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  5. Qt3DRender
  6. QPickingSettings

QPickingSettings Class

class Qt3DRender ::QPickingSettings

The QPickingSettings class specifies how entity picking is handled. 更多...

头： #include <QPickingSettings>
CMake: find_package(Qt6 REQUIRED COMPONENTS 3drender)
target_link_libraries(mytarget PRIVATE Qt6::3drender)
qmake: QT += 3drender
实例化： PickingSettings
继承： Qt3DCore::QNode

公共类型

enum FaceOrientationPickingMode { FrontFace, BackFace, FrontAndBackFace }
enum PickMethod { BoundingVolumePicking, TrianglePicking, LinePicking, PointPicking, PrimitivePicking }
enum PickResultMode { NearestPick, AllPicks, NearestPriorityPick }

特性

公共函数

Qt3DRender::QPickingSettings::FaceOrientationPickingMode faceOrientationPickingMode () const
Qt3DRender::QPickingSettings::PickMethod pickMethod () const
Qt3DRender::QPickingSettings::PickResultMode pickResultMode () const
float worldSpaceTolerance () const

公共槽

void setFaceOrientationPickingMode (Qt3DRender::QPickingSettings::FaceOrientationPickingMode faceOrientationPickingMode )
void setPickMethod (Qt3DRender::QPickingSettings::PickMethod pickMethod )
void setPickResultMode (Qt3DRender::QPickingSettings::PickResultMode pickResultMode )
void setWorldSpaceTolerance (float worldSpaceTolerance )

信号

void faceOrientationPickingModeChanged (QPickingSettings::FaceOrientationPickingMode faceOrientationPickingMode )
void pickMethodChanged (QPickingSettings::PickMethod pickMethod )
void pickResultModeChanged (QPickingSettings::PickResultMode pickResult )
void worldSpaceToleranceChanged (float worldSpaceTolerance )

详细描述

The picking settings determine how the entity picking is handled. For more details about entity picking, see QObjectPicker and QRayCaster component documentation.

当使用 QObjectPicker components, picking is triggered by mouse events.

当使用 QRayCaster or QScreenRayCaster components, picking can be explicitly triggered by the application.

In both cases, a ray will be cast through the scene to find geometry intersecting the ray.

另请参阅 QObjectPicker , QPickEvent , QPickTriangleEvent , QRayCaster ，和 QScreenRayCaster .

成员类型文档编制

enum QPickingSettings:: FaceOrientationPickingMode

Specifies how face orientation affects triangle picking

常量 值 描述
Qt3DRender::QPickingSettings::FrontFace 0x01 Only front-facing triangles will be picked (default).
Qt3DRender::QPickingSettings::BackFace 0x02 Only back-facing triangles will be picked.
Qt3DRender::QPickingSettings::FrontAndBackFace 0x03 Both front- and back-facing triangles will be picked.

enum QPickingSettings:: PickMethod

Specifies the picking method.

常量 值 描述
Qt3DRender::QPickingSettings::BoundingVolumePicking 0x00 An entity is considered picked if the picking ray intersects the bounding volume of the entity (default).
Qt3DRender::QPickingSettings::TrianglePicking 0x01 An entity is considered picked if the picking ray intersects with any triangle of the entity's mesh component.
Qt3DRender::QPickingSettings::LinePicking 0x02 An entity is considered picked if the picking ray intersects with any edge of the entity's mesh component.
Qt3DRender::QPickingSettings::PointPicking 0x04 An entity is considered picked if the picking ray intersects with any point of the entity's mesh component.
Qt3DRender::QPickingSettings::PrimitivePicking TrianglePicking | LinePicking | PointPicking An entity is considered picked if the picking ray intersects with any point, edge or triangle of the entity's mesh component.

enum QPickingSettings:: PickResultMode

Specifies what is included into the picking results.

常量 值 描述
Qt3DRender::QPickingSettings::NearestPick 0 Only the nearest entity to picking ray origin intersected by the picking ray is picked (default).
Qt3DRender::QPickingSettings::AllPicks 1 All entities that intersect the picking ray are picked.
Qt3DRender::QPickingSettings::NearestPriorityPick 2 Selects the entity whose object picker has the highest value. If several object pickers have the same priority, the closest one on the ray is selected.

另请参阅 Qt3DRender::QPickEvent .

特性文档编制

faceOrientationPickingMode : FaceOrientationPickingMode

Specifies how face orientation affects triangle picking

访问函数：

Qt3DRender::QPickingSettings::FaceOrientationPickingMode faceOrientationPickingMode () const
void setFaceOrientationPickingMode (Qt3DRender::QPickingSettings::FaceOrientationPickingMode faceOrientationPickingMode )

通知程序信号：

void faceOrientationPickingModeChanged (QPickingSettings::FaceOrientationPickingMode faceOrientationPickingMode )

pickMethod : PickMethod

Holds the current pick method.

By default, for performance reasons, ray casting will use bounding volume picking. This may however lead to unexpected results if a small object is englobed in the bounding sphere of a large object behind it.

Triangle picking will produce exact results but is computationally more expensive.

访问函数：

Qt3DRender::QPickingSettings::PickMethod pickMethod () const
void setPickMethod (Qt3DRender::QPickingSettings::PickMethod pickMethod )

通知程序信号：

void pickMethodChanged (QPickingSettings::PickMethod pickMethod )

pickResultMode : PickResultMode

Holds the current pick results mode.

By default, pick results will only be produced for the entity closest to the camera.

When setting the pick method to AllPicks , events will be triggered for all the entities with a QObjectPicker along the ray.

When setting the pick method to NearestPriorityPick , events will be triggered for the nearest highest priority picker. This can be used when a given element should always be selected even if others are in front of it.

若 QObjectPicker is assigned to an entity with multiple children, an event will be triggered for each child entity that intersects the ray.

访问函数：

Qt3DRender::QPickingSettings::PickResultMode pickResultMode () const
void setPickResultMode (Qt3DRender::QPickingSettings::PickResultMode pickResultMode )

通知程序信号：

void pickResultModeChanged (QPickingSettings::PickResultMode pickResult )

worldSpaceTolerance : float

Holds the threshold, in model space coordinates, used to evaluate line and point picking.

访问函数：

float worldSpaceTolerance () const
void setWorldSpaceTolerance (float worldSpaceTolerance )

通知程序信号：

void worldSpaceToleranceChanged (float worldSpaceTolerance )

成员函数文档编制

[slot] void QPickingSettings:: setWorldSpaceTolerance ( float worldSpaceTolerance )

Sets the threshold used for line and point picking to worldSpaceTolerance .

注意： setter 函数对于特性 worldSpaceTolerance .

另请参阅 worldSpaceTolerance ().

float QPickingSettings:: worldSpaceTolerance () const

Returns the line and point precision worldSpaceTolerance

注意： Getter function for property worldSpaceTolerance.

另请参阅 setWorldSpaceTolerance ().

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