内容

• 特性
• 公共函数
• 公共槽
• 信号
• 静态公共成员
• 详细描述

QPointLight Class

( Qt3DRender::QPointLight )

Encapsulate a Point Light object in a Qt 3D scene. 更多...

头：	#include <QPointLight>
qmake:	QT += 3drender
Since:	Qt 5.5
实例化：	PointLight
继承：	Qt3DRender::QAbstractLight

• 所有成员列表，包括继承成员
• 过时成员

特性

• constantAttenuation : float
• linearAttenuation : float
• quadraticAttenuation : float

• 3 特性继承自 Qt3DRender::QAbstractLight
• 1 特性继承自 Qt3DCore::QComponent
• 3 特性继承自 Qt3DCore::QNode
• 1 特性继承自 QObject

公共函数

	QPointLight (Qt3DCore::QNode * parent = nullptr)
float	constantAttenuation () const
float	linearAttenuation () const
float	quadraticAttenuation () const

• 3 公共函数继承自 Qt3DRender::QAbstractLight
• 2 公共函数继承自 Qt3DCore::QComponent
• 13 公共函数继承自 Qt3DCore::QNode
• 31 公共函数继承自 QObject

公共槽

void	setConstantAttenuation (float value )
void	setLinearAttenuation (float value )
void	setQuadraticAttenuation (float value )

• 2 公共槽继承自 Qt3DRender::QAbstractLight
• 1 公共槽继承自 Qt3DCore::QComponent
• 3 公共槽继承自 Qt3DCore::QNode
• 1 公共槽继承自 QObject

信号

void	constantAttenuationChanged (float constantAttenuation )
void	linearAttenuationChanged (float linearAttenuation )
void	quadraticAttenuationChanged (float quadraticAttenuation )

• 2 信号继承自 Qt3DRender::QAbstractLight
• 3 信号继承自 Qt3DCore::QComponent
• 4 信号继承自 Qt3DCore::QNode
• 2 信号继承自 QObject

静态公共成员

const QMetaObject

staticMetaObject

• 9 静态公共成员继承自 QObject

额外继承成员

• 2 保护函数继承自 Qt3DCore::QNode
• 9 保护函数继承自 QObject

详细描述

Encapsulate a Point Light object in a Qt 3D scene.

A point light is a light source that emits light in all directions, from a single point. Conceptually, this is similar to light given off by a standard light bulb.

A point light uses three attenuation factors to describe how the intensity of the light decreases over distance. These factors are designed to be used together in calcuating total attenuation. For the materials in Qt3D Extras the following formula is used, where distance is the distance from the light to the surface being rendered:

totalAttenuation = 1.0 / (constantAttenuation + (linearAttenuation * distance) + (quadraticAttenuation * distance * distance));
					

Custom materials may choose to interpret these factors differently.

特性文档编制

constantAttenuation : float

Specifies the constant attenuation of the point light

访问函数：

float	constantAttenuation () const
void	setConstantAttenuation (float value )

通知程序信号：

void	constantAttenuationChanged (float constantAttenuation )

linearAttenuation : float

Specifies the linear attenuation of the point light

访问函数：

float	linearAttenuation () const
void	setLinearAttenuation (float value )

通知程序信号：

void	linearAttenuationChanged (float linearAttenuation )

quadraticAttenuation : float

Specifies the quadratic attenuation of the point light

访问函数：

float	quadraticAttenuation () const
void	setQuadraticAttenuation (float value )

通知程序信号：

void	quadraticAttenuationChanged (float quadraticAttenuation )

成员函数文档编制

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

构造新的 QPointLight 采用指定 parent .