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First cut of a working origin shift component.
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103 changes: 103 additions & 0 deletions
103
Source/CesiumRuntime/Private/CesiumOriginShiftComponent.cpp
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| @@ -0,0 +1,103 @@ | ||
| // Copyright 2020-2023 CesiumGS, Inc. and Contributors | ||
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| #include "CesiumOriginShiftComponent.h" | ||
| #include "CesiumGeoreference.h" | ||
| #include "CesiumGlobeAnchorComponent.h" | ||
| #include "CesiumSubLevelComponent.h" | ||
| #include "CesiumSubLevelSwitcherComponent.h" | ||
| #include "CesiumWgs84Ellipsoid.h" | ||
| #include "LevelInstance/LevelInstanceActor.h" | ||
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| class ALevelInstance; | ||
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| UCesiumOriginShiftComponent::UCesiumOriginShiftComponent() : Super() { | ||
| this->PrimaryComponentTick.bCanEverTick = true; | ||
| this->PrimaryComponentTick.TickGroup = ETickingGroup::TG_PrePhysics; | ||
| } | ||
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| void UCesiumOriginShiftComponent::BeginPlay() { | ||
| Super::BeginPlay(); | ||
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| this->GlobeAnchor = nullptr; | ||
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| AActor* Owner = this->GetOwner(); | ||
| if (!Owner) | ||
| return; | ||
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| this->GlobeAnchor = | ||
| Owner->FindComponentByClass<UCesiumGlobeAnchorComponent>(); | ||
| if (!this->GlobeAnchor) { | ||
| // A globe anchor is missing and required, so add one. | ||
| this->GlobeAnchor = | ||
| Cast<UCesiumGlobeAnchorComponent>(Owner->AddComponentByClass( | ||
| UCesiumGlobeAnchorComponent::StaticClass(), | ||
| false, | ||
| FTransform::Identity, | ||
| false)); | ||
| Owner->AddInstanceComponent(this->GlobeAnchor); | ||
| } | ||
| } | ||
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| void UCesiumOriginShiftComponent::TickComponent( | ||
| float DeltaTime, | ||
| ELevelTick TickType, | ||
| FActorComponentTickFunction* ThisTickFunction) { | ||
| Super::TickComponent(DeltaTime, TickType, ThisTickFunction); | ||
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| if (!this->GlobeAnchor) | ||
| return; | ||
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| ACesiumGeoreference* Georeference = this->GlobeAnchor->ResolveGeoreference(); | ||
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| if (!Georeference) | ||
| return; | ||
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| UCesiumSubLevelSwitcherComponent* Switcher = | ||
| Georeference->GetSubLevelSwitcher(); | ||
| if (!Switcher) | ||
| return; | ||
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| const TArray<TWeakObjectPtr<ALevelInstance>>& Sublevels = | ||
| Switcher->GetRegisteredSubLevelsWeak(); | ||
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| if (Sublevels.Num() == 0) { | ||
| // If we don't have any known sub-levels, bail quickly to save ourselves a | ||
| // little work. | ||
| return; | ||
| } | ||
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| FVector ActorEcef = this->GlobeAnchor->GetEarthCenteredEarthFixedPosition(); | ||
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| ALevelInstance* ClosestActiveLevel = nullptr; | ||
| double ClosestLevelDistance = std::numeric_limits<double>::max(); | ||
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| for (int32 i = 0; i < Sublevels.Num(); ++i) { | ||
| ALevelInstance* Current = Sublevels[i].Get(); | ||
| if (!IsValid(Current)) | ||
| continue; | ||
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| UCesiumSubLevelComponent* SubLevelComponent = | ||
| Current->FindComponentByClass<UCesiumSubLevelComponent>(); | ||
| if (!IsValid(SubLevelComponent)) | ||
| continue; | ||
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| if (!SubLevelComponent->GetEnabled()) | ||
| continue; | ||
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| FVector LevelEcef = | ||
| UCesiumWgs84Ellipsoid::LongitudeLatitudeHeightToEarthCenteredEarthFixed( | ||
| FVector( | ||
| SubLevelComponent->GetOriginLongitude(), | ||
| SubLevelComponent->GetOriginLatitude(), | ||
| SubLevelComponent->GetOriginHeight())); | ||
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| double LevelDistance = FVector::Distance(LevelEcef, ActorEcef); | ||
| if (LevelDistance < SubLevelComponent->GetLoadRadius() && | ||
| LevelDistance < ClosestLevelDistance) { | ||
| ClosestActiveLevel = Current; | ||
| ClosestLevelDistance = LevelDistance; | ||
| } | ||
| } | ||
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| Switcher->SetTargetSubLevel(ClosestActiveLevel); | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,30 @@ | ||
| // Copyright 2020-2023 CesiumGS, Inc. and Contributors | ||
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| #pragma once | ||
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| #include "Components/ActorComponent.h" | ||
| #include "CoreMinimal.h" | ||
| #include "CesiumOriginShiftComponent.generated.h" | ||
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| class UCesiumGlobeAnchorComponent; | ||
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| UCLASS(ClassGroup = "Cesium", Meta = (BlueprintSpawnableComponent)) | ||
| class CESIUMRUNTIME_API UCesiumOriginShiftComponent : public UActorComponent { | ||
| GENERATED_BODY() | ||
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| public: | ||
| UCesiumOriginShiftComponent(); | ||
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| protected: | ||
| virtual void BeginPlay() override; | ||
| virtual void TickComponent( | ||
| float DeltaTime, | ||
| enum ELevelTick TickType, | ||
| FActorComponentTickFunction* ThisTickFunction) override; | ||
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| private: | ||
| // The globe anchor attached to the same Actor as this component. Don't | ||
| // save/load or copy this. It is set in BeginPlay. | ||
| UPROPERTY(Transient, DuplicateTransient, TextExportTransient) | ||
| UCesiumGlobeAnchorComponent* GlobeAnchor; | ||
| }; |
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