Aim ray follows the torso elevation (the boresight leveling erased it)

Follow-through on the pitch fix: the view pitched but shots still flew
level (user report).  Cause: the task-#48 AIM BORESIGHT leveling in the
eye's aim-camera publish (L4VIDRND) strips ALL pitch from the pick-ray
direction -- correct for the TERRAIN body pitch it was built against, but
it also erased the pilot's deliberate R/F elevation.

Fix: mech4's per-frame eye compose publishes the torso elevation
(gBTEyeElev); the publisher re-applies it onto the LEVELED forward
(fwd = (cos e * level, sin e)) before building the basis -- terrain pitch
stays stripped, the deliberate aim survives into BTGetAimRay.  Sign
matches the pixel-calibrated view compose (+ = up).

Harness evidence: pinned-down elevation visibly pitches the chase eye
into the terrain (the ray basis moves); a full headless aimed-kill could
not be driven (the autofire gate needs a designated target and the
random spawns wedged short of the truck row) -- aim-at-truck kill needs
the human pass.  Awaiting human verification (issue #8).

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

engine/MUNGA_L4/L4VIDRND.cpp

@@ -11,6 +11,11 @@ float gBTEyeSwayX = 0.0f;	// lateral weight-shift (the walk "swagger"), same sou
 // through the jointtorso HingeRenderable in the draw traversal (see the note in
 // DPLEyeRenderable::Execute).  Kept published for diagnostics/correlation.
 float gBTEyeTwist = 0.0f;
+// The player torso's live ELEVATION aim (rad), published by mech4.cpp's HUD
+// tick.  The aim-boresight leveling below (task #48) strips the TERRAIN body
+// pitch from the pick ray -- this is the pilot's DELIBERATE pitch, re-applied
+// after the leveling so aimed shots follow the R/F (stick-Y) elevation.
+float gBTEyeElev = 0.0f;
 #pragma hdrstop
 
 #include "l4vidrnd.h"
@@ -5835,11 +5840,24 @@ void
 					if (D3DXVec3LengthSq(&fwdLevel) > 1e-6f)
 					{
 						D3DXVec3Normalize(&fwdLevel, &fwdLevel);
-						zax = D3DXVECTOR3(-fwdLevel.x, 0.0f, -fwdLevel.z);	// back = -level fwd
+						// TORSO-ELEVATION AIM (pitch-fix follow-through): the
+						// leveling above strips the TERRAIN body pitch -- but the
+						// pilot's DELIBERATE R/F elevation must survive into the
+						// pick ray, or aimed shots fire level over low targets
+						// (the "still fires over the truck" report).  Re-apply
+						// the published torso elevation about the level axis:
+						// fwd = (cos e * level, sin e).  +e = aim UP (matches
+						// the view compose's pixel-calibrated sign).
+						extern float gBTEyeElev;
+						const float ce = cosf(gBTEyeElev);
+						const float se = sinf(gBTEyeElev);
+						D3DXVECTOR3 fwdAim(fwdLevel.x * ce, se, fwdLevel.z * ce);
+						D3DXVec3Normalize(&fwdAim, &fwdAim);
+						zax = D3DXVECTOR3(-fwdAim.x, -fwdAim.y, -fwdAim.z);	// back = -aimed fwd
 						D3DXVECTOR3 wup(0.0f, 1.0f, 0.0f);
 						D3DXVec3Cross(&xax, &wup, &zax);
 						D3DXVec3Normalize(&xax, &xax);
-						D3DXVec3Cross(&yax, &zax, &xax);					// == world +Y
+						D3DXVec3Cross(&yax, &zax, &xax);
 					}
 					else
 					{

game/reconstructed/mech4.cpp

@@ -4966,6 +4966,12 @@ void
 					Radian(Radian::Normalize(gBTLookPitch + elev)),
 					Radian(Radian::Normalize(gBTLookYaw)),
 					Radian(0.0f));
+				// ...and the AIM RAY: the boresight publisher (L4VIDRND task
+				// #48) LEVELS the view direction (drops terrain body pitch) --
+				// publish the deliberate elevation so it re-applies onto the
+				// leveled boresight (else shots fire level over low targets).
+				extern float gBTEyeElev;
+				gBTEyeElev = elev;
 			}
 		}