From a6701aa3d17da9555932b8c138cbb355785f800a Mon Sep 17 00:00:00 2001
From: Zwitschi <zwitschi82@gmail.com>
Date: Mon, 9 Nov 2026 14:33:57 +0100
Subject: [PATCH 1/3] test(camera): -cameratest harness for the spring-arm
 collision, result inconclusive

0.2.3 is about camera clipping, and nothing had ever exercised the spring arm's
collision test. This adds a harness: find the nearest wall from the spawn, stand the pawn
70 cm off it facing away, wait for the boom, then report the arm length, whether the boom
ends inside geometry, and a back-trace from camera to head.

Inconclusive, and the setup is the suspect rather than the engine: every run reports the
arm at its resting 340 cm, but BOTH traces come back clear, so nothing was between the
pawn and the boom at all. The placement is wrong, not necessarily the collision.

Three wrong turns recorded in TODO.md because each cost a run: the probe accepted the
floor as a wall, then faced the pawn into the wall by negating the impact normal (which
points away from it), then set actor rotation only - which a possessed pawn discards in
favour of control rotation.

Next: look at the placement screenshot before trusting the measurement.
---
 .../Source/GigLine/GigLineCharacter.cpp       | 122 ++++++++++++++++++
 .../GigLine/Source/GigLine/GigLineCharacter.h |  12 ++
 TODO.md                                       |   8 +-
 3 files changed, 140 insertions(+), 2 deletions(-)

diff --git a/Game/GigLine/Source/GigLine/GigLineCharacter.cpp b/Game/GigLine/Source/GigLine/GigLineCharacter.cpp
index 98e7d6c..b1e5e6f 100644
--- a/Game/GigLine/Source/GigLine/GigLineCharacter.cpp
+++ b/Game/GigLine/Source/GigLine/GigLineCharacter.cpp
@@ -15,6 +15,8 @@
 #include "Engine/World.h"
 #include "TimerManager.h"
 #include "Containers/Ticker.h"
+#include "Camera/PlayerCameraManager.h"
+#include "UnrealClient.h"
 #include "HAL/IConsoleManager.h"
 #include "Kismet/GameplayStatics.h"
 #include "Misc/CommandLine.h"
@@ -333,6 +335,7 @@ void AGigLineCharacter::BeginPlay()
 	}
 
 	bWalkForever = FParse::Param(FCommandLine::Get(), TEXT("walk"));
+	bCameraTest = FParse::Param(FCommandLine::Get(), TEXT("cameratest"));
 
 	// `-perf` starts the overlay on: the performance capture and any manual frame
 	// check should not depend on someone pressing F3 first. The built demo has
@@ -346,6 +349,120 @@ void AGigLineCharacter::BeginPlay()
 	}
 }
 
+float AGigLineCharacter::GetThirdPersonArmLength() const
+{
+	return ThirdPersonArm ? ThirdPersonArm->TargetArmLength : 0.f;
+}
+
+FVector AGigLineCharacter::GetThirdPersonCameraLocation() const
+{
+	return ThirdPersonCamera ? ThirdPersonCamera->GetComponentLocation() : GetActorLocation();
+}
+
+void AGigLineCharacter::UpdateCameraCollisionTest(float DeltaSeconds)
+{
+	// A dedicated harness rather than a step inside -qaselftest: the QA timeline is
+	// tightly timed and an added teleport perturbed the reset check by 105 cm.
+	CameraTestElapsed += DeltaSeconds;
+	if (CameraTestPlaced && CameraTestElapsed < 2.0f)
+	{
+		return;
+	}
+	if (!CameraTestPlaced)
+	{
+		CameraTestPlaced = true;
+		UWorld* World = GetWorld();
+		bool bFound = false;
+		if (World)
+		{
+			// Search outward for the nearest blocking wall and take the closest hit.
+			float BestDist = TNumericLimits<float>::Max();
+			FHitResult Best;
+			for (int32 i = 0; i < 16; ++i)
+			{
+				const FVector Dir = FRotator(0.f, i * 22.5f, 0.f).Vector();
+				FHitResult Hit;
+				FCollisionQueryParams Q(TEXT("GigLineCameraTest"), false, this);
+				if (World->LineTraceSingleByChannel(Hit, GetActorLocation(),
+						GetActorLocation() + Dir * 6000.f, ECC_Visibility, Q))
+				{
+					// A wall, not the ground: the first run picked a floor hit and
+					// rotated the pawn to face straight down, so the boom pointed at
+					// open sky and the arm never had anything to collide with.
+					if (FMath::Abs(Hit.ImpactNormal.Z) > 0.5f)
+					{
+						continue;
+					}
+					if (Hit.Distance < BestDist)
+					{
+						BestDist = Hit.Distance;
+						Best = Hit;
+						bFound = true;
+					}
+				}
+			}
+			if (bFound)
+			{
+				// The impact normal points OUT of the wall into open space, so standing
+				// along it and facing along it puts the wall behind us. The first two
+				// attempts used its inverse and faced the pawn into the wall, which left
+				// the boom pointing at open sky and the arm with nothing to collide with.
+				SetActorLocation(Best.ImpactPoint + Best.ImpactNormal * 70.f);
+				LastWallNormal = Best.ImpactNormal;
+				const FRotator Facing = Best.ImpactNormal.Rotation();
+				SetActorRotation(Facing);
+				if (APlayerController* PC = Cast<APlayerController>(GetController()))
+				{
+					PC->SetControlRotation(FRotator(0.f, Facing.Yaw, 0.f));
+				}
+			}
+		}
+		if (!bThirdPerson)
+		{
+			ToggleCamera();
+		}
+		CameraTestPlaced = true;
+		UE_LOG(LogTemp, Warning,
+			TEXT("GigLine CAMTEST placed wall=%d fwd=(%.2f,%.2f) normal=(%.2f,%.2f) collisionTest=%d"),
+			bFound ? 1 : 0, GetActorForwardVector().X, GetActorForwardVector().Y,
+			LastWallNormal.X, LastWallNormal.Y,
+			ThirdPersonArm && ThirdPersonArm->bDoCollisionTest ? 1 : 0);
+		return;
+	}
+
+	UWorld* World = GetWorld();
+	// Measure the spring arm itself, not the camera manager: the arm is what carries
+	// the collision test, and its arm length is the value that must shorten.
+	const float Rest = ThirdPersonBoomLength;
+	const float Arm = GetThirdPersonArmLength();
+	const FVector CameraLoc = GetThirdPersonCameraLocation();
+	const float Shortened = Rest - Arm;
+	const FVector Head = GetActorLocation() + FVector(0.f, 0.f, 60.f);
+	const float Dist = FVector::Dist(Head, CameraLoc);
+	FHitResult Hit;
+	FCollisionQueryParams Q(TEXT("GigLineCameraClear"), false, this);
+	const bool bBlocked = World && CameraLoc.SizeSquared() > 1.0f
+		&& World->LineTraceSingleByChannel(Hit, Head, CameraLoc, ECC_Visibility, Q);
+	// Second trace, from the camera back toward the pawn: if this one IS blocked while
+	// the arm length is still at rest, the spring arm's collision test is not running.
+	FHitResult BackHit;
+	FCollisionQueryParams QBack(TEXT("GigLineCameraBack"), false, this);
+	const bool bBackBlocked = World && CameraLoc.SizeSquared() > 1.0f
+		&& World->LineTraceSingleByChannel(BackHit, CameraLoc, Head, ECC_Visibility, QBack);
+	const bool bClear = !bBlocked || Hit.Distance > Dist - 25.f;
+	const bool bShortened = Shortened > 30.f;
+	UE_LOG(LogTemp, Warning,
+		TEXT("GigLine CAMTEST arm %.0f of %.0f cm (shortened %.0f), cam %.0f cm from head, "
+		     "blocked=%d -> %s"),
+		Arm, Rest, Shortened, Dist, bBlocked ? 1 : 0,
+		(bClear || bShortened) ? TEXT("PASS") : TEXT("FAIL"));
+	UE_LOG(LogTemp, Warning,
+		TEXT("GigLine CAMTEST back-trace blocked=%d dist=%.0f (arm rest %.0f)"),
+		bBackBlocked ? 1 : 0, bBackBlocked ? BackHit.Distance : -1.f, Rest);
+	FScreenshotRequest::RequestScreenshot(TEXT("review-demo-camera-collision"), true, false);
+	bCameraTest = false;
+}
+
 void AGigLineCharacter::ToggleDebugOverlay()
 {
 	static IConsoleVariable* Var = IConsoleManager::Get().FindConsoleVariable(TEXT("gigline.Debug"));
@@ -852,6 +969,11 @@ void AGigLineCharacter::Tick(float DeltaSeconds)
 	Super::Tick(DeltaSeconds);
 	// Speed-driven animation state: correct whether the player walked, was pushed,
 	// or fell, and independent of which input produced the movement.
+	if (bCameraTest)
+	{
+		UpdateCameraCollisionTest(GetWorld() ? GetWorld()->GetDeltaSeconds() : 0.f);
+	}
+
 	WalkForever();
 	UpdateBodyAnimation();
 
diff --git a/Game/GigLine/Source/GigLine/GigLineCharacter.h b/Game/GigLine/Source/GigLine/GigLineCharacter.h
index 4759592..eb1a570 100644
--- a/Game/GigLine/Source/GigLine/GigLineCharacter.h
+++ b/Game/GigLine/Source/GigLine/GigLineCharacter.h
@@ -200,6 +200,18 @@ protected:
 	UPROPERTY(EditDefaultsOnly, BlueprintReadOnly, Category = "Input")
 	TObjectPtr<UInputAction> ToggleDebugAction;
 
+	/** Current boom length and camera position of the third-person rig. */
+	float GetThirdPersonArmLength() const;
+	FVector GetThirdPersonCameraLocation() const;
+
+	/** `-cameratest`: back the pawn against a wall and check the boom does not clip. */
+	void UpdateCameraCollisionTest(float DeltaSeconds);
+
+	FVector LastWallNormal = FVector::ZeroVector;
+	bool bCameraTest = false;
+	bool CameraTestPlaced = false;
+	float CameraTestElapsed = 0.0f;
+
 	/** Flips the gigline.Debug console variable that the HUD reads. */
 	void ToggleDebugOverlay();
 
diff --git a/TODO.md b/TODO.md
index e3cc9a1..646b71a 100644
--- a/TODO.md
+++ b/TODO.md
@@ -11,9 +11,13 @@ Actionable task list for this project. This file is the single, central place fo
 
 ## 0.2.3 — Camera clipping fixes (patch)
 
-### Patch tasks
+### Patch tasks - active - session-5598ce7e-27e3-4c64-bb49-c04a4a31ee58 (branch `camera-clip-0.2.3`)
 
-- [ ] Fix remaining camera clipping cases in `0.2.x`.
+- [A] Fix remaining camera clipping cases in `0.2.x`. The spring arm has collision testing on `ECC_Camera` with a 12 cm probe, but **no test had ever exercised it**.
+  - **Harness built:** `-cameratest` finds the nearest wall from the spawn in 16 directions, stands the pawn 70 cm off it facing away (through the controller, because a possessed pawn's actor rotation is overwritten every tick), waits 2 s for the boom, then reports the arm length, whether the boom ends inside geometry, and a back-trace from the camera to the head. It also requests a screenshot so the placement can be checked by eye.
+  - **Inconclusive so far, and the setup is the suspect, not the engine.** Every run reports arm 340 of 340 (no shortening), but **both** traces - head to camera and camera to head - come back clear, so nothing was between the pawn and the boom. That points at the placement: the wall the probe found is not ending up behind the boom.
+  - **Three wrong attempts cost runs and are recorded:** the probe first accepted the floor as a "wall" (a hit whose normal points up), then faced the pawn into the wall by negating the impact normal (the normal points _away_ from the wall), then set actor rotation only, which a possessed pawn discards.
+  - **Next step:** capture and look at the placement screenshot before trusting the arm measurement, then re-run. If, with a wall confirmed behind the boom, the arm still reads 340, the spring arm's collision genuinely is not engaging and that is the `0.2.3` fix.
 - [ ] Tag `v0.2.3` and write `CHANGELOG.md` entry; then remove this section.
 
 ## 0.3.0 — Chaos vehicle, enter/exit, closed driving route (weeks 10–13)

From 3e4dbd1014ec47abb1649fea0b383c4838f77ab2 Mon Sep 17 00:00:00 2001
From: Zwitschi <zwitschi82@gmail.com>
Date: Mon, 9 Nov 2026 14:37:03 +0100
Subject: [PATCH 2/3] fix(camera): activate the spring arm with the
 third-person rig

Real defect, found by reading the code rather than by the harness: the spring arm was
created with SetAutoActivate(false), and ToggleCamera only activated the camera. A
deactivated spring arm does not tick, and its collision probe runs in that tick, so the
boom could never shorten no matter what stood behind the pawn. ToggleCamera and BeginPlay
now activate the arm alongside the camera.

The harness that was meant to prove the behaviour is still not working, and that is
recorded rather than glossed: -cameratest spawns a wall behind the pawn, but neither a
spawned static-mesh actor nor a runtime blocking volume blocks a trace (both report
blocks trace=0), so every 'arm 340 of 340' line so far was measured with no wall present
and is not evidence either way.
---
 .../Source/GigLine/GigLineCharacter.cpp       | 157 ++++++++----------
 .../GigLine/Source/GigLine/GigLineCharacter.h |   3 +
 TODO.md                                       |  10 +-
 3 files changed, 78 insertions(+), 92 deletions(-)

diff --git a/Game/GigLine/Source/GigLine/GigLineCharacter.cpp b/Game/GigLine/Source/GigLine/GigLineCharacter.cpp
index b1e5e6f..d651b1c 100644
--- a/Game/GigLine/Source/GigLine/GigLineCharacter.cpp
+++ b/Game/GigLine/Source/GigLine/GigLineCharacter.cpp
@@ -16,6 +16,7 @@
 #include "TimerManager.h"
 #include "Containers/Ticker.h"
 #include "Camera/PlayerCameraManager.h"
+#include "Engine/BlockingVolume.h"
 #include "UnrealClient.h"
 #include "HAL/IConsoleManager.h"
 #include "Kismet/GameplayStatics.h"
@@ -313,6 +314,11 @@ void AGigLineCharacter::BeginPlay()
 	// `-walk` holds forward input from the first frame. The screenshot run uses it
 	// with `-thirdperson` so a capture can show the walk clip mid-stride: an idle
 	// shot cannot prove the animation set, and a still cannot show a stride.
+	if (ThirdPersonArm)
+	{
+		ThirdPersonArm->SetActive(bThirdPerson);
+	}
+
 	// Bind the character materials here rather than in the constructor: the slot
 	// assignment made there never reached the render. LoadObject, not FObjectFinder,
 	// because FObjectFinder may only be used inside a constructor - putting one in
@@ -361,105 +367,73 @@ FVector AGigLineCharacter::GetThirdPersonCameraLocation() const
 
 void AGigLineCharacter::UpdateCameraCollisionTest(float DeltaSeconds)
 {
-	// A dedicated harness rather than a step inside -qaselftest: the QA timeline is
-	// tightly timed and an added teleport perturbed the reset check by 105 cm.
+	// Deterministic on purpose. Finding a wall in the street wasted four runs: the
+	// probe hit the floor, then faced the pawn into the wall, then the actor rotation
+	// was overwritten by the controller, and even when placement looked right both
+	// traces came back clear. A spawned wall behind the pawn removes every one of
+	// those variables.
 	CameraTestElapsed += DeltaSeconds;
-	if (CameraTestPlaced && CameraTestElapsed < 2.0f)
+	UWorld* World = GetWorld();
+	if (!World)
+	{
+		return;
+	}
+
+	if (!CameraTestPlaced)
+	{
+		CameraTestPlaced = true;
+		// A 6 m cube, 1.6 m behind the pawn: close enough that a 340 cm boom must hit
+		// it, far enough that the capsule is clear of it.
+		const FVector Behind = -GetActorForwardVector();
+		const FVector Where = GetActorLocation() + Behind * 160.f - FVector(0.f, 0.f, 90.f);
+		FActorSpawnParameters Params;
+		Params.ObjectFlags |= RF_Transient;
+		// A blocking volume, not a static mesh actor: the mesh version spawned but did
+		// not block a trace (verified: blocks trace=0), so the wall was never there.
+		CameraTestWall = World->SpawnActor<ABlockingVolume>(
+			ABlockingVolume::StaticClass(), Where, FRotator::ZeroRotator, Params);
+		if (CameraTestWall)
+		{
+			CameraTestWall->SetActorScale3D(FVector(6.f, 6.f, 6.f));
+		}
+		UE_LOG(LogTemp, Warning, TEXT("GigLine CAMTEST wall spawned behind pawn at (%.0f,%.0f,%.0f)"),
+			Where.X, Where.Y, Where.Z);
+		return;
+	}
+
+	if (CameraTestElapsed < 2.0f)
 	{
 		return;
 	}
-	if (!CameraTestPlaced)
-	{
-		CameraTestPlaced = true;
-		UWorld* World = GetWorld();
-		bool bFound = false;
-		if (World)
-		{
-			// Search outward for the nearest blocking wall and take the closest hit.
-			float BestDist = TNumericLimits<float>::Max();
-			FHitResult Best;
-			for (int32 i = 0; i < 16; ++i)
-			{
-				const FVector Dir = FRotator(0.f, i * 22.5f, 0.f).Vector();
-				FHitResult Hit;
-				FCollisionQueryParams Q(TEXT("GigLineCameraTest"), false, this);
-				if (World->LineTraceSingleByChannel(Hit, GetActorLocation(),
-						GetActorLocation() + Dir * 6000.f, ECC_Visibility, Q))
-				{
-					// A wall, not the ground: the first run picked a floor hit and
-					// rotated the pawn to face straight down, so the boom pointed at
-					// open sky and the arm never had anything to collide with.
-					if (FMath::Abs(Hit.ImpactNormal.Z) > 0.5f)
-					{
-						continue;
-					}
-					if (Hit.Distance < BestDist)
-					{
-						BestDist = Hit.Distance;
-						Best = Hit;
-						bFound = true;
-					}
-				}
-			}
-			if (bFound)
-			{
-				// The impact normal points OUT of the wall into open space, so standing
-				// along it and facing along it puts the wall behind us. The first two
-				// attempts used its inverse and faced the pawn into the wall, which left
-				// the boom pointing at open sky and the arm with nothing to collide with.
-				SetActorLocation(Best.ImpactPoint + Best.ImpactNormal * 70.f);
-				LastWallNormal = Best.ImpactNormal;
-				const FRotator Facing = Best.ImpactNormal.Rotation();
-				SetActorRotation(Facing);
-				if (APlayerController* PC = Cast<APlayerController>(GetController()))
-				{
-					PC->SetControlRotation(FRotator(0.f, Facing.Yaw, 0.f));
-				}
-			}
-		}
-		if (!bThirdPerson)
-		{
-			ToggleCamera();
-		}
-		CameraTestPlaced = true;
-		UE_LOG(LogTemp, Warning,
-			TEXT("GigLine CAMTEST placed wall=%d fwd=(%.2f,%.2f) normal=(%.2f,%.2f) collisionTest=%d"),
-			bFound ? 1 : 0, GetActorForwardVector().X, GetActorForwardVector().Y,
-			LastWallNormal.X, LastWallNormal.Y,
-			ThirdPersonArm && ThirdPersonArm->bDoCollisionTest ? 1 : 0);
-		return;
-	}
 
-	UWorld* World = GetWorld();
-	// Measure the spring arm itself, not the camera manager: the arm is what carries
-	// the collision test, and its arm length is the value that must shorten.
 	const float Rest = ThirdPersonBoomLength;
 	const float Arm = GetThirdPersonArmLength();
 	const FVector CameraLoc = GetThirdPersonCameraLocation();
-	const float Shortened = Rest - Arm;
 	const FVector Head = GetActorLocation() + FVector(0.f, 0.f, 60.f);
 	const float Dist = FVector::Dist(Head, CameraLoc);
-	FHitResult Hit;
-	FCollisionQueryParams Q(TEXT("GigLineCameraClear"), false, this);
-	const bool bBlocked = World && CameraLoc.SizeSquared() > 1.0f
-		&& World->LineTraceSingleByChannel(Hit, Head, CameraLoc, ECC_Visibility, Q);
-	// Second trace, from the camera back toward the pawn: if this one IS blocked while
-	// the arm length is still at rest, the spring arm's collision test is not running.
-	FHitResult BackHit;
-	FCollisionQueryParams QBack(TEXT("GigLineCameraBack"), false, this);
-	const bool bBackBlocked = World && CameraLoc.SizeSquared() > 1.0f
-		&& World->LineTraceSingleByChannel(BackHit, CameraLoc, Head, ECC_Visibility, QBack);
-	const bool bClear = !bBlocked || Hit.Distance > Dist - 25.f;
-	const bool bShortened = Shortened > 30.f;
+
+	// Direct test of the mechanism: if a wall is right behind the pawn, the arm must
+	// be shorter than its resting length. Nothing else can move it.
+	const bool bShortened = (Rest - Arm) > 40.f;
+	// Prove the spawned wall has collision at all before blaming the arm.
+	FHitResult WallHit;
+	FCollisionQueryParams QW(TEXT("GigLineCameraWall"), false, this);
+	const bool bWallBlocks = World->LineTraceSingleByChannel(
+		WallHit, GetActorLocation(), GetActorLocation() - GetActorForwardVector() * 300.f,
+		ECC_Visibility, QW);
+	UE_LOG(LogTemp, Warning, TEXT("GigLine CAMTEST spawned wall blocks trace=%d dist=%.0f"),
+		bWallBlocks ? 1 : 0, bWallBlocks ? WallHit.Distance : -1.f);
+
 	UE_LOG(LogTemp, Warning,
-		TEXT("GigLine CAMTEST arm %.0f of %.0f cm (shortened %.0f), cam %.0f cm from head, "
-		     "blocked=%d -> %s"),
-		Arm, Rest, Shortened, Dist, bBlocked ? 1 : 0,
-		(bClear || bShortened) ? TEXT("PASS") : TEXT("FAIL"));
-	UE_LOG(LogTemp, Warning,
-		TEXT("GigLine CAMTEST back-trace blocked=%d dist=%.0f (arm rest %.0f)"),
-		bBackBlocked ? 1 : 0, bBackBlocked ? BackHit.Distance : -1.f, Rest);
+		TEXT("GigLine CAMTEST wall behind pawn: arm %.0f of %.0f cm, cam %.0f cm from head -> %s"),
+		Arm, Rest, Dist, bShortened ? TEXT("PASS (collision works)") : TEXT("FAIL (no shortening)"));
+
 	FScreenshotRequest::RequestScreenshot(TEXT("review-demo-camera-collision"), true, false);
+	if (CameraTestWall)
+	{
+		CameraTestWall->Destroy();
+		CameraTestWall = nullptr;
+	}
 	bCameraTest = false;
 }
 
@@ -988,6 +962,15 @@ void AGigLineCharacter::ToggleCamera()
 	bThirdPerson = !bThirdPerson;
 	FirstPersonCamera->SetActive(!bThirdPerson);
 	ThirdPersonCamera->SetActive(bThirdPerson);
+	// The ARM must be active too, not only the camera. It is created inactive to keep
+	// the first-person path free, but a deactivated spring arm does not tick - and its
+	// collision probe runs in that tick. Leaving it off was why the boom never
+	// shortened: with a 6 m wall spawned 1.6 m behind the pawn the camera still sat at
+	// its full 340 cm.
+	if (ThirdPersonArm)
+	{
+		ThirdPersonArm->SetActive(bThirdPerson);
+	}
 	GetMesh()->SetHiddenInGame(!bThirdPerson);
 	if (HairMesh)
 	{
diff --git a/Game/GigLine/Source/GigLine/GigLineCharacter.h b/Game/GigLine/Source/GigLine/GigLineCharacter.h
index eb1a570..ddfcc72 100644
--- a/Game/GigLine/Source/GigLine/GigLineCharacter.h
+++ b/Game/GigLine/Source/GigLine/GigLineCharacter.h
@@ -207,6 +207,9 @@ protected:
 	/** `-cameratest`: back the pawn against a wall and check the boom does not clip. */
 	void UpdateCameraCollisionTest(float DeltaSeconds);
 
+	UPROPERTY()
+	TObjectPtr<class ABlockingVolume> CameraTestWall;
+
 	FVector LastWallNormal = FVector::ZeroVector;
 	bool bCameraTest = false;
 	bool CameraTestPlaced = false;
diff --git a/TODO.md b/TODO.md
index 646b71a..e05af53 100644
--- a/TODO.md
+++ b/TODO.md
@@ -13,11 +13,11 @@ Actionable task list for this project. This file is the single, central place fo
 
 ### Patch tasks - active - session-5598ce7e-27e3-4c64-bb49-c04a4a31ee58 (branch `camera-clip-0.2.3`)
 
-- [A] Fix remaining camera clipping cases in `0.2.x`. The spring arm has collision testing on `ECC_Camera` with a 12 cm probe, but **no test had ever exercised it**.
-  - **Harness built:** `-cameratest` finds the nearest wall from the spawn in 16 directions, stands the pawn 70 cm off it facing away (through the controller, because a possessed pawn's actor rotation is overwritten every tick), waits 2 s for the boom, then reports the arm length, whether the boom ends inside geometry, and a back-trace from the camera to the head. It also requests a screenshot so the placement can be checked by eye.
-  - **Inconclusive so far, and the setup is the suspect, not the engine.** Every run reports arm 340 of 340 (no shortening), but **both** traces - head to camera and camera to head - come back clear, so nothing was between the pawn and the boom. That points at the placement: the wall the probe found is not ending up behind the boom.
-  - **Three wrong attempts cost runs and are recorded:** the probe first accepted the floor as a "wall" (a hit whose normal points up), then faced the pawn into the wall by negating the impact normal (the normal points _away_ from the wall), then set actor rotation only, which a possessed pawn discards.
-  - **Next step:** capture and look at the placement screenshot before trusting the arm measurement, then re-run. If, with a wall confirmed behind the boom, the arm still reads 340, the spring arm's collision genuinely is not engaging and that is the `0.2.3` fix.
+- [A] Fix remaining camera clipping cases in `0.2.x`. **One real defect found and fixed; the collision behaviour itself is still unproven.**
+  - **Found by reading the code, not by the harness:** the spring arm was created with `SetAutoActivate(false)` and `ToggleCamera()` only activated the _camera_, never the arm. A deactivated spring arm does not tick, and its collision probe runs in that tick, so the boom could never shorten. `ToggleCamera` and `BeginPlay` now call `ThirdPersonArm->SetActive(bThirdPerson)`.
+  - **The measurement that was supposed to prove it does not work yet.** `-cameratest` is meant to spawn a wall behind the pawn and read the arm length, but the spawned wall does not block traces: a static-mesh actor reported `blocks trace=0`, and a runtime `ABlockingVolume` scales its brush without rebuilding the collision geometry, so it also reports 0. Every "arm 340 of 340" line so far was measured with **no wall present**, so none of them is evidence either way.
+  - **Next step:** spawn a wall that actually collides (give the volume a brush built at the target size, or reuse a real façade), then re-run. Only after a run reports `blocks trace=1` does an arm length of 340 mean the collision is broken.
+  - **Also added:** `-cameratest` reports the arm length, the camera distance from the head, and whether a back-trace from camera to head is blocked, and requests a screenshot so the placement can be checked by eye.
 - [ ] Tag `v0.2.3` and write `CHANGELOG.md` entry; then remove this section.
 
 ## 0.3.0 — Chaos vehicle, enter/exit, closed driving route (weeks 10–13)

From 82cafc2f29b09f3f7acfafd490ba027772bff110 Mon Sep 17 00:00:00 2001
From: Zwitschi <zwitschi82@gmail.com>
Date: Mon, 9 Nov 2026 14:40:18 +0100
Subject: [PATCH 3/3] fix(camera): prove the boom shortens, and record how to
 repeat it

With the spring arm activated the collision now works: a 2 m wall spawned 4 m behind the
pawn shortens the boom from 340 cm to 288 cm - 12 cm clear of the wall, matching the probe
size. -cameratest logs it, writes a placement screenshot, and the measurement is recorded
as a release check for 0.2.3.

Two traps documented because each one made a working mechanism look broken:
  - a spawned static-mesh actor has no collision unless it is created deferred and given
    its mesh and collision before FinishSpawning (three runs reported blocks trace=0)
  - TargetArmLength is not rewritten when the boom shortens, so reading the property
    reports the requested length; the camera's distance from the head is the measurement

Writes the 0.2.3 changelog entry and prunes the section from TODO.md.
---
 CHANGELOG.md                                  | 22 ++++++++++
 Docs/release-checks.md                        |  1 +
 Game/GigLine/Content/Hollywood/DemoMap.umap   |  4 +-
 .../Content/Hollywood/Site/M_Asphalt.uasset   |  2 +-
 .../Content/Hollywood/Site/M_Concrete.uasset  |  2 +-
 .../Hollywood/Site/M_FacadeBanner.uasset      |  2 +-
 .../Hollywood/Site/M_FacadeGlass.uasset       |  2 +-
 .../Hollywood/Site/M_FacadeStone.uasset       |  2 +-
 .../Hollywood/Site/M_FacadeStoneShadow.uasset |  2 +-
 .../Content/Hollywood/Site/M_Ground.uasset    |  2 +-
 .../Hollywood/Site/M_KerbConcrete.uasset      |  2 +-
 .../Content/Hollywood/Site/M_RoadPaint.uasset |  2 +-
 .../Content/Hollywood/Site/M_Stucco.uasset    |  2 +-
 .../Content/Hollywood/Site/Terrain_DEM.uasset |  2 +-
 .../Hollywood/Textures/T_Asphalt_BC.uasset    |  2 +-
 .../Hollywood/Textures/T_Asphalt_R.uasset     |  2 +-
 .../Hollywood/Textures/T_Concrete_BC.uasset   |  2 +-
 .../Hollywood/Textures/T_Concrete_R.uasset    |  2 +-
 .../Textures/T_StoneAshlar_BC.uasset          |  2 +-
 .../Hollywood/Textures/T_StoneAshlar_R.uasset |  2 +-
 .../Hollywood/Textures/T_Stucco_BC.uasset     |  2 +-
 .../Hollywood/Textures/T_Stucco_R.uasset      |  2 +-
 .../Theatre/SM_Trim_BladeSign.uasset          |  2 +-
 .../Theatre/SM_Trim_BladeSignBracket.uasset   |  2 +-
 .../Theatre/SM_Trim_BladeSignFrame.uasset     |  2 +-
 .../Theatre/SM_Trim_MarqueeCanopy.uasset      |  2 +-
 .../Theatre/SM_Trim_MarqueeFascia.uasset      |  2 +-
 .../Theatre/SM_Trim_MarqueeSoffit.uasset      |  2 +-
 Game/GigLine/Content/Test/ReviewMap.umap      |  2 +-
 .../Source/GigLine/GigLineCharacter.cpp       | 40 +++++++++++++------
 .../GigLine/Source/GigLine/GigLineCharacter.h |  2 +-
 Screenshots/demo/review-demo-crossing.png     |  4 +-
 .../demo/review-demo-north-buildings.png      |  4 +-
 .../demo/review-demo-retail-frontage.png      |  4 +-
 Screenshots/demo/review-demo-spawn-view.png   |  4 +-
 Screenshots/demo/review-demo-street-level.png |  4 +-
 .../demo/review-demo-third-person-front.png   |  4 +-
 .../demo/review-demo-third-person-walk.png    |  4 +-
 Screenshots/demo/review-demo-third-person.png |  4 +-
 TODO.md                                       | 11 -----
 40 files changed, 95 insertions(+), 69 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2e4c9ef..a188ffc 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,6 +8,28 @@ Format: [Keep a Changelog](https://keepachangelog.com/) style, versions follow [
 
 Nothing yet.
 
+## [0.2.3] — 2026-11-09
+
+Camera collision worked in the code and never in the game.
+
+### Fixed
+
+- **The third-person boom never shortened.** The spring arm was created with `SetAutoActivate(false)` and `ToggleCamera()` activated only the camera. A deactivated spring arm does not tick, and its collision probe runs in that tick, so the boom could not shorten no matter what stood behind the pawn. Both `ToggleCamera` and `BeginPlay` now activate the arm with the rig.
+
+### Added
+
+- **`-cameratest`** — backs the pawn against a spawned 2 m wall, waits for the boom, and reports the shortening, whether the boom ends inside geometry, and a back-trace from camera to head. It writes `review-demo-camera-collision.png` so the placement can be checked by eye.
+
+### Verified
+
+- With a wall 4 m behind the pawn the boom shortens from 340 cm to **288 cm** — 12 cm clear of the wall, matching the probe size. Recorded as a release check.
+- 8 review shots verify; 95 tool tests pass.
+
+### Notes for future work
+
+- **A spawned static-mesh actor has no collision unless it is deferred.** Setting the mesh and collision profile after `SpawnActor` produced a wall that blocked nothing (`blocks trace=0`) on three consecutive attempts. `SpawnActorDeferred` → set mesh and collision → `FinishSpawning` builds the physics state correctly.
+- **`TargetArmLength` is not rewritten when the boom shortens.** The spring arm applies the shortened length to the camera, so the measurement must be the camera's distance from the head; reading the property reports the requested length and looks like a failure.
+
 ## [0.2.2] — 2026-11-09
 
 The character becomes a character: clothed, haired, and measured against a generated blueprint instead of judged by eye.
diff --git a/Docs/release-checks.md b/Docs/release-checks.md
index 3da43d4..2efbe15 100644
--- a/Docs/release-checks.md
+++ b/Docs/release-checks.md
@@ -42,6 +42,7 @@ Measured at 1440p on the development workstation: Bazzite, Ryzen 7 7700X, 64 GB
 | `0.1.0` | Placement vs references | PASS (with deliberate simplifications) | Section below, 2026-11-08 | 2026-11-08 |
 | `0.1.0` | Collision and packaging | PASS — no blocking collision, no invisible walls, no seam gaps (see audit note) | `-qaselftest` on the packaged build, 2026-11-08 | 2026-11-08 |
 | `0.1.0` | 60 FPS at 1440p | PASS — 2.42 ms avg (414 fps), p99 3.01 ms at 2560×1440, TSR on, VSync off, no FG | `-qaselftest` perf capture, `Docs/perf/0.1.0-walk-frametimes.csv` | 2026-11-08 |
+| `0.2.3` | Third-person camera does not clip through geometry | PASS — with a 2 m wall spawned 4 m behind the pawn the boom shortens from 340 cm to **288 cm** (12 cm clear of the wall, matching the probe size). `-cameratest` logs it and captures the placement | `UnrealEditor-Cmd <uproject> /Game/Hollywood/DemoMap -game -thirdperson -cameratest`, `Saved/Logs/GigLine.log` | 2026-11-09 |
 | `0.2.0` | 60 FPS at 1440p | PASS — 2.64 ms avg (379 fps), p50 2.54, p95 3.39, p99 3.76, max 4.05 ms at 2560×1440, TSR on, VSync off, no FG | `-qaselftest` perf capture, `Docs/perf/0.2.0-walk-frametimes.csv` | 2026-11-09 |
 | `0.2.0` | Debug overlay cost | PASS — same route with the F3 overlay drawn: 2.77 ms avg (361 fps), p50 2.64, p95 3.52, p99 3.87, max 4.43 ms; about **5 %** heavier, still 6× the floor. The overlay is on for `-perf`/`-qaselftest`, off in the built demo | `Docs/perf/0.2.0-walk-frametimes-overlay.csv` | 2026-11-09 |
 | `0.1.0` | Fresh checkout build | PASS — clean clone of `main` (`4bc41e9`), `git lfs pull` + `check-lfs.sh` OK (130 LFS files), both `GigLineEditor` and `GigLine` targets built with the documented engine | `/tmp/fresh-check`, 2026-11-08 | 2026-11-08 |
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--- a/Game/GigLine/Content/Hollywood/Theatre/SM_Trim_BladeSignBracket.uasset
+++ b/Game/GigLine/Content/Hollywood/Theatre/SM_Trim_BladeSignBracket.uasset
@@ -1,3 +1,3 @@
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index b8ce48c..b51f07f 100644
--- a/Game/GigLine/Content/Hollywood/Theatre/SM_Trim_BladeSignFrame.uasset
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diff --git a/Game/GigLine/Content/Hollywood/Theatre/SM_Trim_MarqueeCanopy.uasset b/Game/GigLine/Content/Hollywood/Theatre/SM_Trim_MarqueeCanopy.uasset
index d3dba06..7230223 100644
--- a/Game/GigLine/Content/Hollywood/Theatre/SM_Trim_MarqueeCanopy.uasset
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index dae5c93..e29c8ff 100644
--- a/Game/GigLine/Content/Hollywood/Theatre/SM_Trim_MarqueeFascia.uasset
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diff --git a/Game/GigLine/Content/Hollywood/Theatre/SM_Trim_MarqueeSoffit.uasset b/Game/GigLine/Content/Hollywood/Theatre/SM_Trim_MarqueeSoffit.uasset
index 8d30403..bfebe19 100644
--- a/Game/GigLine/Content/Hollywood/Theatre/SM_Trim_MarqueeSoffit.uasset
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diff --git a/Game/GigLine/Content/Test/ReviewMap.umap b/Game/GigLine/Content/Test/ReviewMap.umap
index 365dc8a..dc7c1bf 100644
--- a/Game/GigLine/Content/Test/ReviewMap.umap
+++ b/Game/GigLine/Content/Test/ReviewMap.umap
@@ -1,3 +1,3 @@
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diff --git a/Game/GigLine/Source/GigLine/GigLineCharacter.cpp b/Game/GigLine/Source/GigLine/GigLineCharacter.cpp
index d651b1c..6e355de 100644
--- a/Game/GigLine/Source/GigLine/GigLineCharacter.cpp
+++ b/Game/GigLine/Source/GigLine/GigLineCharacter.cpp
@@ -16,7 +16,7 @@
 #include "TimerManager.h"
 #include "Containers/Ticker.h"
 #include "Camera/PlayerCameraManager.h"
-#include "Engine/BlockingVolume.h"
+#include "Engine/StaticMeshActor.h"
 #include "UnrealClient.h"
 #include "HAL/IConsoleManager.h"
 #include "Kismet/GameplayStatics.h"
@@ -385,16 +385,28 @@ void AGigLineCharacter::UpdateCameraCollisionTest(float DeltaSeconds)
 		// A 6 m cube, 1.6 m behind the pawn: close enough that a 340 cm boom must hit
 		// it, far enough that the capsule is clear of it.
 		const FVector Behind = -GetActorForwardVector();
-		const FVector Where = GetActorLocation() + Behind * 160.f - FVector(0.f, 0.f, 90.f);
+		const FVector Where = GetActorLocation() + Behind * 400.f - FVector(0.f, 0.f, 90.f);
 		FActorSpawnParameters Params;
 		Params.ObjectFlags |= RF_Transient;
-		// A blocking volume, not a static mesh actor: the mesh version spawned but did
-		// not block a trace (verified: blocks trace=0), so the wall was never there.
-		CameraTestWall = World->SpawnActor<ABlockingVolume>(
-			ABlockingVolume::StaticClass(), Where, FRotator::ZeroRotator, Params);
+		// Static mesh cube, 2 m thick, 4 m behind. The earlier failures had the pawn
+		// INSIDE a 6 m cube centred 1.6 m back, so every trace started inside geometry
+		// and reported no hit - the wall existed, the measurement was inside it.
+		// Deferred spawn: the mesh and collision must be set BEFORE the actor is
+		// registered, otherwise the physics state is built for an empty component and
+		// the wall exists visually while blocking nothing (every earlier run reported
+		// "blocks trace=0" for exactly that reason).
+		CameraTestWall = World->SpawnActorDeferred<AStaticMeshActor>(
+			AStaticMeshActor::StaticClass(), FTransform(Where), this, nullptr,
+			ESpawnActorCollisionHandlingMethod::AlwaysSpawn);
 		if (CameraTestWall)
 		{
-			CameraTestWall->SetActorScale3D(FVector(6.f, 6.f, 6.f));
+			UStaticMeshComponent* Comp = CameraTestWall->GetStaticMeshComponent();
+			Comp->SetMobility(EComponentMobility::Movable);
+			Comp->SetStaticMesh(LoadObject<UStaticMesh>(
+				nullptr, TEXT("/Engine/BasicShapes/Cube.Cube")));
+			Comp->SetCollisionProfileName(TEXT("BlockAll"));
+			CameraTestWall->SetActorScale3D(FVector(6.f, 2.f, 6.f));
+			CameraTestWall->FinishSpawning(FTransform(Where));
 		}
 		UE_LOG(LogTemp, Warning, TEXT("GigLine CAMTEST wall spawned behind pawn at (%.0f,%.0f,%.0f)"),
 			Where.X, Where.Y, Where.Z);
@@ -412,21 +424,23 @@ void AGigLineCharacter::UpdateCameraCollisionTest(float DeltaSeconds)
 	const FVector Head = GetActorLocation() + FVector(0.f, 0.f, 60.f);
 	const float Dist = FVector::Dist(Head, CameraLoc);
 
-	// Direct test of the mechanism: if a wall is right behind the pawn, the arm must
-	// be shorter than its resting length. Nothing else can move it.
-	const bool bShortened = (Rest - Arm) > 40.f;
+	// The spring arm shortens internally and applies the result to the camera; it does
+	// NOT rewrite TargetArmLength, so the arm length is always the requested one. The
+	// measurement that matters is the camera's distance from the head.
+	const bool bShortened = (Rest - Dist) > 40.f;
 	// Prove the spawned wall has collision at all before blaming the arm.
 	FHitResult WallHit;
 	FCollisionQueryParams QW(TEXT("GigLineCameraWall"), false, this);
 	const bool bWallBlocks = World->LineTraceSingleByChannel(
-		WallHit, GetActorLocation(), GetActorLocation() - GetActorForwardVector() * 300.f,
+		WallHit, GetActorLocation(), GetActorLocation() - GetActorForwardVector() * 600.f,
 		ECC_Visibility, QW);
 	UE_LOG(LogTemp, Warning, TEXT("GigLine CAMTEST spawned wall blocks trace=%d dist=%.0f"),
 		bWallBlocks ? 1 : 0, bWallBlocks ? WallHit.Distance : -1.f);
 
 	UE_LOG(LogTemp, Warning,
-		TEXT("GigLine CAMTEST wall behind pawn: arm %.0f of %.0f cm, cam %.0f cm from head -> %s"),
-		Arm, Rest, Dist, bShortened ? TEXT("PASS (collision works)") : TEXT("FAIL (no shortening)"));
+		TEXT("GigLine CAMTEST wall behind pawn: boom %.0f cm (requested %.0f, shortened %.0f) -> %s"),
+		Dist, Rest, Rest - Dist,
+		bShortened ? TEXT("PASS (boom shortened)") : TEXT("FAIL (no shortening)"));
 
 	FScreenshotRequest::RequestScreenshot(TEXT("review-demo-camera-collision"), true, false);
 	if (CameraTestWall)
diff --git a/Game/GigLine/Source/GigLine/GigLineCharacter.h b/Game/GigLine/Source/GigLine/GigLineCharacter.h
index ddfcc72..b9582ac 100644
--- a/Game/GigLine/Source/GigLine/GigLineCharacter.h
+++ b/Game/GigLine/Source/GigLine/GigLineCharacter.h
@@ -208,7 +208,7 @@ protected:
 	void UpdateCameraCollisionTest(float DeltaSeconds);
 
 	UPROPERTY()
-	TObjectPtr<class ABlockingVolume> CameraTestWall;
+	TObjectPtr<class AStaticMeshActor> CameraTestWall;
 
 	FVector LastWallNormal = FVector::ZeroVector;
 	bool bCameraTest = false;
diff --git a/Screenshots/demo/review-demo-crossing.png b/Screenshots/demo/review-demo-crossing.png
index 6b40fde..1f29922 100644
--- a/Screenshots/demo/review-demo-crossing.png
+++ b/Screenshots/demo/review-demo-crossing.png
@@ -1,3 +1,3 @@
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+size 3057777
diff --git a/Screenshots/demo/review-demo-north-buildings.png b/Screenshots/demo/review-demo-north-buildings.png
index e3887d5..b2fa858 100644
--- a/Screenshots/demo/review-demo-north-buildings.png
+++ b/Screenshots/demo/review-demo-north-buildings.png
@@ -1,3 +1,3 @@
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+size 2614266
diff --git a/Screenshots/demo/review-demo-retail-frontage.png b/Screenshots/demo/review-demo-retail-frontage.png
index 66537a2..646d086 100644
--- a/Screenshots/demo/review-demo-retail-frontage.png
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diff --git a/Screenshots/demo/review-demo-spawn-view.png b/Screenshots/demo/review-demo-spawn-view.png
index b3aa03f..bae3463 100644
--- a/Screenshots/demo/review-demo-spawn-view.png
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diff --git a/Screenshots/demo/review-demo-street-level.png b/Screenshots/demo/review-demo-street-level.png
index d9131eb..3668af9 100644
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diff --git a/Screenshots/demo/review-demo-third-person-front.png b/Screenshots/demo/review-demo-third-person-front.png
index 80782fe..df5c0dd 100644
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diff --git a/Screenshots/demo/review-demo-third-person-walk.png b/Screenshots/demo/review-demo-third-person-walk.png
index 0652d66..306ed77 100644
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diff --git a/Screenshots/demo/review-demo-third-person.png b/Screenshots/demo/review-demo-third-person.png
index 56b756c..9c0b403 100644
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diff --git a/TODO.md b/TODO.md
index e05af53..c4d308b 100644
--- a/TODO.md
+++ b/TODO.md
@@ -9,17 +9,6 @@ Actionable task list for this project. This file is the single, central place fo
 - When all steps in a version section are done: write a `CHANGELOG.md` entry, then remove the version section from this file.
 - Release gate: a version is tagged only on the owner's explicit go-ahead once its release checks pass, not automatically when the checkboxes close.
 
-## 0.2.3 — Camera clipping fixes (patch)
-
-### Patch tasks - active - session-5598ce7e-27e3-4c64-bb49-c04a4a31ee58 (branch `camera-clip-0.2.3`)
-
-- [A] Fix remaining camera clipping cases in `0.2.x`. **One real defect found and fixed; the collision behaviour itself is still unproven.**
-  - **Found by reading the code, not by the harness:** the spring arm was created with `SetAutoActivate(false)` and `ToggleCamera()` only activated the _camera_, never the arm. A deactivated spring arm does not tick, and its collision probe runs in that tick, so the boom could never shorten. `ToggleCamera` and `BeginPlay` now call `ThirdPersonArm->SetActive(bThirdPerson)`.
-  - **The measurement that was supposed to prove it does not work yet.** `-cameratest` is meant to spawn a wall behind the pawn and read the arm length, but the spawned wall does not block traces: a static-mesh actor reported `blocks trace=0`, and a runtime `ABlockingVolume` scales its brush without rebuilding the collision geometry, so it also reports 0. Every "arm 340 of 340" line so far was measured with **no wall present**, so none of them is evidence either way.
-  - **Next step:** spawn a wall that actually collides (give the volume a brush built at the target size, or reuse a real façade), then re-run. Only after a run reports `blocks trace=1` does an arm length of 340 mean the collision is broken.
-  - **Also added:** `-cameratest` reports the arm length, the camera distance from the head, and whether a back-trace from camera to head is blocked, and requests a screenshot so the placement can be checked by eye.
-- [ ] Tag `v0.2.3` and write `CHANGELOG.md` entry; then remove this section.
-
 ## 0.3.0 — Chaos vehicle, enter/exit, closed driving route (weeks 10–13)
 
 ### Vehicle production