Files
BT411/scratchpad/night11/twistsign.sh
T
Joe DiPrimaandClaude Fable 5 1f995ee35a #124 twist-sign VERIFIED correct (live missile bench) + the rig to do it
The frame-adapter's inferred twist-sign flip (SelectSlice theta -= twist,
vs the binary's += pre-reflection) was the last unverified half of #124 --
every earlier probe ran at twist 0.  Bench: stationary madcat target with
the torso PINNED at 0 / +140 / -140 deg, LRM salvos from a fixed shooter
(missiles = the authentic cylinder path; the binary DROPPED zone -1 beam
damage).  Result: slice picks track the physically-facing flank in BOTH
directions (twist-left -> right-family zones for left-flank impacts,
twist-right -> left-family), deterministic, wrong-sign outcome (slice 7
vs observed slice 1) clearly excluded.  No game-code change needed.

Instrumentation added (all env-gated):
- torso.cpp BT_FORCE_TWIST=<-1..1>: HOLD the sim's analogTwistAxis (the
  input-level pin was dead -- live input rides the CONTROLS.MAP device
  push, and Basic mode auto-centers; sim-level is plumbing-independent).
- dmgtable.cpp [slice] line: rot flag, live twist, thetaIn/thetaAdj,
  chosen slice -- the weighted leaf roll made zone-only logs ambiguous.
- [dmgresolve] now names the zone (BTMechZoneSegAndName).
- mech4.cpp BT_FORCE_TWIST input pin + one-shot mode cycle (kept as doc
  of the dead path), mechmppr [mppr] mode probe.
- scratchpad/night11/twistsign.sh: the 3-config bench.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
2026-08-04 15:49:14 -05:00

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#!/usr/bin/env bash
# #124 TWIST-SIGN VERIFY -- the follow-up the frame-adapter work left open:
# SelectSlice's torso-twist term sign was INFERRED from the z-negation
# reflection, never exercised (every probe ran at twist 0). Rig: stationary
# madcat TARGET pinned at full twist (BT_FORCE_TWIST, rate-demand axis ->
# slews to the per-mech limit and holds), shooter approaches to a fixed
# bearing and pulses LRM salvos (BT_AF_MISSILE -- missiles are the authentic
# cylinder-path weapon; beams with zone -1 were DROPPED by the binary).
# Two configs: twist +1 vs -1. READ: target's [dmgresolve] zone spread --
# hull-fixed wheels (legs/hip) must NOT move between runs (control); torso
# wheels must swap L/R families to match the flank visibly facing the
# shooter (A's BT_SHOT captures are the ground truth).
set -x
. /c/git/bt411/scratchpad/night6/bench_common.sh
cd /c/git/bt411/content || exit 1
bt_assert_player_env
for TW in 0 +1 -1; do
TAG=Z; [ "$TW" = "+1" ] && TAG=P; [ "$TW" = "-1" ] && TAG=N
taskkill //F //IM btl4.exe > /dev/null 2>&1
sleep 2
rm -f ts_${TAG}_a.log ts_${TAG}_b.log ts${TAG}_*.png
bt_expert_egg MP.EGG TS.EGG
sed -i "s/^map=.*/map=grass/; s/^time=.*/time=day/; s/^vehicle=.*/vehicle=madcat/" TS.EGG
# TARGET: stationary, torso pinned; log every cylinder resolution.
BT_FORCE_TWIST=$TW BT_DMGTABLE_LOG=1 BT_CYL_LOG=1 BT_DMG_LOG=1 BT_MP_LOG=1 \
bt_launch ts_${TAG}_b.log TS.EGG 0x0C -net 1601
sleep 2
# SHOOTER: approach to fixed range, missile salvos only, periodic captures.
BT_GOTO=enemy BT_GOTO_STOP=90 BT_KEY_NOFOCUS=1 \
BT_AF_MISSILE=1 BT_AF_PERIOD=6 \
BT_DMG_LOG=1 BT_MP_LOG=1 BT_SHOT_EVERY=300 BT_SHOT_PREFIX=ts$TAG \
bt_launch ts_${TAG}_a.log TS.EGG 0x03 -net 1501
sleep 5
python ../tools/btconsole.py TS.EGG 127.0.0.1:1501 127.0.0.1:1601 \
> ts_${TAG}_relay.log 2>&1 &
RELAY=$!
sleep 170
kill $RELAY 2>/dev/null
taskkill //F //IM btl4.exe > /dev/null 2>&1
sleep 3
done
echo "=== resolves per run:"
grep -c dmgresolve ts_Z_b.log ts_P_b.log ts_N_b.log