QPointLight Class

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

该类在 Qt 5.5 引入。

所有成员列表，包括继承成员

特性

constantAttenuation : float
linearAttenuation : float
quadraticAttenuation : float

公共函数

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

公共槽

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

信号

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

详细描述

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.

注意： The exact meaning and use of this property is up to the material implementation.

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.

注意： The exact meaning and use of this property is up to the material implementation.

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.

注意： The exact meaning and use of this property is up to the material implementation.

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)

Constructs a new QPointLight with the specified parent .