- must flip sign with
// it (applied there, same adapter). Twist was 0 in every probe; the
// twisted-torso verify is the follow-up on #124.
local.z = -local.z;
// --- height -> layer (penetration depth) ---