Qt3DRender.QPointLight ¶

概要 ¶

详细描述 ¶

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.

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

param parent

QNode

构造新 QPointLight with the specified parent .

PySide2.Qt3DRender.Qt3DRender.QPointLight. constantAttenuation ( ) ¶

返回类型

float

另请参阅

setConstantAttenuation()

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

参数

constantAttenuation – float

PySide2.Qt3DRender.Qt3DRender.QPointLight. linearAttenuation ( ) ¶

返回类型

float

另请参阅

setLinearAttenuation()

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

参数

linearAttenuation – float

PySide2.Qt3DRender.Qt3DRender.QPointLight. quadraticAttenuation ( ) ¶

返回类型

float

另请参阅

setQuadraticAttenuation()

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

参数

quadraticAttenuation – float

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

参数

value – float

另请参阅

constantAttenuation()

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

参数

value – float

另请参阅

linearAttenuation()

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

参数

value – float

另请参阅

quadraticAttenuation()