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 |
Properties
- constantAttenuation : float
- linearAttenuation : float
- quadraticAttenuation : float
- 3 properties inherited from Qt3DRender::QAbstractLight
- 1 property inherited from Qt3DCore::QComponent
- 3 properties inherited from Qt3DCore::QNode
- 1 property inherited from QObject
Public Functions
| QPointLight(Qt3DCore::QNode *parent = nullptr) | |
| float | constantAttenuation() const |
| float | linearAttenuation() const |
| float | quadraticAttenuation() const |
- 3 public functions inherited from Qt3DRender::QAbstractLight
- 2 public functions inherited from Qt3DCore::QComponent
- 13 public functions inherited from Qt3DCore::QNode
- 31 public functions inherited from QObject
Public Slots
| void | setConstantAttenuation(float value) |
| void | setLinearAttenuation(float value) |
| void | setQuadraticAttenuation(float value) |
- 2 public slots inherited from Qt3DRender::QAbstractLight
- 1 public slot inherited from Qt3DCore::QComponent
- 3 public slots inherited from Qt3DCore::QNode
- 1 public slot inherited from QObject
Signals
| void | constantAttenuationChanged(float constantAttenuation) |
| void | linearAttenuationChanged(float linearAttenuation) |
| void | quadraticAttenuationChanged(float quadraticAttenuation) |
- 2 signals inherited from Qt3DRender::QAbstractLight
- 3 signals inherited from Qt3DCore::QComponent
- 4 signals inherited from Qt3DCore::QNode
- 2 signals inherited from QObject
Static Public Members
| const QMetaObject | staticMetaObject |
- 9 static public members inherited from QObject
Additional Inherited Members
- 2 protected functions inherited from Qt3DCore::QNode
- 9 protected functions inherited from QObject
Detailed Description
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.
Property Documentation
constantAttenuation : float
Specifies the constant attenuation of the point light
Access functions:
| float | constantAttenuation() const |
| void | setConstantAttenuation(float value) |
Notifier signal:
| void | constantAttenuationChanged(float constantAttenuation) |
linearAttenuation : float
Specifies the linear attenuation of the point light
Access functions:
| float | linearAttenuation() const |
| void | setLinearAttenuation(float value) |
Notifier signal:
| void | linearAttenuationChanged(float linearAttenuation) |
quadraticAttenuation : float
Specifies the quadratic attenuation of the point light
Access functions:
| float | quadraticAttenuation() const |
| void | setQuadraticAttenuation(float value) |
Notifier signal:
| void | quadraticAttenuationChanged(float quadraticAttenuation) |
Member Function Documentation
QPointLight::QPointLight(Qt3DCore::QNode *parent = nullptr)
Constructs a new QPointLight with the specified parent.
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