QSpotLight Class

class Qt3DRender::QSpotLight

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

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

This class was introduced in Qt 5.5.

Public Functions

QSpotLight(Qt3DCore::QNode *parent = nullptr)

Detailed Description

A spotlight is a light source that emits a cone of light in a particular direction.

A spotlight 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

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

Constructs a new QSpotLight with the specified parent.