QPointLight Class▲
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Header: QPointLight
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Since: Qt 5.5
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CMake:
find_package(Qt6 REQUIRED COMPONENTS 3drender)
target_link_libraries(mytarget PRIVATE Qt6::3drender)
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qmake: QT += 3drender
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Inherited By:
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Instantiated By: qml-qt3d-render-pointlight.xml
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Inherits: Qt3DRender::QAbstractLight
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.
Property Documentation▲
constantAttenuation : float▲
Specifies the constant attenuation of the point light.
The exact meaning and use of this property is up to the material implementation.
Access functions:
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float constantAttenuation() const
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void setConstantAttenuation(float value)
Notifier signal:
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void constantAttenuationChanged(float constantAttenuation)
linearAttenuation : float▲
Specifies the linear attenuation of the point light.
The exact meaning and use of this property is up to the material implementation.
Access functions:
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float linearAttenuation() const
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void setLinearAttenuation(float value)
Notifier signal:
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void linearAttenuationChanged(float linearAttenuation)
quadraticAttenuation : float▲
Specifies the quadratic attenuation of the point light.
The exact meaning and use of this property is up to the material implementation.
Access functions:
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float quadraticAttenuation() const
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void setQuadraticAttenuation(float value)
Notifier signal:
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void quadraticAttenuationChanged(float quadraticAttenuation)
Member Function Documentation▲
[explicit] QPointLight::QPointLight(Qt3DCore::QNode *parent = nullptr)▲
Constructs a new QPointLight with the specified parent.