Pinned curves are a special case of non-periodic cubic curves (relevant only for BSpline and CatmullRom basis) where the authored intent is for each curve to begin and end at its first and last control points respectively. More...

#include <pinnedCurveExpandingSceneIndex.h>

Inheritance diagram for HdsiPinnedCurveExpandingSceneIndex:

Public Member Functions
HDSI_API HdSceneIndexPrim	GetPrim (const SdfPath &primPath) const override final
	Returns a pair of (prim type, datasource).

HDSI_API SdfPathVector	GetChildPrimPaths (const SdfPath &primPath) const override final
	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).

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 HdsiPinnedCurveExpandingSceneIndexRefPtr	New (const HdSceneIndexBaseRefPtr &inputSceneIndex)

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

Protected Member Functions
HDSI_API void	_PrimsAdded (const HdSceneIndexBase &sender, const HdSceneIndexObserver::AddedPrimEntries &entries) override final

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

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

HDSI_API	HdsiPinnedCurveExpandingSceneIndex (const HdSceneIndexBaseRefPtr &inputSceneIndex)

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

Pinned curves are a special case of non-periodic cubic curves (relevant only for BSpline and CatmullRom basis) where the authored intent is for each curve to begin and end at its first and last control points respectively.

This is done by setting the 'wrap' mode on the topology to 'pinned'.

Renderers that don't provide built-in support for pinned curves can use this scene index to "expand" or "unpack" the authored data. This involves the following:

Adding "phantom" points at the ends of each curve. For BSpline basis, each end point is repeated twice (so we have 3 consecutive identical points on each end) while for CatmullRom basis, each end point is repeated once. The topology is modified to reflect this.
Expanding vertex primvars to account for the additional control points and varying primvars to account for the additional segments.

Note: This scene index does not convert indexed curves (i.e., with authored curve indices) into non-indexed curves.

Definition at line 38 of file pinnedCurveExpandingSceneIndex.h.

Member Function Documentation

◆ _PrimsAdded()

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

finaloverrideprotectedvirtual

Implements HdSingleInputFilteringSceneIndexBase.

◆ _PrimsDirtied()

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

finaloverrideprotectedvirtual

Implements HdSingleInputFilteringSceneIndexBase.

◆ _PrimsRemoved()

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

finaloverrideprotectedvirtual

Implements HdSingleInputFilteringSceneIndexBase.

◆ GetChildPrimPaths()

HDSI_API SdfPathVector GetChildPrimPaths ( const SdfPath & primPath ) const

finaloverridevirtual

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. The traveral is expected to give exactly the set of paths where prim exists as defined in GetPrim. The traversal is also 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.

◆ GetPrim()

HDSI_API HdSceneIndexPrim GetPrim ( const SdfPath & primPath ) const

finaloverridevirtual

Returns a pair of (prim type, datasource).

A prim exists at primPath if and only if datasource is a non-null pointer. In particular, we consider the prim to exist even if the prim type or the container that datasource points to is empty.

Note that we require GetChildPrimPaths to be consistent with this notion of prim existence. That is, unless primPath is the absolute root path, the prim at primPath exists if and only if primPath is contained in GetChildPrimPaths of the parent path.

This function is expected to be threadsafe.

Implements HdSceneIndexBase.

The documentation for this class was generated from the following file:

pxr/imaging/hdsi/pinnedCurveExpandingSceneIndex.h

Public Member Functions

Static Public Member Functions

Protected Member Functions

Additional Inherited Members

Detailed Description

Member Function Documentation

◆ _PrimsAdded()

◆ _PrimsDirtied()

◆ _PrimsRemoved()

◆ GetChildPrimPaths()

◆ GetPrim()