QSpotLight Class
class Qt3DRender::QSpotLightEncapsulate a Spot Light object in a Qt 3D scene. More...
Header: | #include <QSpotLight> |
CMake: | find_package(Qt6 REQUIRED COMPONENTS 3drender) target_link_libraries(mytarget PRIVATE Qt6::3drender) |
qmake: | QT += 3drender |
Instantiated By: | SpotLight |
Inherits: | Qt3DRender::QAbstractLight |
Properties
|
|
Public Functions
QSpotLight(Qt3DCore::QNode *parent = nullptr) | |
float | constantAttenuation() const |
float | cutOffAngle() const |
float | linearAttenuation() const |
QVector3D | localDirection() const |
float | quadraticAttenuation() const |
Public Slots
void | setConstantAttenuation(float value) |
void | setCutOffAngle(float cutOffAngle) |
void | setLinearAttenuation(float value) |
void | setLocalDirection(const QVector3D &localDirection) |
void | setQuadraticAttenuation(float value) |
Signals
void | constantAttenuationChanged(float constantAttenuation) |
void | cutOffAngleChanged(float cutOffAngle) |
void | linearAttenuationChanged(float linearAttenuation) |
void | localDirectionChanged(const QVector3D &localDirection) |
void | quadraticAttenuationChanged(float quadraticAttenuation) |
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.
Property Documentation
constantAttenuation : float
Specifies the constant attenuation of the spot light.
Note: The exact meaning and use of this property is up to the material implementation.
Access functions:
float | constantAttenuation() const |
void | setConstantAttenuation(float value) |
Notifier signal:
void | constantAttenuationChanged(float constantAttenuation) |
cutOffAngle : float
Specifies the cut off angle of the spot light.
Note: The exact meaning and use of this property is up to the material implementation.
Access functions:
float | cutOffAngle() const |
void | setCutOffAngle(float cutOffAngle) |
Notifier signal:
void | cutOffAngleChanged(float cutOffAngle) |
linearAttenuation : float
Specifies the linear attenuation of the spot light.
Note: The exact meaning and use of this property is up to the material implementation.
Access functions:
float | linearAttenuation() const |
void | setLinearAttenuation(float value) |
Notifier signal:
void | linearAttenuationChanged(float linearAttenuation) |
localDirection : QVector3D
Specifies the local direction of the spot light.
Note: The exact meaning and use of this property is up to the material implementation.
Access functions:
QVector3D | localDirection() const |
void | setLocalDirection(const QVector3D &localDirection) |
Notifier signal:
void | localDirectionChanged(const QVector3D &localDirection) |
quadraticAttenuation : float
Specifies the quadratic attenuation of the spot light.
Note: The exact meaning and use of this property is up to the material implementation.
Access functions:
float | quadraticAttenuation() const |
void | setQuadraticAttenuation(float value) |
Notifier signal:
void | quadraticAttenuationChanged(float quadraticAttenuation) |
Member Function Documentation
[explicit]
QSpotLight::QSpotLight(Qt3DCore::QNode *parent = nullptr)
Constructs a new QSpotLight with the specified parent.
© 2024 The Qt Company Ltd. Documentation contributions included herein are the copyrights of their respective owners. The documentation provided herein is licensed under the terms of the GNU Free Documentation License version 1.3 as published by the Free Software Foundation. Qt and respective logos are trademarks of The Qt Company Ltd. in Finland and/or other countries worldwide. All other trademarks are property of their respective owners.