QPointLight Class

(Qt3DRender::QPointLight)

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

Header:	#include <QPointLight>
qmake:	QT += 3drender
Since:	Qt 5.5
Instantiated By:	PointLight
Inherits:	Qt3DRender::QAbstractLight

This class was introduced in Qt 5.5.

• List of all members, including inherited members

Properties

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

Public Functions

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

Public Slots

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

Signals

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

Detailed Description

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.

Member Function Documentation

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

Constructs a new QPointLight with the specified parent.