#96: instrument the myomer heat model -- per-mech profile CONFIRMED, overheat cause LOCATED
Two player claims, both now answered from the decomp + measurement rather than
inference.
THE EQUATION (FUN_004b8d18, constants read from the image: _DAT_004b8ee4=0.5,
_DAT_004b8ee8=0.0 (the fabs), _DAT_004b8eec=1.0):
heat += ratio^2 * (1+damageLevel) *
[ (1-accEff)*|vy|*m*g*dt climb POWER
+ (1-velEff)*(0.5*m*|v|^2) kinetic ENERGY -- NO dt
+ (1-accEff)*|v|*|a|*m*dt ] accel POWER
Our implementation already reproduces this verbatim, dt-less term included.
CLAIM 1 -- "each mech has a unique heating profile". TRUE, and working, but NOT
by the mechanism the player described. Measured across thr1/own1/mad1/vul1:
* the myomer record is IDENTICAL on every chassis
(velEff 0.995, accEff 0.8, gears 3000/5000/7000/9999, rec 2,
degradeT 1000, failT 2000, thermalMass 250000)
* the heat-family COUNT is identical too -- 6 Condensers, 1 HeatSinkBank,
1 Reservoir, 4 Generators on all four
* every cooling parameter is byte-identical Thor vs Owens (condenser
conductance 315000 / mass 420000, bank 231000 / 1.39e6, reservoir
190000 / 3.42e6)
So there is NO authored per-chassis cooling variation. The profile emerges from
the equation instead: heat ~ m*v^2, and light mechs are faster. Measured at
seek 4, flat out:
thr1 mass 70000 |v| 11.34 kinetic/tick 49026
own1 mass 35000 |v| 17.22 kinetic/tick 57350
The Owens is HALF the mass and generates 17% MORE drive heat, because v^2 beats
m. That reproduces the player's OUTCOME (a Thor sustains seek 4, a light
chicken-walker cannot) via speed, not heatsink count.
CLAIM 2 -- "it runs too hot". The kinetic term carries NO dt: it adds an ENERGY
every TICK, so its contribution per SECOND scales with the tick rate. Measured
dt here is ~0.017 (~59Hz) and variable. The other two terms are power terms and
are rate-independent. On flat ground the climb term is additionally dead --
gravity reads 0 (the carried "environment gravity unwired" open), so hills do not
heat at all right now.
NOT yet established: the 1995 tick rate the dt-less term was calibrated against.
Until that is pinned the OVERHEAT FACTOR is unquantified -- flagged, not guessed.
Adds three diagnostics, all under BT_MYO_LOG:
[myoheat] now splits climb/kinetic/accel + dt + the kinetic share
[myoparm] one line per myomer: efficiencies, gears, thermal thresholds
[hsparm] one line per heat subsystem: conductance + thermal mass
and three benches (myoheat/myoparm/myocmp) that produced the tables above.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
This commit is contained in:
Joe DiPrima
co-authored by
Claude Opus 5
Claude Opus 5
parent
56f15b569a
commit
9dd7d48b41
@@ -546,6 +546,19 @@ HeatSink::HeatSink(
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pendingHeat = 0.0f;
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// #96 -- "each mech has a unique heating profile". The heat-family COUNT is
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// identical on every chassis (6 condensers, 1 bank, 1 reservoir), so if
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// per-mech cooling variation exists it must live in these authored values.
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// Dump them so that is a measured fact rather than an assumption.
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if (getenv("BT_MYO_LOG"))
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DEBUG_STREAM << "[hsparm] " << (GetName() ? GetName() : "?")
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<< " startT=" << startingTemperature
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<< " degradeT=" << degradationTemperature
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<< " failT=" << failureTemperature
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<< " conductance=" << thermalConductance
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<< " thermalMass=" << thermalMass
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<< "\n" << std::flush;
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//
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// A "master" heat sink (segment flagged 0x100, not a sub-/damaged copy)
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// drives the per-frame thermal simulation.
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@@ -229,6 +229,25 @@ Myomers::Myomers(
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recommendedSeekVoltageIndex = resource->seekVoltageRecommendedIndex; // @0x324 res+0x1AC
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currentSeekVoltageIndex = recommendedSeekVoltageIndex; // @0x320
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minSeekVoltageIndex = 0; // @0x328
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// #96 -- "each mech has a unique heating profile". Dump what THIS mech's
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// myomer record actually streamed, so per-chassis variation is a measured
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// fact rather than an assumption. One line per myomer built.
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if (getenv("BT_MYO_LOG"))
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{
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DEBUG_STREAM << "[myoparm] " << (GetName() ? GetName() : "?")
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<< " velEff=" << velocityEfficiency
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<< " accEff=" << accelerationEfficiency
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<< " gears=[";
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for (int g = 0; g <= maxSeekVoltageIndex && g < 5; ++g)
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DEBUG_STREAM << (g ? "," : "") << seekVoltage[g];
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DEBUG_STREAM << "] rec=" << recommendedSeekVoltageIndex
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<< " max=" << maxSeekVoltageIndex
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<< " degradeT=" << degradationTemperature
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<< " failT=" << failureTemperature
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<< " thermalMass=" << thermalMass
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<< "\n" << std::flush;
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}
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}
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@@ -726,20 +745,31 @@ void Myomers::MyomersDriveHeat(Scalar time_slice)
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// accTerm = m |v| |a| dt (acceleration power)
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Scalar work = mass * (velMag * velMag) * 0.5f; // dot(v,v)*0.5 (_DAT_004b8ee4)
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pendingHeat /* @0x1C8 */ +=
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ratio * ratio * damageGain *
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( velComplement * vy * mass * gravity * time_slice
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+ workComplement * work
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+ velComplement * velMag * accMag * mass * time_slice );
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// The three terms, kept separate for diagnosis (#96 "myomers run too hot"):
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// two are POWER (x dt), one is an ENERGY added per TICK.
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Scalar termClimb = velComplement * vy * mass * gravity * time_slice;
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Scalar termKinetic = workComplement * work; // <-- no dt, per the binary
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Scalar termAccel = velComplement * velMag * accMag * mass * time_slice;
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Scalar gain = ratio * ratio * damageGain;
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pendingHeat /* @0x1C8 */ += gain * (termClimb + termKinetic + termAccel);
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if (getenv("BT_MYO_LOG"))
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{
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static int s_n = 0;
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if ((s_n++ % 120) == 0)
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{
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Scalar sum = termClimb + termKinetic + termAccel;
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DEBUG_STREAM << "[myoheat] v=" << velMag << " a=" << accMag
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<< " m=" << mass << " g=" << gravity
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<< " ratio=" << ratio << " dmgGain=" << damageGain
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<< " dt=" << time_slice
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<< " | climb=" << (gain * termClimb)
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<< " kinetic=" << (gain * termKinetic)
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<< " accel=" << (gain * termAccel)
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<< " kineticShare=" << (sum != 0.0f ? (termKinetic / sum) : 0.0f)
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<< " pending=" << pendingHeat << "\n" << std::flush;
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}
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}
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}
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@@ -0,0 +1,19 @@
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#!/usr/bin/env bash
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# #96: compare myomer heat GENERATION between chassis at seek 4, flat out.
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# Cooling capacity is identical across chassis (measured), and heat ~ m*v^2, so
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# a light fast mech may out-heat a heavy slow one despite half the mass.
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set -x
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. /c/git/bt411/scratchpad/night6/bench_common.sh
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cd /c/git/bt411/content || exit 1
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V="$1"
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taskkill //F //IM btl4.exe > /dev/null 2>&1
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sleep 2
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sed "s/^map=.*/map=grass/; s/^time=.*/time=day/; 0,/^vehicle=.*/s//vehicle=$V/" MP.EGG > MYOC.EGG
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LOG=myocmp_$V.log
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rm -f "$LOG"
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export BT_MYO_LOG=1 BT_FORCE_SEEK=3
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export BT_GOTO="1500 1500"
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bt_launch "$LOG" MYOC.EGG 0x03
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sleep 100
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taskkill //F //IM btl4.exe > /dev/null 2>&1
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sleep 2
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@@ -0,0 +1,29 @@
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#!/usr/bin/env bash
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# #96: WHY do the myomers run too hot? Split the heat into its three terms.
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#
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# The binary's integrator (FUN_004b8d18, constants 0.5 / 0.0 / 1.0 verified):
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# heat += ratio^2 * (1+damage) * [ (1-effA)*|vy|*m*g*dt climb POWER
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# + (1-effV)*(0.5*m*|v|^2) kinetic ENERGY, NO dt
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# + (1-effA)*|v|*|a|*m*dt ] accel POWER
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# Two terms are power (x dt); the kinetic one is an ENERGY added PER TICK, so its
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# contribution per SECOND scales with the tick rate. On flat ground at steady
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# speed vy~0 and |a|~0, which should leave the dt-less term carrying nearly all
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# of the heat. BT_MYO_LOG now prints the split.
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set -x
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. /c/git/bt411/scratchpad/night6/bench_common.sh
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cd /c/git/bt411/content || exit 1
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taskkill //F //IM btl4.exe > /dev/null 2>&1
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sleep 2
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sed "s/^map=.*/map=grass/; s/^time=.*/time=day/" MP.EGG > MYO.EGG
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LOG=myoheat_${1:-seek4}.log
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rm -f "$LOG"
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# Run flat out in the top gear, straight line, no combat.
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export BT_MYO_LOG=1 BT_DRIVE_LOG=1 BT_FORCE_SEEK=${2:-3}
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export BT_SPAWN_ENEMY=1 # a SECOND chassis -> one run dumps two myomer records
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export BT_GOTO="1500 1500"
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bt_launch "$LOG" MYO.EGG 0x03
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sleep 90
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taskkill //F //IM btl4.exe > /dev/null 2>&1
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sleep 2
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echo "=== heat term split ==="
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grep -oE "\[myoheat\][^\n]*" "$LOG" | tail -6
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@@ -0,0 +1,20 @@
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#!/usr/bin/env bash
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# #96 Q1: "each mech has a unique heating profile" -- is the myomer record
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# per-chassis, or shared? Build one mech per run and dump what it streamed.
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# Oracle's example is the pair thr1 (Thor, sustains seek 4) vs own1 (Owens,
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# a light chicken-walker that cannot).
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set -x
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. /c/git/bt411/scratchpad/night6/bench_common.sh
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cd /c/git/bt411/content || exit 1
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V="$1"
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taskkill //F //IM btl4.exe > /dev/null 2>&1
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sleep 2
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# swap the FIRST pilot's vehicle -- that is the one solo flies
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sed "s/^map=.*/map=grass/; s/^time=.*/time=day/; 0,/^vehicle=.*/s//vehicle=$V/" MP.EGG > MYOP.EGG
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LOG=myoparm_$V.log
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rm -f "$LOG"
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export BT_MYO_LOG=1 BT_ROSTER=1
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bt_launch "$LOG" MYOP.EGG 0x03
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sleep 70
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taskkill //F //IM btl4.exe > /dev/null 2>&1
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sleep 2
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