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  3. UUsdAssetCache2

UUsdAssetCache2

Owns the assets generated and reused by USD Stages, allowing thread-safe retrieval/storage.

API > API/Plugins > API/Plugins/USDClasses

Owns the assets generated and reused by USD Stages, allowing thread-safe retrieval/storage.

   
Name UUsdAssetCache2
Type class
Header File /Engine/Plugins/Runtime/USDCore/Source/USDClasses/Public/USDAssetCache2.h
Include Path #include "USDAssetCache2.h"

Syntax

UCLASS (MinimalAPI, BlueprintType, Blueprintable)  
class UUsdAssetCache2 : public UObject

Inheritance Hierarchy

Constructors

Name Remarks Include Path Unreal Specifiers

UUsdAssetCache2()

   USDAssetCache2.h  

Classes

Name Remarks
FCachedAssetInfo Describes all information we know about an asset in storage.

Variables

Public

Name Type Remarks Include Path Unreal Specifiers
PersistentAssetStorageSizeMB double This limit specifies how much size is allocated to storing all persistent assets (i.e. assets that will be saved to disk, even if unused by any stage). USDAssetCache2.h
  • EditAnywhere
  • BlueprintReadWrite
  • Category="Settings"
UnreferencedAssetStorageSizeMB double The asset cache will always retain all currently used assets. USDAssetCache2.h
  • EditAnywhere
  • BlueprintReadWrite
  • Category="Settings"

Protected

Name Type Remarks Include Path Unreal Specifiers
ActiveAssets TSet< UObject * > Assets that were added/retrieved since the last call to MarkAssetsAsSlate();. USDAssetCache2.h  
AssetStorage TMap< FString, TObjectPtr< UObject > > Main hash to asset storage for all assets that we're currently using and shouldn't be GC'd. USDAssetCache2.h
  • Transient
  • VisibleAnywhere
  • Category="Owned Assets"
CurrentScopedReferencer const UObject * When this is set to something, we will track that it is referencing any new asset that we cache. USDAssetCache2.h  
LRUCache TLruCache< FSoftObjectPath, FCachedAssetInfo > Main storage of assets in most recent to least recently used. USDAssetCache2.h  
PendingPersistentStorage TMap< FString, FSoftObjectPath > Storage of paths to additional assets that we know are persisted on disk (and tracked on LRUCache), but that we haven't loaded from bulkdata in this session yet USDAssetCache2.h  
RWLock FRWLock Used to ensure thread safety. USDAssetCache2.h  

Functions

Public

Name Remarks Include Path Unreal Specifiers

bool AddAssetReference ( const UObject* Asset,
const UObject* Referencer
)

 Adds a new UObject referencer to a particular asset, returning true if the operation succeeded. USDAssetCache2.h
  • BlueprintCallable
  • Category="Caching"
  • Meta=(CallInEditor="true")

void CacheAsset ( const FString& Hash,
UObject* Asset,
const UObject* Referencer
)

 Adds an asset to the cache attached to a particular hash, and optionally registering a referencer USDAssetCache2.h
  • BlueprintCallable
  • Category="Caching"
  • Meta=(CallInEditor="true")

bool CanRemoveAsset ( const FString& Hash
)

 Returns true if the asset with the given hash can be removed from the cache. USDAssetCache2.h
  • BlueprintCallable
  • Category="Caching"
  • Meta=(CallInEditor="true")

TSet< UObject * > GetActiveAssets()

 Returns assets that aren't marked as stale USDAssetCache2.h  
Returns all asset hashes tracked by the asset cache, for all storage types. USDAssetCache2.h
  • BlueprintCallable
  • Category="USD"
  • Meta=(CallInEditor="true")
Returns all asset paths tracked by the asset cache, for all storage types. USDAssetCache2.h
  • BlueprintCallable
  • Category="USD"
  • Meta=(CallInEditor="true")
Returns all assets that are currently loaded in the asset cache. USDAssetCache2.h
  • BlueprintCallable
  • Category="USD"
  • Meta=(CallInEditor="true")

UObject * GetCachedAsset ( const FString& Hash
)

 Returns an asset associated with a particular `Hash_. USDAssetCache2.h
  • BlueprintCallable
  • Category="Caching"
  • Meta=(CallInEditor="true")

FString GetHashForAsset ( const UObject* Asset
) const

 Returns the hash associated with an asset, in case we own it. USDAssetCache2.h
  • BlueprintCallable
  • Category="USD"
  • Meta=(CallInEditor="true")

int32 GetNumAssets()

 Returns how many assets are tracked by the asset cache in total (summing up persistent, referenced and unreferenced storage) USDAssetCache2.h
  • BlueprintCallable
  • Category="USD"
  • Meta=(CallInEditor="true")

bool IsAssetOwnedByCache ( const FString& AssetPath
) const

 Returns true in case the asset at `AssetPath_ is tracked by the cache in any way (persistent asset, unreferenced or referenced). USDAssetCache2.h
  • BlueprintCallable
  • Category="USD"
  • Meta=(CallInEditor="true")
Every time an asset is retrieved/inserted we add it to ActiveAssets. USDAssetCache2.h  

void RefreshStorage ()

 Updates which assets belong to each storage type. USDAssetCache2.h
  • BlueprintCallable
  • Category="Settings"
  • Meta=(CallInEditor="true")

bool RemoveAllAssetReferences ( const UObject* Referencer
)

 Removes the particular referencer to all assets tracked by the cache, if it was a referencer to any of them. USDAssetCache2.h
  • BlueprintCallable
  • Category="Caching"
  • Meta=(CallInEditor="true")

UObject * RemoveAsset ( const FString& Hash
)

 If an asset is associated with `Hash_, it will be returned and the asset cache will stop tracking this asset entirely. USDAssetCache2.h
  • BlueprintCallable
  • Category="Caching"
  • Meta=(CallInEditor="true")

bool RemoveAssetReference ( const UObject* Asset,
const UObject* Referencer
)

 Removes an UObject referencer from a particular asset, returning true if the operation succeeded. USDAssetCache2.h
  • BlueprintCallable
  • Category="Caching"
  • Meta=(CallInEditor="true")

void Reset()

 Discards all tracked assets across all storage types USDAssetCache2.h
  • BlueprintCallable
  • Category="Settings"
  • Meta=(CallInEditor="true")

bool TouchAsset ( const UObject* Asset,
const UObject* Referencer
)

 Marks the provided asset as being used at this point, optionally adding a specific referencer. USDAssetCache2.h
  • BlueprintCallable
  • Category="Caching"
  • Meta=(CallInEditor="true")

Overridden from UObject

Name Remarks Include Path Unreal Specifiers

virtual void PostEditChangeProperty ( FPropertyChangedEvent& PropertyChangedEvent
)

 Begin UObject interfacte. USDAssetCache2.h  

virtual void PostLoad()

   USDAssetCache2.h  

virtual void Serialize ( FArchive& Ar
)

   USDAssetCache2.h  

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