bugfix: Prevent building crash damage from dealing damage to other objects

[Stubbjax]

This change prevents collateral damage caused by VehicleCrashesIntoBuildingWeapon when a dead vehicle collides with a building. This fix is supplemental to #2204.

Before

The Tank Hunters receive damage if the dead Helix collides with the Bunker

INJURED.mp4

After

The Tank Hunters no longer receive damage if the dead Helix collides with the Bunker

HEALTHY.mp4

[greptile-apps]

Greptile Summary

This PR fixes collateral damage caused by VehicleCrashesIntoBuildingWeapon when a dead vehicle collides with a building, supplementing the earlier fix in #2204. Under RETAIL_COMPATIBLE_CRC the original createAndFireTempWeapon path (which fires an AoE explosion affecting nearby units) is preserved; outside retail mode a targeted DamageInfo is built and applied directly to the building only.

• The new DamageInfo construction mirrors the pattern in Weapon.cpp::dealDamageInternal, setting m_damageType, m_deathType, m_sourceID, m_sourcePlayerMask, and m_amount — all required fields.
• The null guard if (weaponTemplate != nullptr) addresses the previously flagged crash risk when the template is absent; FXList::doFXObj is a null-safe static wrapper so a missing FireFX is also safe.
• Both the Generals/ and GeneralsMD/ copies receive identical changes, as expected for a parity fix.

Confidence Score: 5/5

Safe to merge — the change is narrow, correctly guards against a null weapon template, and applies damage only to the building using the same DamageInfo pattern used throughout the engine.

The fix is self-contained: it replaces an AoE weapon fire with a direct single-target damage call, uses the standard DamageInfo field set that matches Weapon.cpp, includes the null guard for the weapon template, and relies on the null-safe FXList::doFXObj static wrapper. No regressions are introduced in the retail path, which is left unchanged.

No files require special attention.

Important Files Changed

Filename	Overview
Generals/Code/GameEngine/Source/GameLogic/Object/Update/PhysicsUpdate.cpp	Adds non-retail path that applies crash damage directly to the struck building via DamageInfo rather than firing an AoE weapon; null guard and FX call are both safe.
GeneralsMD/Code/GameEngine/Source/GameLogic/Object/Update/PhysicsUpdate.cpp	Zero Hour counterpart receives the identical change; no issues found.

Sequence Diagram

sequenceDiagram
    participant Physics as PhysicsBehavior::onCollide
    participant WT as WeaponTemplate
    participant WS as WeaponStore
    participant Bldg as Building (other)
    participant FX as FXList

    Note over Physics: Vehicle falls into structure

    alt RETAIL_COMPATIBLE_CRC
        Physics->>WS: createAndFireTempWeapon(template, obj, pos)
        WS->>Bldg: AoE explosion — damages building AND nearby units
    else Non-retail (this PR)
        Physics->>WT: getDamageType / getDeathType / getPrimaryDamage
        WT-->>Physics: damage values
        Note over Physics: weaponTemplate nullptr check
        Physics->>Bldg: attemptDamage(DamageInfo) — building only
        Physics->>FX: doFXObj(getFireFX, obj) — visual effect only
    end

    Physics->>Physics: destroyObject(obj)

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_{Reviews (3): Last reviewed commit: "tweak: Assign source player mask" | Re-trigger Greptile}