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Combat: FIX weapon effectiveRange -- it degraded with heatLoad, not host-zone damage (task #50)

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MechWeapon::UpdateTargeting computed effectiveRange = (1 - heatLoad) * weaponRange,
reading the weapon's own inherited HeatableSubsystem heatLoad. The authentic decomp
(@004b9bdc:6983) reads *(weapon+0xE0)+0x158 = Subsystem::damageZone->damageLevel --
i.e. effectiveRange = (1 - HOST-ZONE DAMAGE) * weaponRange. Same @0xE0-DamageZone-vs-
heat misattribution already corrected in HeatSink::UpdateCoolant (heat.cpp:803).

Impact: for a charge/discharge weapon (ER laser) the weapon's OWN heatLoad swings
0..1 every fire cycle, so effectiveRange collapsed toward 0 and the weapon was
perpetually "out of range" -> Emitter::FireWeapon's `if (dist <= effectiveRange)`
gate skipped SendDamageMessage -> NO damage submission and hence NO impact explosion.
The beam still rendered (beamFlag/beamEndpoint set before the gate), so the shot LOOKED
like a hit but did nothing -- the user-reported "lackluster/absent laser hits, esp.
the ER medium, on mechs AND buildings". PPCs mostly worked only because their heatLoad
happened to sit low/stable.

Fix: read the QUALIFIED this->Subsystem::damageZone->damageLevel (the MechSubsystem
shadow is a shim -- heat.cpp:812) so an UNDAMAGED weapon holds its full, STABLE
weaponRange, and range shortens only as the weapon's host zone takes battle damage.

Verified (parked in range of a building, autofire): laser effRange 500 STABLE
(was fluctuating 0/59/340/424 -> mostly out of range); impact explosions 13 in 22s
(11 laser id=16 + 2 PPC), up from ~2. Lasers now consistently damage + spawn FX.

Also adds env-gated diagnostics used to root-cause this: [fireW] range trace +
per-weapon explID (emitter.cpp), and BT_FIRE_AT_STRUCT (mech4.cpp) which designates
the nearest world structure so weapon-vs-structure fire can be tested without the
screen aim ray.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
This commit is contained in:
arcattack
2026-07-15 11:31:47 -05:00
co-authored by Claude Opus 4.8
parent de8f6d02c1
commit aab7a8a137
4 changed files with 72 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files
game/reconstructed/emitter.cpp
+10
View File
@@ -271,6 +271,15 @@ void
Scalar dist = (Scalar)Sqrt(delta.x*delta.x + delta.y*delta.y + delta.z*delta.z); // FUN_004dd138
beamScale.z = dist / graphicLength; // 0x434 (== beamScale[2]) = dist / 0x438
if (getenv("BT_FIRE_LOG"))
{
Entity *st = (owner != 0) ? *(Entity **)((char *)owner + 0x388) : 0;
DEBUG_STREAM << "[fireW] " << GetName() << " dist=" << (float)dist
<< " effRange=" << (float)effectiveRange
<< " inRange=" << (int)(dist <= effectiveRange)
<< " explID=" << (long)GetExplosionResourceID()
<< " tgt=" << (void *)st << "\n" << std::flush;
}
if (dist <= effectiveRange) // this+0x328
{
// THE AUTHENTIC DAMAGE SUBMISSION (task #8; binary @004bace8:7758-7764):
@@ -349,6 +358,7 @@ void
<< " pct=" << (float)rechargeLevel
<< " tgt=" << (void *)((owner != 0)
? *(Entity **)((char *)owner + 0x388) : 0)
<< " explID=" << (long)GetExplosionResourceID()
<< std::endl;
}
targetWithinRange = UpdateTargeting(); // @004b9bdc -> this+0x34c