World-pick targeting: 0x388 = whatever is downrange -- mech, terrain, or nothing (task #41)

User video evidence (lasers firing at nothing) + the colleague's
torso-locked report + the binary all reconcile into one model:

The boresight pick hits the WORLD, and the target slot mech+0x388 holds
whatever entity is downrange:
- enemy mech under the boresight -> aimed target (hull point -> STEP-6
  zone under the boresight, hotbox + lock ring, damage);
- else the TERRAIN downrange (BTGroundRayHit to 1200) -> the beam and
  missiles fire at the scenery ("firing at nothing", as in the pod
  videos), range caret reads the ground distance (authentic :5639), no
  damage;
- else (sky) -> no target, and the weapon's own double 0x388 gate
  refuses the discharge.

Binary evidence for non-mech targets: HudSimulation :5620 explicitly
handles a target WITHOUT damage zones (target->0x120 == 0) -- dead code
if only mechs were ever targeted. The pick is automatic every frame
(0x388: 11 reads / 0 direct stores in CODE).

Implementation: gBTTerrainEntity captured in MakeEntityRenderables
(Terrain::GetClassDerivations); mech4 pick = enemy PickRayHit else
ground ray -> terrain entity + ground point; damage/hotbox/lock only
for the mech pick; the task-40 enemy auto-converge REMOVED (facing away
now fires at the scenery, not magically at the enemy -- the user's
complaint). Verified all three states headless (BT_AIM 0,0 / .6,.5 /
0,-.8): aimed zone hits / terrain beams + 0 damage / no discharge.

Fourth (and evidence-complete) targeting model iteration; KB updated.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

game/reconstructed/projweap.cpp

@@ -620,13 +620,18 @@ void
 	// reconstruction; the byte-exact world-entity Projectile is blocked by the 2007 engine
 	// Entity base mismatch -- see BTPushProjectile / mech4.cpp).  Speed = |launchVelocity|.
 	char *o = (char *)owner;							// inherited MechSubsystem::owner (the Mech)
-	void *target = (o != 0) ? *(void **)(o + 0x388) : 0;			// owner's locked target entity (null in bring-up)
-	Point3D targetPos = (o != 0) ? *(Point3D *)(o + 0x37c) : muzzle;	// owner target point
+	// The owner's target slots (raw 0x388/0x37c -- the same raw offsets mech4's
+	// targeting block writes; a consistent producer/consumer pair on our
+	// compiled object).  Task #41: the slots hold the WORLD PICK -- the enemy
+	// mech under the boresight, or the terrain downrange (a missile fired at
+	// the scenery flies to the ground point and detonates without damage), or
+	// null at the sky (BTPushProjectile refuses; the weapon's own 0x388 gate
+	// wouldn't have fired either).
+	void *target = (o != 0) ? *(void **)(o + 0x388) : 0;
+	Point3D targetPos = (o != 0) ? *(Point3D *)(o + 0x37c) : muzzle;
 	Scalar  speed = (Scalar)sqrtf(launchVelocity.x*launchVelocity.x
 								+ launchVelocity.y*launchVelocity.y
 								+ launchVelocity.z*launchVelocity.z);
-	// Always launch -- BTPushProjectile falls back to gEnemyMech when the owner's target
-	// slot isn't populated (bring-up).
 	BTPushProjectile(muzzle, o, target, targetPos, speed, damageData.damageAmount);
 
 	simulationFlags |= 0x1;								// replication-dirty