QAttribute Class

class Qt3DCore::QAttribute

Defines an attribute and how data should be read from a QBuffer. More...

Header:	#include <Qt3DCore/QAttribute>
CMake:	find_package(Qt6 REQUIRED COMPONENTS 3dcore) target_link_libraries(mytarget PRIVATE Qt6::3dcore)
qmake:	QT += 3dcore
Instantiated By:	Attribute
Inherits:	Qt3DCore::QNode

List of all members, including inherited members

Public Types

enum	AttributeType { VertexAttribute, IndexAttribute, DrawIndirectAttribute }
enum	VertexBaseType { Byte, UnsignedByte, Short, UnsignedShort, Int, …, Double }

Properties

attributeType : AttributeType
buffer : Qt3DCore::QBuffer*
byteOffset : uint
byteStride : uint
count : uint

divisor : uint
name : QString
vertexBaseType : VertexBaseType
vertexSize : uint

Public Functions

	QAttribute(Qt3DCore::QBuffer *buf, const QString &name, Qt3DCore::QAttribute::VertexBaseType type, uint dataSize, uint count, uint offset = 0, uint stride = 0, Qt3DCore::QNode *parent = nullptr)
	QAttribute(Qt3DCore::QBuffer *buf, Qt3DCore::QAttribute::VertexBaseType type, uint dataSize, uint count, uint offset = 0, uint stride = 0, Qt3DCore::QNode *parent = nullptr)
	QAttribute(Qt3DCore::QNode *parent = nullptr)
Qt3DCore::QAttribute::AttributeType	attributeType() const
Qt3DCore::QBuffer *	buffer() const
uint	byteOffset() const
uint	byteStride() const
uint	count() const
uint	divisor() const
QString	name() const
Qt3DCore::QAttribute::VertexBaseType	vertexBaseType() const
uint	vertexSize() const

Public Slots

void	setAttributeType(Qt3DCore::QAttribute::AttributeType attributeType)
void	setBuffer(Qt3DCore::QBuffer *buffer)
void	setByteOffset(uint byteOffset)
void	setByteStride(uint byteStride)
void	setCount(uint count)
void	setDivisor(uint divisor)
void	setName(const QString &name)
void	setVertexBaseType(Qt3DCore::QAttribute::VertexBaseType type)
void	setVertexSize(uint size)

Signals

void	attributeTypeChanged(Qt3DCore::QAttribute::AttributeType attributeType)
void	bufferChanged(Qt3DCore::QBuffer *buffer)
void	byteOffsetChanged(uint byteOffset)
void	byteStrideChanged(uint byteStride)
void	countChanged(uint count)
void	dataSizeChanged(uint vertexSize)
void	dataTypeChanged(Qt3DCore::QAttribute::VertexBaseType vertexBaseType)
void	divisorChanged(uint divisor)
void	nameChanged(const QString &name)
void	vertexBaseTypeChanged(Qt3DCore::QAttribute::VertexBaseType vertexBaseType)
void	vertexSizeChanged(uint vertexSize)

Static Public Members

QString	defaultColorAttributeName()
QString	defaultJointIndicesAttributeName()
QString	defaultJointWeightsAttributeName()
QString	defaultNormalAttributeName()
QString	defaultPositionAttributeName()
QString	defaultTangentAttributeName()
QString	defaultTextureCoordinate1AttributeName()
QString	defaultTextureCoordinate2AttributeName()
QString	defaultTextureCoordinateAttributeName()

QBufferPtr

Detailed Description

There are 3 types of attributes.

VertexAttribute: used to define data to be read on a per vertex basis
IndexAttribute: used to define vertex indices when indexed draw calls are to be used
DrawIndirectAttribute: used to specify the DrawIndirect buffer to be used when indirect draw calls are to be used

Note: when an attribute is of type DrawIndirectAttribute, only count, stride and offset are relevant.

When providing your own attributes, it may make sense to name your attribute using helpers such as QAttribute::defaultPositionAttributeName() as that will ensure your geometry will be compatible with picking and the various materials provided in the Qt3DExtras module.

See also QBuffer.

Member Type Documentation

enum QAttribute::AttributeType

The type of the attribute.

Constant	Value
`Qt3DCore::QAttribute::VertexAttribute`	`0`
`Qt3DCore::QAttribute::IndexAttribute`	`1`
`Qt3DCore::QAttribute::DrawIndirectAttribute`	`2`

enum QAttribute::VertexBaseType

The type of the data.

Constant	Value
`Qt3DCore::QAttribute::Byte`	`0`
`Qt3DCore::QAttribute::UnsignedByte`	`1`
`Qt3DCore::QAttribute::Short`	`2`
`Qt3DCore::QAttribute::UnsignedShort`	`3`
`Qt3DCore::QAttribute::Int`	`4`
`Qt3DCore::QAttribute::UnsignedInt`	`5`
`Qt3DCore::QAttribute::HalfFloat`	`6`
`Qt3DCore::QAttribute::Float`	`7`
`Qt3DCore::QAttribute::Double`	`8`

Property Documentation

attributeType : AttributeType

Holds the attribute type.

Access functions:

Qt3DCore::QAttribute::AttributeType	attributeType() const
void	setAttributeType(Qt3DCore::QAttribute::AttributeType attributeType)

Notifier signal:

void	attributeTypeChanged(Qt3DCore::QAttribute::AttributeType attributeType)

buffer : Qt3DCore::QBuffer*

Holds the buffer.

Access functions:

Qt3DCore::QBuffer *	buffer() const
void	setBuffer(Qt3DCore::QBuffer *buffer)

Notifier signal:

void	bufferChanged(Qt3DCore::QBuffer *buffer)

byteOffset : uint

Holds the byte offset.

Access functions:

uint	byteOffset() const
void	setByteOffset(uint byteOffset)

Notifier signal:

void	byteOffsetChanged(uint byteOffset)

byteStride : uint

Holds the byte stride.

Access functions:

uint	byteStride() const
void	setByteStride(uint byteStride)

Notifier signal:

void	byteStrideChanged(uint byteStride)

count : uint

Holds the count.

Access functions:

uint	count() const
void	setCount(uint count)

Notifier signal:

void	countChanged(uint count)

divisor : uint

Holds the divisor.

Access functions:

uint	divisor() const
void	setDivisor(uint divisor)

Notifier signal:

void	divisorChanged(uint divisor)

name : QString

Holds the name.

Access functions:

QString	name() const
void	setName(const QString &name)

Notifier signal:

void	nameChanged(const QString &name)

vertexBaseType : VertexBaseType

Holds the data type.

Access functions:

Qt3DCore::QAttribute::VertexBaseType	vertexBaseType() const
void	setVertexBaseType(Qt3DCore::QAttribute::VertexBaseType type)

Notifier signal:

void	vertexBaseTypeChanged(Qt3DCore::QAttribute::VertexBaseType vertexBaseType)

vertexSize : uint

Holds the data size, it can only be 1 to 4 units (scalars and vectors), 9 units (3x3 matrices) or 16 units (4x4 matrices).

Access functions:

uint	vertexSize() const
void	setVertexSize(uint size)

Notifier signal:

void	vertexSizeChanged(uint vertexSize)

Member Function Documentation

QAttribute::QAttribute(Qt3DCore::QBuffer **buf, const QString &name, Qt3DCore::QAttribute::VertexBaseType type, uint dataSize, uint count, uint offset* = 0, uint stride = 0, Qt3DCore::QNode **parent* = nullptr)

Constructs a new QAttribute named name from buf of type, dataSize, count, offset, and stride with parent.

QAttribute::QAttribute(Qt3DCore::QBuffer **buf, Qt3DCore::QAttribute::VertexBaseType type, uint dataSize, uint count, uint offset* = 0, uint stride = 0, Qt3DCore::QNode **parent* = nullptr)

Constructs a new QAttribute from buf of type, dataSize, count, offset, and stride with parent.

QAttribute::QAttribute(Qt3DCore::QNode **parent* = nullptr)

Constructs a new QAttribute with parent.

`[signal]` void QAttribute::dataSizeChanged(uint vertexSize)

The signal is emitted with vertexSize when the dataSize changes.

`[signal]` void QAttribute::dataTypeChanged(Qt3DCore::QAttribute::VertexBaseType vertexBaseType)

The signal is emitted with vertexBaseType when the dataType changed.

`[static invokable]` QString QAttribute::defaultColorAttributeName()

QAttribute::defaultColorAttributeName Returns the name of the default color attribute

Note: This function can be invoked via the meta-object system and from QML. See Q_INVOKABLE.

Note: Getter function for property defaultColorAttributeName.

`[static]` QString QAttribute::defaultJointIndicesAttributeName()

QAttribute::defaultJointIndicesAttributeName Returns the name of the default joint indices attribute

Note: Getter function for property defaultJointIndicesAttributeName.

`[static]` QString QAttribute::defaultJointWeightsAttributeName()

QAttribute::defaultJointIndicesAttributeName Returns the name of the default joint weights attribute

Note: Getter function for property defaultJointWeightsAttributeName.

`[static invokable]` QString QAttribute::defaultNormalAttributeName()

QAttribute::defaultNormalAttributeName Returns the name of the default normal attribute

Note: This function can be invoked via the meta-object system and from QML. See Q_INVOKABLE.

Note: Getter function for property defaultNormalAttributeName.

`[static invokable]` QString QAttribute::defaultPositionAttributeName()

QAttribute::defaultPositionAttributeName Returns the name of the default position attribute

Note: This function can be invoked via the meta-object system and from QML. See Q_INVOKABLE.

Note: Getter function for property defaultPositionAttributeName.

`[static invokable]` QString QAttribute::defaultTangentAttributeName()

QAttribute::defaultTangentAttributeName Returns the name of the default tangent attribute

Note: This function can be invoked via the meta-object system and from QML. See Q_INVOKABLE.

Note: Getter function for property defaultTangentAttributeName.

`[static]` QString QAttribute::defaultTextureCoordinate1AttributeName()

QAttribute::defaultTextureCoordinate1AttributeName Returns the name of the default attribute for the second layer of texture coordinates

Note: Getter function for property defaultTextureCoordinate1AttributeName.

`[static]` QString QAttribute::defaultTextureCoordinate2AttributeName()

QAttribute::defaultTextureCoordinate2AttributeName Returns the name of the default attribute for the third layer of texture coordinates

Note: Getter function for property defaultTextureCoordinate2AttributeName.

`[static invokable]` QString QAttribute::defaultTextureCoordinateAttributeName()

QAttribute::defaultTextureCoordinateAttributeName Returns the name of the default texture coordinate attribute

Note: This function can be invoked via the meta-object system and from QML. See Q_INVOKABLE.

Note: Getter function for property defaultTextureCoordinateAttributeName.

Contents

QAttribute Class

Public Types

Properties

Public Functions

Public Slots

Signals

Static Public Members

Detailed Description

Member Type Documentation

enum QAttribute::AttributeType

enum QAttribute::VertexBaseType

Property Documentation

attributeType : AttributeType

buffer : Qt3DCore::QBuffer*

byteOffset : uint

byteStride : uint

count : uint

divisor : uint

name : QString

vertexBaseType : VertexBaseType

vertexSize : uint

Member Function Documentation

QAttribute::QAttribute(Qt3DCore::QBuffer **buf, const QString &name, Qt3DCore::QAttribute::VertexBaseType type, uint dataSize, uint count, uint offset* = 0, uint stride = 0, Qt3DCore::QNode **parent* = nullptr)

QAttribute::QAttribute(Qt3DCore::QBuffer **buf, Qt3DCore::QAttribute::VertexBaseType type, uint dataSize, uint count, uint offset* = 0, uint stride = 0, Qt3DCore::QNode **parent* = nullptr)

QAttribute::QAttribute(Qt3DCore::QNode **parent* = nullptr)

`[signal]` void QAttribute::dataSizeChanged(uint vertexSize)

`[signal]` void QAttribute::dataTypeChanged(Qt3DCore::QAttribute::VertexBaseType vertexBaseType)

`[static invokable]` QString QAttribute::defaultColorAttributeName()

`[static]` QString QAttribute::defaultJointIndicesAttributeName()

`[static]` QString QAttribute::defaultJointWeightsAttributeName()

`[static invokable]` QString QAttribute::defaultNormalAttributeName()

`[static invokable]` QString QAttribute::defaultPositionAttributeName()

`[static invokable]` QString QAttribute::defaultTangentAttributeName()

`[static]` QString QAttribute::defaultTextureCoordinate1AttributeName()

`[static]` QString QAttribute::defaultTextureCoordinate2AttributeName()

`[static invokable]` QString QAttribute::defaultTextureCoordinateAttributeName()

Related Non-Members

QBufferPtr

Contents

QAttribute Class

Public Types

Properties

Public Functions

Public Slots

Signals

Static Public Members

Related Non-Members

Detailed Description

Member Type Documentation

enum QAttribute::AttributeType

enum QAttribute::VertexBaseType

Property Documentation

attributeType : AttributeType

buffer : Qt3DCore::QBuffer*

byteOffset : uint

byteStride : uint

count : uint

divisor : uint

name : QString

vertexBaseType : VertexBaseType

vertexSize : uint

Member Function Documentation

QAttribute::QAttribute(Qt3DCore::QBuffer *buf, const QString &name, Qt3DCore::QAttribute::VertexBaseType type, uint dataSize, uint count, uint offset = 0, uint stride = 0, Qt3DCore::QNode *parent = nullptr)

QAttribute::QAttribute(Qt3DCore::QBuffer *buf, Qt3DCore::QAttribute::VertexBaseType type, uint dataSize, uint count, uint offset = 0, uint stride = 0, Qt3DCore::QNode *parent = nullptr)

QAttribute::QAttribute(Qt3DCore::QNode *parent = nullptr)

[signal] void QAttribute::dataSizeChanged(uint vertexSize)

[signal] void QAttribute::dataTypeChanged(Qt3DCore::QAttribute::VertexBaseType vertexBaseType)

[static invokable] QString QAttribute::defaultColorAttributeName()

[static] QString QAttribute::defaultJointIndicesAttributeName()

[static] QString QAttribute::defaultJointWeightsAttributeName()

[static invokable] QString QAttribute::defaultNormalAttributeName()

[static invokable] QString QAttribute::defaultPositionAttributeName()

[static invokable] QString QAttribute::defaultTangentAttributeName()

[static] QString QAttribute::defaultTextureCoordinate1AttributeName()

[static] QString QAttribute::defaultTextureCoordinate2AttributeName()

[static invokable] QString QAttribute::defaultTextureCoordinateAttributeName()

Related Non-Members

QBufferPtr

Sign Up and Download for Free

QAttribute::QAttribute(Qt3DCore::QBuffer **buf, const QString &name, Qt3DCore::QAttribute::VertexBaseType type, uint dataSize, uint count, uint offset* = 0, uint stride = 0, Qt3DCore::QNode **parent* = nullptr)

QAttribute::QAttribute(Qt3DCore::QBuffer **buf, Qt3DCore::QAttribute::VertexBaseType type, uint dataSize, uint count, uint offset* = 0, uint stride = 0, Qt3DCore::QNode **parent* = nullptr)

QAttribute::QAttribute(Qt3DCore::QNode **parent* = nullptr)

`[signal]` void QAttribute::dataSizeChanged(uint vertexSize)

`[signal]` void QAttribute::dataTypeChanged(Qt3DCore::QAttribute::VertexBaseType vertexBaseType)

`[static invokable]` QString QAttribute::defaultColorAttributeName()

`[static]` QString QAttribute::defaultJointIndicesAttributeName()

`[static]` QString QAttribute::defaultJointWeightsAttributeName()

`[static invokable]` QString QAttribute::defaultNormalAttributeName()

`[static invokable]` QString QAttribute::defaultPositionAttributeName()

`[static invokable]` QString QAttribute::defaultTangentAttributeName()

`[static]` QString QAttribute::defaultTextureCoordinate1AttributeName()

`[static]` QString QAttribute::defaultTextureCoordinate2AttributeName()

`[static invokable]` QString QAttribute::defaultTextureCoordinateAttributeName()