\inmodule QtQuick3D \inherits QQuick3DObject More...

#include <qquick3dinstancing.h>

Inheritance diagram for QQuick3DInstancing:

Collaboration diagram for QQuick3DInstancing:

Classes
struct	InstanceTableEntry

Public Slots
void	setInstanceCountOverride (int instanceCountOverride)

void	setHasTransparency (bool hasTransparency)

void	setDepthSortingEnabled (bool enabled)

Public Slots inherited from QQuick3DObject
void	update ()

void	setParentItem (QQuick3DObject *parentItem)

Public Slots inherited from QObject
void	deleteLater ()
	\threadsafe

Signals
void	instanceTableChanged ()

void	instanceNodeDirty ()

void	instanceCountOverrideChanged ()

void	hasTransparencyChanged ()

void	depthSortingEnabledChanged ()

Signals inherited from QQuick3DObject
void	parentChanged ()

void	childrenChanged ()

void	stateChanged ()

Signals inherited from QObject
void	destroyed (QObject *=nullptr)
	This signal is emitted immediately before the object obj is destroyed, after any instances of QPointer have been notified, and cannot be blocked.

void	objectNameChanged (const QString &objectName, QPrivateSignal)
	This signal is emitted after the object's name has been changed.

Public Member Functions
	QQuick3DInstancing (QQuick3DObject *parent=nullptr)

	~QQuick3DInstancing () override

QByteArray	instanceBuffer (int *instanceCount)

int	instanceCountOverride () const

bool	hasTransparency () const

bool	depthSortingEnabled () const

	Q_REVISION (6, 3) Q_INVOKABLE QVector3D instancePosition(int index)

	Q_REVISION (6, 3) Q_INVOKABLE QVector3D instanceScale(int index)

	Q_REVISION (6, 3) Q_INVOKABLE QQuaternion instanceRotation(int index)

	Q_REVISION (6, 3) Q_INVOKABLE QColor instanceColor(int index)

	Q_REVISION (6, 3) Q_INVOKABLE QVector4D instanceCustomData(int index)

Public Member Functions inherited from QObject
Q_INVOKABLE	QObject (QObject *parent=nullptr)
	Constructs an object with parent object parent.

virtual	~QObject ()
	Destroys the object, deleting all its child objects.

virtual bool	event (QEvent *event)
	This virtual function receives events to an object and should return true if the event e was recognized and processed.

virtual bool	eventFilter (QObject watched, QEvent event)
	Filters events if this object has been installed as an event filter for the watched object.

QString	objectName () const

Q_WEAK_OVERLOAD void	setObjectName (const QString &name)
	Sets the object's name to name.

void	setObjectName (QAnyStringView name)
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

QBindable< QString >	bindableObjectName ()

bool	isWidgetType () const
	Returns `true` if the object is a widget; otherwise returns `false`.

bool	isWindowType () const
	Returns `true` if the object is a window; otherwise returns `false`.

bool	isQuickItemType () const
	Returns `true` if the object is a QQuickItem; otherwise returns `false`.

bool	signalsBlocked () const noexcept
	Returns `true` if signals are blocked; otherwise returns `false`.

bool	blockSignals (bool b) noexcept
	If block is true, signals emitted by this object are blocked (i.e., emitting a signal will not invoke anything connected to it).

QThread *	thread () const
	Returns the thread in which the object lives.

bool	moveToThread (QThread *thread QT6_DECL_NEW_OVERLOAD_TAIL)
	Changes the thread affinity for this object and its children and returns `true` on success.

int	startTimer (int interval, Qt::TimerType timerType=Qt::CoarseTimer)
	This is an overloaded function that will start a timer of type timerType and a timeout of interval milliseconds.

int	startTimer (std::chrono::nanoseconds time, Qt::TimerType timerType=Qt::CoarseTimer)

void	killTimer (int id)
	Kills the timer with timer identifier, id.

void	killTimer (Qt::TimerId id)

template<typename T >
T	findChild (QAnyStringView aName, Qt::FindChildOptions options=Qt::FindChildrenRecursively) const
	Returns the child of this object that can be cast into type T and that is called name, or \nullptr if there is no such object.

template<typename T >
QList< T >	findChildren (QAnyStringView aName, Qt::FindChildOptions options=Qt::FindChildrenRecursively) const
	Returns all children of this object with the given name that can be cast to type T, or an empty list if there are no such objects.

template<typename T >
T	findChild (Qt::FindChildOptions options=Qt::FindChildrenRecursively) const
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

template<typename T >
QList< T >	findChildren (Qt::FindChildOptions options=Qt::FindChildrenRecursively) const
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

const QObjectList &	children () const
	Returns a list of child objects.

void	setParent (QObject *parent)
	Makes the object a child of parent.

void	installEventFilter (QObject *filterObj)
	Installs an event filter filterObj on this object.

void	removeEventFilter (QObject *obj)
	Removes an event filter object obj from this object.

QMetaObject::Connection	connect (const QObject sender, const char signal, const char *member, Qt::ConnectionType type=Qt::AutoConnection) const

bool	disconnect (const char signal=nullptr, const QObject receiver=nullptr, const char *member=nullptr) const

bool	disconnect (const QObject receiver, const char member=nullptr) const

void	dumpObjectTree () const
	Dumps a tree of children to the debug output.

void	dumpObjectInfo () const
	Dumps information about signal connections, etc.

bool	setProperty (const char *name, const QVariant &value)
	Sets the value of the object's name property to value.

bool	setProperty (const char *name, QVariant &&value)

QVariant	property (const char *name) const
	Returns the value of the object's name property.

QList< QByteArray >	dynamicPropertyNames () const

QBindingStorage *	bindingStorage ()

const QBindingStorage *	bindingStorage () const

QObject *	parent () const
	Returns a pointer to the parent object.

bool	inherits (const char *classname) const
	Returns `true` if this object is an instance of a class that inherits className or a QObject subclass that inherits className; otherwise returns `false`.

Public Member Functions inherited from QQmlParserStatus
	QQmlParserStatus ()

virtual	~QQmlParserStatus ()

Protected Member Functions
virtual QByteArray	getInstanceBuffer (int *instanceCount)=0
	Implement this function to return the contents of the instance table.

void	markDirty ()
	Mark that the instance data has changed and must be uploaded again.

QSSGRenderGraphObject *	updateSpatialNode (QSSGRenderGraphObject *node) override

Protected Member Functions inherited from QQuick3DObject
virtual void	markAllDirty ()

virtual void	itemChange (ItemChange, const ItemChangeData &)

	QQuick3DObject (QQuick3DObjectPrivate &dd, QQuick3DObject *parent=nullptr)

void	classBegin () override
	Invoked after class creation, but before any properties have been set.

void	componentComplete () override
	Invoked after the root component that caused this instantiation has completed construction.

bool	isComponentComplete () const

virtual void	preSync ()

Protected Member Functions inherited from QObject
QObject *	sender () const
	Returns a pointer to the object that sent the signal, if called in a slot activated by a signal; otherwise it returns \nullptr.

int	senderSignalIndex () const

int	receivers (const char *signal) const
	Returns the number of receivers connected to the signal.

bool	isSignalConnected (const QMetaMethod &signal) const

virtual void	timerEvent (QTimerEvent *event)
	This event handler can be reimplemented in a subclass to receive timer events for the object.

virtual void	childEvent (QChildEvent *event)
	This event handler can be reimplemented in a subclass to receive child events.

virtual void	customEvent (QEvent *event)
	This event handler can be reimplemented in a subclass to receive custom events.

virtual void	connectNotify (const QMetaMethod &signal)

virtual void	disconnectNotify (const QMetaMethod &signal)

	QObject (QObjectPrivate &dd, QObject *parent=nullptr)

Static Protected Member Functions
static InstanceTableEntry	calculateTableEntry (const QVector3D &position, const QVector3D &scale, const QVector3D &eulerRotation, const QColor &color, const QVector4D &customData={})
	Converts the position scale eulerRotation color and customData to the instance table format expected by the standard vertex shaders.

static InstanceTableEntry	calculateTableEntryFromQuaternion (const QVector3D &position, const QVector3D &scale, const QQuaternion &rotation, const QColor &color, const QVector4D &customData={})
	Converts the position scale rotation color and customData to the instance table format expected by the standard vertex shaders.

Properties
int	instanceCountOverride

bool	hasTransparency
	\qmlproperty bool Instancing::hasTransparency

bool	depthSortingEnabled
	\qmlproperty bool Instancing::depthSortingEnabled

Properties inherited from QQuick3DObject
QQuick3DObject *	parent
	\qmlproperty Object3D QtQuick3D::Object3D::parent This property holds the parent of the Object3D in a 3D scene.

Properties inherited from QObject
QString	objectName
	the name of this object

Additional Inherited Members
Static Public Member Functions inherited from QObject
static QMetaObject::Connection	connect (const QObject sender, const char signal, const QObject receiver, const char member, Qt::ConnectionType=Qt::AutoConnection)
	\threadsafe

static QMetaObject::Connection	connect (const QObject sender, const QMetaMethod &signal, const QObject receiver, const QMetaMethod &method, Qt::ConnectionType type=Qt::AutoConnection)

template<typename Func1 , typename Func2 >
static QMetaObject::Connection	connect (const typename QtPrivate::FunctionPointer< Func1 >::Object sender, Func1 signal, const typename QtPrivate::ContextTypeForFunctor< Func2 >::ContextType context, Func2 &&slot, Qt::ConnectionType type=Qt::AutoConnection)

template<typename Func1 , typename Func2 >
static QMetaObject::Connection	connect (const typename QtPrivate::FunctionPointer< Func1 >::Object *sender, Func1 signal, Func2 &&slot)

static bool	disconnect (const QObject sender, const char signal, const QObject receiver, const char member)
	\threadsafe

static bool	disconnect (const QObject sender, const QMetaMethod &signal, const QObject receiver, const QMetaMethod &member)

static bool	disconnect (const QMetaObject::Connection &)
	Disconnect a connection.

template<typename Func1 , typename Func2 >
static bool	disconnect (const typename QtPrivate::FunctionPointer< Func1 >::Object sender, Func1 signal, const typename QtPrivate::FunctionPointer< Func2 >::Object receiver, Func2 slot)

template<typename Func1 >
static bool	disconnect (const typename QtPrivate::FunctionPointer< Func1 >::Object sender, Func1 signal, const QObject receiver, void **zero)

Protected Attributes inherited from QObject
QScopedPointer< QObjectData >	d_ptr

Related Symbols inherited from QObject
template< class T > T	qobject_cast (const QObject *object)
	Returns the given object cast to type T if the object is of type T (or of a subclass); otherwise returns \nullptr.

template< typename T > T	qFindChildqFindChildren (const QObject *obj, const QString &name)()

template< typename T > QList< T >	qFindChildrenqFindChildren (const QObject *obj, const QString &name)()

	QObjectList
	\macro Q_CLASSINFO(Name, Value)

Detailed Description

\inmodule QtQuick3D \inherits QQuick3DObject

Since: 6.2

Base class for defining instance tables.

The QQuick3DInstancing class can be inherited to specify a custom instance table for a Model in the Qt Quick 3D scene.

This class is abstract: To use it, create a subclass and implement \l getInstanceBuffer().

Definition at line 16 of file qquick3dinstancing.h.

Constructor & Destructor Documentation

◆ QQuick3DInstancing()

QQuick3DInstancing::QQuick3DInstancing ( QQuick3DObject * parent = nullptr )

explicit

Definition at line 124 of file qquick3dinstancing.cpp.

◆ ~QQuick3DInstancing()

QQuick3DInstancing::~QQuick3DInstancing ( )

override

Definition at line 129 of file qquick3dinstancing.cpp.

Member Function Documentation

◆ calculateTableEntry()

QQuick3DInstancing::InstanceTableEntry QQuick3DInstancing::calculateTableEntry	(	const QVector3D &	position,
		const QVector3D &	scale,
		const QVector3D &	eulerRotation,
		const QColor &	color,
		const QVector4D &	customData = {} )

staticprotected

Converts the position scale eulerRotation color and customData to the instance table format expected by the standard vertex shaders.

Typical pattern:

QByteArray MyInstanceTable::getInstanceBuffer(int *instanceCount)
{
    QByteArray instanceData;
 
    ...
 
    auto entry = calculateTableEntry({xPos, yPos, zPos}, {xScale, yScale, zScale}, {xRot, yRot, zRot}, color, {});
    instanceData.append(reinterpret_cast<const char *>(&entry), sizeof(entry));

See also: calculateTableEntryFromQuaternion

Definition at line 422 of file qquick3dinstancing.cpp.

References calculate(), and position().

Referenced by QQuick3DParticleInstanceTable::addInstance(), and QQuick3DFileInstancing::loadFromXmlFile().

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◆ calculateTableEntryFromQuaternion()

QQuick3DInstancing::InstanceTableEntry QQuick3DInstancing::calculateTableEntryFromQuaternion	(	const QVector3D &	position,
		const QVector3D &	scale,
		const QQuaternion &	rotation,
		const QColor &	color,
		const QVector4D &	customData = {} )

staticprotected

Converts the position scale rotation color and customData to the instance table format expected by the standard vertex shaders.

This is the same as calculateTableEntry(), except for using a quaternion to specify the rotation.

Definition at line 440 of file qquick3dinstancing.cpp.

References position(), and xform.

Referenced by QQuick3DFileInstancing::loadFromXmlFile().

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◆ depthSortingEnabled()

bool QQuick3DInstancing::depthSortingEnabled ( ) const

Definition at line 158 of file qquick3dinstancing.cpp.

References d.

◆ depthSortingEnabledChanged

void QQuick3DInstancing::depthSortingEnabledChanged ( )

signal

Referenced by setDepthSortingEnabled().

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◆ getInstanceBuffer()

QByteArray QQuick3DInstancing::getInstanceBuffer ( int * instanceCount )

protectedpure virtual

Implement this function to return the contents of the instance table.

The number of instances should be returned in instanceCount. The subclass is responsible for caching the result if necessary. If the instance table changes, the subclass should call markDirty().

Implemented in QQuick3DRandomInstancing, QQuick3DInstanceList, QQuick3DFileInstancing, and QQuick3DParticleInstanceTable.

Referenced by instanceBuffer(), and updateSpatialNode().

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◆ hasTransparency()

bool QQuick3DInstancing::hasTransparency ( ) const

Definition at line 152 of file qquick3dinstancing.cpp.

References d.

◆ hasTransparencyChanged

void QQuick3DInstancing::hasTransparencyChanged ( )

signal

Referenced by setHasTransparency().

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◆ instanceBuffer()

QByteArray QQuick3DInstancing::instanceBuffer ( int * instanceCount )

Returns the content of the instancing table for testing purposes.

Definition at line 137 of file qquick3dinstancing.cpp.

References d, getInstanceBuffer(), instanceCount, and qMin().

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◆ instanceCountOverride()

int QQuick3DInstancing::instanceCountOverride ( ) const

Definition at line 146 of file qquick3dinstancing.cpp.

References d.

◆ instanceCountOverrideChanged

void QQuick3DInstancing::instanceCountOverrideChanged ( )

signal

Referenced by setInstanceCountOverride().

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◆ instanceNodeDirty

void QQuick3DInstancing::instanceNodeDirty ( )

signal

Referenced by QQuick3DModel::setInstancing(), and updateSpatialNode().

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◆ instanceTableChanged

void QQuick3DInstancing::instanceTableChanged ( )

signal

Referenced by markDirty(), and InstanceModel::setInstancing().

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◆ markDirty()

void QQuick3DInstancing::markDirty ( )

protected

Mark that the instance data has changed and must be uploaded again.

See also: getInstanceBuffer, instanceCountOverride

Definition at line 334 of file qquick3dinstancing.cpp.

References QQuick3DObjectPrivate::Content, d, emit, and instanceTableChanged().

Referenced by QQuick3DParticleInstanceTable::commit(), QQuick3DRandomInstancing::setColor(), QQuick3DRandomInstancing::setColorModel(), QQuick3DRandomInstancing::setCustomData(), QQuick3DRandomInstancing::setInstanceCount(), QQuick3DRandomInstancing::setPosition(), QQuick3DRandomInstancing::setRandomSeed(), QQuick3DRandomInstancing::setRotation(), QQuick3DRandomInstancing::setScale(), and QQuick3DFileInstancing::setSource().

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◆ Q_REVISION() [1/5]

QQuick3DInstancing::Q_REVISION	(	6	,
		3	)

◆ Q_REVISION() [2/5]

QQuick3DInstancing::Q_REVISION	(	6	,
		3	)

◆ Q_REVISION() [3/5]

QQuick3DInstancing::Q_REVISION	(	6	,
		3	)

◆ Q_REVISION() [4/5]

QQuick3DInstancing::Q_REVISION	(	6	,
		3	)

◆ Q_REVISION() [5/5]

QQuick3DInstancing::Q_REVISION	(	6	,
		3	)

◆ setDepthSortingEnabled

void QQuick3DInstancing::setDepthSortingEnabled ( bool enabled )

slot

Definition at line 317 of file qquick3dinstancing.cpp.

References QQuick3DObjectPrivate::Content, d, depthSortingEnabledChanged(), emit, and enabled.

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◆ setHasTransparency

void QQuick3DInstancing::setHasTransparency ( bool hasTransparency )

slot

Definition at line 306 of file qquick3dinstancing.cpp.

References QQuick3DObjectPrivate::Content, d, emit, hasTransparency, and hasTransparencyChanged().

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◆ setInstanceCountOverride

void QQuick3DInstancing::setInstanceCountOverride ( int instanceCountOverride )

slot

Definition at line 294 of file qquick3dinstancing.cpp.

References QQuick3DObjectPrivate::Content, d, emit, instanceCountOverride, and instanceCountOverrideChanged().

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◆ updateSpatialNode()

QSSGRenderGraphObject * QQuick3DInstancing::updateSpatialNode ( QSSGRenderGraphObject * node )

overrideprotectedvirtual

Reimplemented from QQuick3DObject.

Definition at line 342 of file qquick3dinstancing.cpp.

References d, emit, getInstanceBuffer(), instanceNodeDirty(), QQuick3DObject::markAllDirty(), qMin(), and QQuick3DObject::updateSpatialNode().

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Property Documentation

◆ depthSortingEnabled

QQuick3DInstancing::depthSortingEnabled

readwrite

\qmlproperty bool Instancing::depthSortingEnabled

Holds the depth sorting enabled value for the instance table. When enabled, instances are sorted and rendered from the furthest instance from the camera to the nearest i.e. back-to-front. If disabled, which is the default, instances are rendered in the order they are specified in the instance table.

Note: The instances are only sorted against each other. Instances are not sorted against other objects in the scene.; The sorting increases the frame preparation time especially with large instance counts.

Holds the depth sorting enabled value for the instance table. When enabled, instances are sorted and rendered from the furthest instance from the camera to the nearest i.e. back-to-front. If disabled, which is the default, instances are rendered in the order they are specified in the instance table.

Note: The instances are only sorted against each other. Instances are not sorted against other objects in the scene.; The sorting increases the frame preparation time especially with large instance counts.

Definition at line 26 of file qquick3dinstancing.h.

◆ hasTransparency

QQuick3DInstancing::hasTransparency

readwrite

\qmlproperty bool Instancing::hasTransparency

Set this property to true if the instancing table contains alpha values that should be used when rendering the model. This property only makes a difference if the model is opaque: If the model has a transparent \l{Model::materials}{material}, or an \l{Node::opacity}{opacity} less than one, the alpha value from the table will be used regardless.

Note: Enabling alpha blending may cause rendering issues when instances overlap. See the \l{Alpha-blending and instancing}{alpha blending and instancing} documentation for details.

Set this property to true if the instancing table contains alpha values that should be used when rendering the model. This property only makes a difference if the model is opaque: If the model has a transparent \l{Model::materials}{material}, or an \l{Node::opacity}{opacity} less than one, the alpha value from the table will be used regardless.

Note: Enabling alpha blending may cause rendering issues when instances overlap. See the \l{Alpha-blending and instancing}{alpha blending and instancing} documentation for details.

Definition at line 25 of file qquick3dinstancing.h.

Referenced by setHasTransparency().

◆ instanceCountOverride

int QQuick3DInstancing::instanceCountOverride

readwrite

Definition at line 24 of file qquick3dinstancing.h.

Referenced by setInstanceCountOverride().

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

qtquick3d/src/quick3d/qquick3dinstancing.h (ed39d7a18a4ddfc0cc9197b3b0863c1443fe3b8a)
qtquick3d/src/quick3d/qquick3dinstancing.cpp (2b139225745a94ab4fa7e30f28cd0207469ee68e)

Classes

Public Slots

Signals

Public Member Functions

Protected Member Functions

Static Protected Member Functions

Properties

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ QQuick3DInstancing()

◆ ~QQuick3DInstancing()

Member Function Documentation

◆ calculateTableEntry()

◆ calculateTableEntryFromQuaternion()

◆ depthSortingEnabled()

◆ depthSortingEnabledChanged

◆ getInstanceBuffer()

◆ hasTransparency()

◆ hasTransparencyChanged

◆ instanceBuffer()

◆ instanceCountOverride()

◆ instanceCountOverrideChanged

◆ instanceNodeDirty

◆ instanceTableChanged

◆ markDirty()

◆ Q_REVISION() [1/5]

◆ Q_REVISION() [2/5]

◆ Q_REVISION() [3/5]

◆ Q_REVISION() [4/5]

◆ Q_REVISION() [5/5]

◆ setDepthSortingEnabled

◆ setHasTransparency

◆ setInstanceCountOverride

◆ updateSpatialNode()

Property Documentation

◆ depthSortingEnabled

◆ hasTransparency

◆ instanceCountOverride