静态
AmbientLight
AmbientLight: number = 0
静态
DirectionalLight
DirectionalLight: number = 1
静态
HemisphereLight
HemisphereLight: number = 2
静态
PointLight
PointLight: number = 3
静态
RectAreaLight
RectAreaLight: number = 4
静态
SpotLight
SpotLight: number = 5
自定义光源的基类,用于