Method Tick

Source/URLab/Private/Cinematics/MjOrbitCameraActor.cpp:252–402

}

void AMjOrbitCameraActor::Tick(float DeltaTime)
{
	Super::Tick(DeltaTime);

	if (!CineCamera)
		return;

	// --- Playback mode: read camera transforms from replay ---
	if (bPlaybackCameraPath && ReplayMgr && ReplayMgr->bIsReplaying)
	{
		TArray<FMjReplayFrame>& Frames = ReplayMgr->Sessions.FindOrAdd(ReplayMgr->ActiveSessionName).Frames;
		if (Frames.Num() > 0)
		{
			// Find frame at current playback time (same logic as OnReplayStep)
			double StartTime = Frames[0].Timestamp;
			double TargetTime = StartTime + (double)ReplayMgr->PlaybackTime;

			int32 FoundIdx = 0;
			for (int32 i = 1; i < Frames.Num(); ++i)
			{
				if (Frames[i].Timestamp >= TargetTime)
					break;
				FoundIdx = i;
			}

			const FMjReplayFrame& Frame = Frames[FoundIdx];
			if (Frame.bHasCameraData)
			{
				FVector TargetCamPos = Frame.CameraPosition;

				// Apply RelPos offset if the target articulation has one
				// This shifts the camera the same way the robot position is shifted
				if (CurrentTarget)
				{
					TArray<FReplayArticulationBinding>& Bindings = ReplayMgr->GetArticulationBindings();
					for (const FReplayArticulationBinding& B : Bindings)
					{
						if (B.Articulation == CurrentTarget && B.bRelativePosition && B.bInitialsCaptured)
						{
							FVector Offset(
								B.InitialMjPosition.X - B.CsvStartPosition.X,
								B.InitialMjPosition.Y - B.CsvStartPosition.Y,
								B.InitialMjPosition.Z - B.CsvStartPosition.Z);
							// Convert MuJoCo meters offset to Unreal cm (x100)
							TargetCamPos += Offset * 100.0;
							break;
						}
					}
				}

				FVector CurrentPos = CineCamera->GetComponentLocation();
				FRotator CurrentRot = CineCamera->GetComponentRotation();

				FVector NewPos = FMath::VInterpTo(CurrentPos, TargetCamPos, DeltaTime, SmoothingSpeed);
				FRotator NewRot = FMath::RInterpTo(CurrentRot, Frame.CameraRotation, DeltaTime, SmoothingSpeed);

				CineCamera->SetWorldLocationAndRotation(NewPos, NewRot);