Scene index that implements light linking semantics by: More...

#include <lightLinkingSceneIndex.h>

Inheritance diagram for HdsiLightLinkingSceneIndex:

Public Member Functions
HDSI_API HdSceneIndexPrim	GetPrim (const SdfPath &primPath) const override
	Returns a pair of (prim type, datasource) for the object at `primPath`.

HDSI_API SdfPathVector	GetChildPrimPaths (const SdfPath &primPath) const override
	Returns the paths of all scene index prims located immediately below `primPath`.

Public Member Functions inherited from HdSingleInputFilteringSceneIndexBase
HD_API std::vector< HdSceneIndexBaseRefPtr >	GetInputScenes () const final

virtual std::vector< HdSceneIndexBaseRefPtr >	GetInputScenes () const =0

Public Member Functions inherited from HdSceneIndexBase
HD_API void	AddObserver (const HdSceneIndexObserverPtr &observer)
	Adds an observer to this scene index.

HD_API void	RemoveObserver (const HdSceneIndexObserverPtr &observer)
	Removes an observer from this scene index; the given observer will no longer be forwarded notices.

virtual HdSceneIndexPrim	GetPrim (const SdfPath &primPath) const =0
	Returns a pair of (prim type, datasource) for the object at `primPath`.

virtual SdfPathVector	GetChildPrimPaths (const SdfPath &primPath) const =0
	Returns the paths of all scene index prims located immediately below `primPath`.

HdDataSourceBaseHandle	GetDataSource (const SdfPath &primPath, const HdDataSourceLocator &locator) const
	A convenience function: look up the object at `primPath`, and if successful return the datasource at `locator` within that prim.

HD_API void	SystemMessage (const TfToken &messageType, const HdDataSourceBaseHandle &args)
	Sends a message with optional arguments to this and any upstream input scene indices.

HD_API std::string	GetDisplayName () const
	Returns a value previously set by SetDisplayName.

HD_API void	SetDisplayName (const std::string &n)
	Allows for scene index instances to be identified in a more contextually relevant way.

HD_API void	AddTag (const TfToken &tag)
	Adds a specified tag token to a scene index instance.

HD_API void	RemoveTag (const TfToken &tag)
	Removes a specified tag token to a scene index instance.

HD_API bool	HasTag (const TfToken &tag) const
	Returns true if a specified tag token has been added to a scene index instance.

HD_API TfTokenVector	GetTags () const
	Returns all tag tokens currently added to a scene index instance.

Public Member Functions inherited from TfRefBase
	TfRefBase (TfRefBase const &)

TfRefBase &	operator= (TfRefBase const &)

size_t	GetCurrentCount () const
	Return the current reference count of this object.

bool	IsUnique () const
	Return true if only one `TfRefPtr` points to this object.

void	SetShouldInvokeUniqueChangedListener (bool shouldCall)

Public Member Functions inherited from TfWeakBase
	TfWeakBase (const TfWeakBase &)

const TfWeakBase &	__GetTfWeakBase__ () const

const TfWeakBase &	operator= (const TfWeakBase &)

void	EnableNotification2 () const

TF_API void const *	GetUniqueIdentifier () const

Static Public Member Functions
static HDSI_API HdSceneIndexBaseRefPtr	New (const HdSceneIndexBaseRefPtr &inputSceneIndex, const HdContainerDataSourceHandle &inputArgs)

Static Public Member Functions inherited from TfRefBase
static TF_API void	SetUniqueChangedListener (UniqueChangedListener listener)

Protected Member Functions
HDSI_API	HdsiLightLinkingSceneIndex (const HdSceneIndexBaseRefPtr &inputSceneIndex, const HdContainerDataSourceHandle &inputArgs)

HDSI_API void	_PrimsAdded (const HdSceneIndexBase &sender, const HdSceneIndexObserver::AddedPrimEntries &entries) override

HDSI_API void	_PrimsRemoved (const HdSceneIndexBase &sender, const HdSceneIndexObserver::RemovedPrimEntries &entries) override

HDSI_API void	_PrimsDirtied (const HdSceneIndexBase &sender, const HdSceneIndexObserver::DirtiedPrimEntries &entries) override

Protected Member Functions inherited from HdSingleInputFilteringSceneIndexBase
HD_API	HdSingleInputFilteringSceneIndexBase (const HdSceneIndexBaseRefPtr &inputSceneIndex)

virtual void	_PrimsAdded (const HdSceneIndexBase &sender, const HdSceneIndexObserver::AddedPrimEntries &entries)=0

virtual void	_PrimsRemoved (const HdSceneIndexBase &sender, const HdSceneIndexObserver::RemovedPrimEntries &entries)=0

virtual void	_PrimsDirtied (const HdSceneIndexBase &sender, const HdSceneIndexObserver::DirtiedPrimEntries &entries)=0

virtual HD_API void	_PrimsRenamed (const HdSceneIndexBase &sender, const HdSceneIndexObserver::RenamedPrimEntries &entries)

const HdSceneIndexBaseRefPtr &	_GetInputSceneIndex () const
	Returns the input scene.

Protected Member Functions inherited from HdSceneIndexBase
HD_API void	_SendPrimsAdded (const HdSceneIndexObserver::AddedPrimEntries &entries)
	Notify attached observers of prims added to the scene.

HD_API void	_SendPrimsRemoved (const HdSceneIndexObserver::RemovedPrimEntries &entries)
	Notify attached observers of prims removed from the scene.

HD_API void	_SendPrimsDirtied (const HdSceneIndexObserver::DirtiedPrimEntries &entries)
	Notify attached observers of datasource invalidations from the scene.

HD_API void	_SendPrimsRenamed (const HdSceneIndexObserver::RenamedPrimEntries &entries)
	Notify attached observers of prims (and their descendents) which have been renamed or reparented.

HD_API bool	_IsObserved () const
	Returns whether the scene index has any registered observers; this information can be used to skip work preparing notices when there are no observers.

virtual HD_API void	_SystemMessage (const TfToken &messageType, const HdDataSourceBaseHandle &args)
	Implement in order to react directly to system messages sent from downstream.

Protected Member Functions inherited from TfWeakBase
TfRefPtr< Tf_Remnant >	_Register () const

template<class T >
TfRefPtr< Tf_Remnant >	_Register (T *tempRmnt) const

bool	_HasRemnant () const

Additional Inherited Members
Public Types inherited from TfRefBase
typedef void(*	UniqueChangedFuncPtr) (TfRefBase const *, bool)

Detailed Description

Scene index that implements light linking semantics by:

discovering light linking collections on lights and light filters; this may be configured using the inputArgs c'tor argument by providing a HdTokenArrayDataSourceHandle for lightPrimTypes and lightFilterPrimTypes.
assigning a category ID token to each unique collection based on its membership expression; in PRMan parlance, this is the value fed to the "grouping:membership" attribute on the light/light filter. Trivial collections that include all prims in the scene use the empty token.
invalidating the categories locator on prims targeted (i.e. matched) by the expression,
invalidating the light/light filter prim when the category ID for its linking collection has changed, and
computing the categories that a (geometry) prim belong to; the list of prim types affected by linking may be configured using the inputArgs c'tor argument by providing a HdTokenArrayDataSourceHandle for geometryPrimTypes.

Note: Current support does not handle instanced prims (be it natively instanced, or prototype prims under point instancers) due to limitations in the HdCollectionExpressionEvaluator. This will be addressed in a future change.; For legacy scene delegates that implement light linking (e.g. UsdImagingDelegate) and don't transport the light linking collections, this scene index should leave the category(ies) unaffected on the light, geometry prims and instancers.

Definition at line 77 of file lightLinkingSceneIndex.h.

Member Function Documentation

◆ _PrimsAdded()

HDSI_API void _PrimsAdded	(	const HdSceneIndexBase &	sender,
		const HdSceneIndexObserver::AddedPrimEntries &	entries
	)

overrideprotectedvirtual

Implements HdSingleInputFilteringSceneIndexBase.

◆ _PrimsDirtied()

HDSI_API void _PrimsDirtied	(	const HdSceneIndexBase &	sender,
		const HdSceneIndexObserver::DirtiedPrimEntries &	entries
	)

overrideprotectedvirtual

Implements HdSingleInputFilteringSceneIndexBase.

◆ _PrimsRemoved()

HDSI_API void _PrimsRemoved	(	const HdSceneIndexBase &	sender,
		const HdSceneIndexObserver::RemovedPrimEntries &	entries
	)

overrideprotectedvirtual

Implements HdSingleInputFilteringSceneIndexBase.

◆ GetChildPrimPaths()

HDSI_API SdfPathVector GetChildPrimPaths ( const SdfPath & primPath ) const

overridevirtual

Returns the paths of all scene index prims located immediately below primPath.

This function can be used to traverse the scene by recursing from SdfPath::AbsoluteRootPath(); such a traversal is expected to give the same set of prims as the flattening of the scene index's PrimsAdded and PrimsRemoved messages. This function is expected to be threadsafe.

Implements HdSceneIndexBase.