Game/GigLine/Source/GigLine/GigLineVehicle.cpp

@@ -339,6 +339,26 @@ void AGigLineVehicle::Tick(float DeltaSeconds)
 		}
 	}
 
+	// Is the body actually dynamic? A kinematic body is teleported by whoever holds it and reports
+	// no velocity - exactly the profile measured - so this decides the next step.
+	{
+		static bool bDynamicsChecked = false;
+		if (!bDynamicsChecked && SettleElapsed > 0.2f)
+		{
+			bDynamicsChecked = true;
+			if (USkeletalMeshComponent* Body = GetMesh())
+			{
+				FBodyInstance* Instance = Body->GetBodyInstance();
+				UE_LOG(LogTemp, Warning,
+					TEXT("GigLine vehicle dynamic: simulate=%d instance=%s profile=%s"),
+					Body->IsSimulatingPhysics() ? 1 : 0,
+					Instance ? TEXT("yes") : TEXT("no"),
+					Body->GetCollisionProfileName().IsNone()
+						? TEXT("none") : *Body->GetCollisionProfileName().ToString());
+			}
+		}
+	}
+
 	// Velocity profile: an impulse shows as a spike at t=0, a force as steady growth.
 	{
 		static float NextSample = 0.0f;

TODO.md

@@ -50,6 +50,12 @@ So the wheel bones match, the terrain has no proxy lid, and stopping the mover d
 2. **`UChaosWheeledVehicleMovementComponent::UpdateState` / `OnUpdateTransform`** writing the transform from a vehicle state that was never created (which is also why `CreateVehicle()` yields no wheels).
 3. **The skeletal mesh asset itself** - `SK_Vehicle_Sedan` came from our own FBX pipeline; if its bone layout does not match what the wheel setups name, `CreateVehicle()` bails before creating wheels.
 
+### Bisect plan for the next pass
+
+1. Spawn the same pawn in `ReviewMap` (flat 160 m floor, no slices, no UCX ground) and repeat the profile. Flies there too -> the asset/component is at fault. Settles there -> something in `DemoMap` (the UCS slabs, the terrain, or the world settings) drives it.
+2. In parallel, spawn a stock `AWheeledVehiclePawn` with `SK_Vehicle_Sedan` and default settings in the same spot: if the stock pawn settles, the difference is in `AGigLineVehicle`'s setup (mass override, stability control, our movement subclass).
+3. Only after the bisect: fix, then confirm `Wheels.Num() == 4`.
+
 ### Tasks
 
 - [ ] Give `SK_Vehicle_Sedan` a physics asset whose single chassis body matches the car's box and is positioned below the shell, then confirm the pawn settles on the road instead of launching.
@@ -60,6 +66,12 @@ So the wheel bones match, the terrain has no proxy lid, and stopping the mover d
 
 Split out of `0.3.0` on 2026-11-09 on the owner's instruction: the three hero-facade staging shots (`review-hero-facade-front`, `review-hero-facade-oblique`, `review-hero-portals`) were rejected as "rework needed to match reference", and that is asset work rather than vehicle work.
 
+### Bisect plan for the next pass
+
+1. Spawn the same pawn in `ReviewMap` (flat 160 m floor, no slices, no UCX ground) and repeat the profile. Flies there too -> the asset/component is at fault. Settles there -> something in `DemoMap` (the UCS slabs, the terrain, or the world settings) drives it.
+2. In parallel, spawn a stock `AWheeledVehiclePawn` with `SK_Vehicle_Sedan` and default settings in the same spot: if the stock pawn settles, the difference is in `AGigLineVehicle`'s setup (mass override, stability control, our movement subclass).
+3. Only after the bisect: fix, then confirm `Wheels.Num() == 4`.
+
 ### Tasks
 
 - [ ] Rebuild the El Capitan hero facade to match the reference photography: cornice depth, the banner proportions, window rhythm, and the three entry portals.