内容

• 公共类型
• 特性
• 公共函数
• 公共槽
• 信号
• 详细描述

QAbstractRayCaster 类

class Qt3DRender ::QAbstractRayCaster

用于在 3D 场景中，投射光线的抽象基类。 更多...

头：	#include <QAbstractRayCaster>
qmake:	QT += 3drender
Since:	Qt 5.11
实例化：	AbstractRayCaster
继承：	Qt3DCore::QComponent
继承者：	Qt3DRender::QRayCaster and Qt3DRender::QScreenRayCaster

该类在 Qt 5.11 引入。

• 所有成员列表，包括继承成员

公共类型

enum	FilterMode { AcceptAnyMatchingLayers, AcceptAllMatchingLayers, DiscardAnyMatchingLayers, DiscardAllMatchingLayers }
enum	RunMode { Continuous, SingleShot }

特性

• filterMode : FilterMode
• hits : const Hits
• runMode : RunMode

公共函数

void	addLayer (Qt3DRender::QLayer * layer )
Qt3DRender::QAbstractRayCaster::FilterMode	filterMode () const
Qt3DRender::QAbstractRayCaster::Hits	hits () const
QVector<Qt3DRender::QLayer *>	layers () const
void	removeLayer (Qt3DRender::QLayer * layer )
Qt3DRender::QAbstractRayCaster::RunMode	runMode () const

公共槽

void	setFilterMode (Qt3DRender::QAbstractRayCaster::FilterMode filterMode )
void	setRunMode (Qt3DRender::QAbstractRayCaster::RunMode runMode )

信号

void	filterModeChanged (Qt3DRender::QAbstractRayCaster::FilterMode filterMode )
void	hitsChanged (const Qt3DRender::QAbstractRayCaster::Hits & hits )
void	runModeChanged (Qt3DRender::QAbstractRayCaster::RunMode runMode )

详细描述

Qt3DRender::QAbstractRayCaster is an abstract base class for casting rays into a 3d scene. Qt3DRender::QAbstractRayCaster can not be directly instantiated, but rather through its subclasses. QAbstractRayCaster specifies common properties for all ray casters, such as run mode and layer handling, while leaving the actual ray casting details to the subclasses.

Ray castings differs from picking (using Qt3DRender::QObjectPicker ) in that it does not require mouse events to trigger.

By default, the instances of Qt3DRender::QAbstractRayCaster are disabled. When enabled, the specified ray will be tested for intersecting objects at every frame. The QAbstractRayCaster::hits property will be updated with the results of the ray casting, even if no objects are found.

Qt3DRender::QPickingSettings can be used to control the ray casting, such as which primitives are tested and how the results are returned.

Furthermore, Qt3DRender::QLayer components can be used to control how entities, or entity sub-graphs, react to ray casting.

注意： Components derived from QAbstractRayCaster should not be shared amount multiple entities.

另请参阅 Qt3DRender::QRayCaster , Qt3DRender::QScreenRayCaster , Qt3DRender::QObjectPicker , Qt3DRender::QPickingSettings ，和 Qt3DRender::QNoPicking .

成员类型文档编制

enum QAbstractRayCaster:: FilterMode

Specifies the rules for selecting entities to test for raycasting.

常量	值	描述
Qt3DRender::QAbstractRayCaster::AcceptAnyMatchingLayers	0	Accept entities that reference one or more QLayer objects added to this QAbstractRayCaster . This is the default
Qt3DRender::QAbstractRayCaster::AcceptAllMatchingLayers	1	Accept entities that reference all the QLayer objects added to this QAbstractRayCaster
Qt3DRender::QAbstractRayCaster::DiscardAnyMatchingLayers	2	Discard entities that reference one or more QLayer objects added to this QAbstractRayCaster
Qt3DRender::QAbstractRayCaster::DiscardAllMatchingLayers	3	Discard entities that reference all QLayer objects added to this QAbstractRayCaster

enum QAbstractRayCaster:: RunMode

This enumeration specifies how often ray casting is performed

常量	值	描述
Qt3DRender::QAbstractRayCaster::Continuous	0	Ray casting is performed at every frame as long as the component is enabled.
Qt3DRender::QAbstractRayCaster::SingleShot	1	Ray casting is done once then the component disables itself. This is the default

特性文档编制

filterMode : FilterMode

Holds the filter mode specifying the entities to select for ray casting tests.

The default value is AcceptMatchingLayers.

访问函数：

Qt3DRender::QAbstractRayCaster::FilterMode	filterMode () const
void	setFilterMode (Qt3DRender::QAbstractRayCaster::FilterMode filterMode )

通知程序信号：

void	filterModeChanged (Qt3DRender::QAbstractRayCaster::FilterMode filterMode )

hits : const Hits

Holds the results of last ray casting test as a vector of Qt3DRender::QRayCasterHit 实例。

Note that even if successive tests return the exact same results (or empty results), a change notification will be emitted at every test.

访问函数：

Qt3DRender::QAbstractRayCaster::Hits

hits () const

通知程序信号：

void	hitsChanged (const Qt3DRender::QAbstractRayCaster::Hits & hits )

runMode : RunMode

Holds the run mode controlling how often ray casting tests are performed.

若设为 SingleShot (the default), when the component is enabled, a single ray casting test will be performed and the component will automatically disable itself.

If set to Continuous, ray casting tests will be performed at every frame as long as the component is enabled.

访问函数：

Qt3DRender::QAbstractRayCaster::RunMode	runMode () const
void	setRunMode (Qt3DRender::QAbstractRayCaster::RunMode runMode )

通知程序信号：

void	runModeChanged (Qt3DRender::QAbstractRayCaster::RunMode runMode )

成员函数文档编制

void QAbstractRayCaster:: addLayer ( Qt3DRender::QLayer * layer )

Add layer to the current list of layers

QVector < Qt3DRender::QLayer *> QAbstractRayCaster:: layers () const

Returns the current list of layers

void QAbstractRayCaster:: removeLayer ( Qt3DRender::QLayer * layer )

移除 layer from the current list of layers