ue5 lyra camera

1、cameracomponent的修改

void UCameraComponent::GetCameraView(float DeltaTime, FMinimalViewInfo& DesiredView)
{//xr的不管if (GEngine && GEngine->XRSystem.IsValid() && GetWorld() && GetWorld()->WorldType != EWorldType::Editor ){IXRTrackingSystem* XRSystem = GEngine->XRSystem.Get();auto XRCamera = XRSystem->GetXRCamera();if (XRCamera.IsValid()){if (XRSystem->IsHeadTrackingAllowedForWorld(*GetWorld())){const FTransform ParentWorld = CalcNewComponentToWorld(FTransform());XRCamera->SetupLateUpdate(ParentWorld, this, bLockToHmd == 0);if (bLockToHmd){FQuat Orientation;FVector Position;if (XRCamera->UpdatePlayerCamera(Orientation, Position)){SetRelativeTransform(FTransform(Orientation, Position));}else{ResetRelativeTransform();}}XRCamera->OverrideFOV(this->FieldOfView);}}}//是否用pawn的controllrotation 默认是trueif (bUsePawnControlRotation){const APawn* OwningPawn = Cast<APawn>(GetOwner());const AController* OwningController = OwningPawn ? OwningPawn->GetController() : nullptr;if (OwningController && OwningController->IsLocalPlayerController()){//GetViewRotation()函数里面其实获得是controller的rotationconst FRotator PawnViewRotation = OwningPawn->GetViewRotation();if (!PawnViewRotation.Equals(GetComponentRotation())){SetWorldRotation(PawnViewRotation);}}}//还有offset功能默认是开启的if (bUseAdditiveOffset){FTransform OffsetCamToBaseCam = AdditiveOffset;FTransform BaseCamToWorld = GetComponentToWorld();FTransform OffsetCamToWorld = OffsetCamToBaseCam * BaseCamToWorld;DesiredView.Location = OffsetCamToWorld.GetLocation();DesiredView.Rotation = OffsetCamToWorld.Rotator();}else{DesiredView.Location = GetComponentLocation();DesiredView.Rotation = GetComponentRotation();}DesiredView.FOV = bUseAdditiveOffset ? (FieldOfView + AdditiveFOVOffset) : FieldOfView;DesiredView.AspectRatio = AspectRatio;DesiredView.bConstrainAspectRatio = bConstrainAspectRatio;DesiredView.bUseFieldOfViewForLOD = bUseFieldOfViewForLOD;DesiredView.ProjectionMode = ProjectionMode;DesiredView.OrthoWidth = OrthoWidth;DesiredView.OrthoNearClipPlane = OrthoNearClipPlane;DesiredView.OrthoFarClipPlane = OrthoFarClipPlane;// See if the CameraActor wants to override the PostProcess settings used.DesiredView.PostProcessBlendWeight = PostProcessBlendWeight;if (PostProcessBlendWeight > 0.0f){DesiredView.PostProcessSettings = PostProcessSettings;}// If this camera component has a motion vector simumlation transform, use that for the current view's previous transformDesiredView.PreviousViewTransform = FMotionVectorSimulation::Get().GetPreviousTransform(this);
}

//并没有调用super
void ULyraCameraComponent::GetCameraView(float DeltaTime, FMinimalViewInfo& DesiredView)
{check(CameraModeStack);//如果DetermineCameraModeDelegate有bind的cameramode就添加到CameraModeStack中UpdateCameraModes();FLyraCameraModeView CameraModeView;//CameraModeStack开始更新CameraModeStack->EvaluateStack(DeltaTime, CameraModeView);//在父类中component的rotation被动的跟随controller的rotation//但是在lyra中是多个cameramode共同blend后的ControlRotation再主动的影响pc的rotation//这样做有啥好处呢？// Keep player controller in sync with the latest view.if (APawn* TargetPawn = Cast<APawn>(GetTargetActor())){if (APlayerController* PC = TargetPawn->GetController<APlayerController>()){//把CameraModeView的ControlRotation强制更新pc的rotationPC->SetControlRotation(CameraModeView.ControlRotation);}}// Apply any offset that was added to the field of view.CameraModeView.FieldOfView += FieldOfViewOffset;FieldOfViewOffset = 0.0f;// Keep camera component in sync with the latest view.SetWorldLocationAndRotation(CameraModeView.Location, CameraModeView.Rotation);FieldOfView = CameraModeView.FieldOfView;// Fill in desired view.DesiredView.Location = CameraModeView.Location;DesiredView.Rotation = CameraModeView.Rotation;DesiredView.FOV = CameraModeView.FieldOfView;DesiredView.OrthoWidth = OrthoWidth;DesiredView.OrthoNearClipPlane = OrthoNearClipPlane;DesiredView.OrthoFarClipPlane = OrthoFarClipPlane;DesiredView.AspectRatio = AspectRatio;DesiredView.bConstrainAspectRatio = bConstrainAspectRatio;DesiredView.bUseFieldOfViewForLOD = bUseFieldOfViewForLOD;DesiredView.ProjectionMode = ProjectionMode;// See if the CameraActor wants to override the PostProcess settings used.DesiredView.PostProcessBlendWeight = PostProcessBlendWeight;if (PostProcessBlendWeight > 0.0f){DesiredView.PostProcessSettings = PostProcessSettings;}// 并没有cameracomponent的offset功能
}

流程方面：

每一帧都会调用ULyraCameraComponent::GetCameraView()

UpdateCameraModes()中

void ULyraCameraComponent::UpdateCameraModes()
{check(CameraModeStack);if (CameraModeStack->IsStackActivate()){//每一帧都会调用绑定在这个代理上的函数获得cameramodeif (DetermineCameraModeDelegate.IsBound()){if (const TSubclassOf<ULyraCameraMode> CameraMode = DetermineCameraModeDelegate.Execute()){CameraModeStack->PushCameraMode(CameraMode);}}}
}

//在这个component中，当pawn完成初始化的时候
//把代理和函数hook一下
void ULyraHeroComponent::OnPawnReadyToInitialize()
{if (!ensure(!bPawnHasInitialized)){// Don't initialize twicereturn;}APawn* Pawn = GetPawn<APawn>();if (!Pawn){return;}const bool bIsLocallyControlled = Pawn->IsLocallyControlled();ALyraPlayerState* LyraPS = GetPlayerState<ALyraPlayerState>();check(LyraPS);const ULyraPawnData* PawnData = nullptr;if (ULyraPawnExtensionComponent* PawnExtComp = ULyraPawnExtensionComponent::FindPawnExtensionComponent(Pawn)){PawnData = PawnExtComp->GetPawnData<ULyraPawnData>();// The player state holds the persistent data for this player (state that persists across deaths and multiple pawns).// The ability system component and attribute sets live on the player state.PawnExtComp->InitializeAbilitySystem(LyraPS->GetLyraAbilitySystemComponent(), LyraPS);}if (ALyraPlayerController* LyraPC = GetController<ALyraPlayerController>()){if (Pawn->InputComponent != nullptr){InitializePlayerInput(Pawn->InputComponent);}}if (bIsLocallyControlled && PawnData){if (ULyraCameraComponent* CameraComponent = ULyraCameraComponent::FindCameraComponent(Pawn)){//在这里代理和函数bind一下，就是说每一帧都会调用DetermineCameraMode()函数CameraComponent->DetermineCameraModeDelegate.BindUObject(this, &ThisClass::DetermineCameraMode);}}bPawnHasInitialized = true;
}

TSubclassOf<ULyraCameraMode> ULyraHeroComponent::DetermineCameraMode() const
{//有mode 就返回mode，这个mode是通过ga赋予的if (AbilityCameraMode){return AbilityCameraMode;}const APawn* Pawn = GetPawn<APawn>();if (!Pawn){return nullptr;}//如果没有技能的camera mode 就用pawndata中定义的角色默认的camera modeif (ULyraPawnExtensionComponent* PawnExtComp = ULyraPawnExtensionComponent::FindPawnExtensionComponent(Pawn)){if (const ULyraPawnData* PawnData = PawnExtComp->GetPawnData<ULyraPawnData>()){return PawnData->DefaultCameraMode;}}return nullptr;
}

void ULyraGameplayAbility::SetCameraMode(TSubclassOf<ULyraCameraMode> CameraMode)
{ENSURE_ABILITY_IS_INSTANTIATED_OR_RETURN(SetCameraMode, );if (ULyraHeroComponent* HeroComponent = GetHeroComponentFromActorInfo()){HeroComponent->SetAbilityCameraMode(CameraMode, CurrentSpecHandle);ActiveCameraMode = CameraMode;}
}void ULyraHeroComponent::SetAbilityCameraMode(TSubclassOf<ULyraCameraMode> CameraMode, const FGameplayAbilitySpecHandle& OwningSpecHandle)
{if (CameraMode){AbilityCameraMode = CameraMode;AbilityCameraModeOwningSpecHandle = OwningSpecHandle;}
}

技能用完就把技能cameramode撤销

//这个是个蓝图函数在技能的end中调用
void ULyraGameplayAbility::ClearCameraMode()
{ENSURE_ABILITY_IS_INSTANTIATED_OR_RETURN(ClearCameraMode, );if (ActiveCameraMode){if (ULyraHeroComponent* HeroComponent = GetHeroComponentFromActorInfo()){HeroComponent->ClearAbilityCameraMode(CurrentSpecHandle);}ActiveCameraMode = nullptr;}
}

简单来说就是有个默认的cameramode ，一旦有ga要求自己的camera mode 就会把ga 的mode添加到cameramodestack中

下面就是多个camera mode切换的时候是如何blend的

//此函数每帧都会执行
void ULyraCameraModeStack::PushCameraMode(TSubclassOf<ULyraCameraMode> CameraModeClass)
{if (!CameraModeClass){return;}//如果在instance的数组中找到已经有初始化的对象就直接返回。ULyraCameraMode* CameraMode = GetCameraModeInstance(CameraModeClass);check(CameraMode);int32 StackSize = CameraModeStack.Num();//如果要添加的cameramode 已经是在第一个了，就直接returnif ((StackSize > 0) && (CameraModeStack[0] == CameraMode)){// Already top of stack.return;}//如果第一个不等于要添加的，就for一下，如果在其他位置找到了，先remove再添加到第一个位置//假如数组中没有新来的，那么新来的weight最后值是0//如果新来的在数组里有，但是不是第一个，那么新来的weight会继承之前的weight// See if it's already in the stack and remove it.// Figure out how much it was contributing to the stack.int32 ExistingStackIndex = INDEX_NONE;float ExistingStackContribution = 1.0f;for (int32 StackIndex = 0; StackIndex < StackSize; ++StackIndex){if (CameraModeStack[StackIndex] == CameraMode){ExistingStackIndex = StackIndex;ExistingStackContribution *= CameraMode->GetBlendWeight();break;}else{ExistingStackContribution *= (1.0f - CameraModeStack[StackIndex]->GetBlendWeight());}}if (ExistingStackIndex != INDEX_NONE){CameraModeStack.RemoveAt(ExistingStackIndex);StackSize--;}else{ExistingStackContribution = 0.0f;}// Decide what initial weight to start with.const bool bShouldBlend = ((CameraMode->GetBlendTime() > 0.0f) && (StackSize > 0));const float BlendWeight = (bShouldBlend ? ExistingStackContribution : 1.0f);CameraMode->SetBlendWeight(BlendWeight);// Add new entry to top of stack.CameraModeStack.Insert(CameraMode, 0);// Make sure stack bottom is always weighted 100%.CameraModeStack.Last()->SetBlendWeight(1.0f);// Let the camera mode know if it's being added to the stack.if (ExistingStackIndex == INDEX_NONE){CameraMode->OnActivation();}
}

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