Qt3DRender.QSpotLight ¶

概要 ¶

详细描述 ¶

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.

class PySide2.Qt3DRender.Qt3DRender. QSpotLight ( [ parent=None ] ) ¶

param parent

QNode

构造新 QSpotLight with the specified parent .

PySide2.Qt3DRender.Qt3DRender.QSpotLight. constantAttenuation ( ) ¶

返回类型

float

另请参阅

setConstantAttenuation()

PySide2.Qt3DRender.Qt3DRender.QSpotLight. constantAttenuationChanged ( constantAttenuation ) ¶

参数

constantAttenuation – float

PySide2.Qt3DRender.Qt3DRender.QSpotLight. cutOffAngle ( ) ¶

返回类型

float

另请参阅

setCutOffAngle()

PySide2.Qt3DRender.Qt3DRender.QSpotLight. cutOffAngleChanged ( cutOffAngle ) ¶

参数

cutOffAngle – float

PySide2.Qt3DRender.Qt3DRender.QSpotLight. linearAttenuation ( ) ¶

返回类型

float

另请参阅

setLinearAttenuation()

PySide2.Qt3DRender.Qt3DRender.QSpotLight. linearAttenuationChanged ( linearAttenuation ) ¶

参数

linearAttenuation – float

PySide2.Qt3DRender.Qt3DRender.QSpotLight. localDirection ( ) ¶

返回类型

QVector3D

另请参阅

setLocalDirection()

PySide2.Qt3DRender.Qt3DRender.QSpotLight. localDirectionChanged ( localDirection ) ¶

参数

localDirection – QVector3D

PySide2.Qt3DRender.Qt3DRender.QSpotLight. quadraticAttenuation ( ) ¶

返回类型

float

另请参阅

setQuadraticAttenuation()

PySide2.Qt3DRender.Qt3DRender.QSpotLight. quadraticAttenuationChanged ( quadraticAttenuation ) ¶

参数

quadraticAttenuation – float

PySide2.Qt3DRender.Qt3DRender.QSpotLight. setConstantAttenuation ( value ) ¶

参数

value – float

另请参阅

constantAttenuation()

PySide2.Qt3DRender.Qt3DRender.QSpotLight. setCutOffAngle ( cutOffAngle ) ¶

参数

cutOffAngle – float

另请参阅

cutOffAngle()

PySide2.Qt3DRender.Qt3DRender.QSpotLight. setLinearAttenuation ( value ) ¶

参数

value – float

另请参阅

linearAttenuation()

PySide2.Qt3DRender.Qt3DRender.QSpotLight. setLocalDirection ( localDirection ) ¶

参数

localDirection – QVector3D

另请参阅

localDirection()

PySide2.Qt3DRender.Qt3DRender.QSpotLight. setQuadraticAttenuation ( value ) ¶

参数

value – float

另请参阅

quadraticAttenuation()