Properties
Protected _groundAlbedo
_ground
Albedo: Color = new Color(51, 51, 51, 255)
Protected _resource
_resource: Ambient | null = null
Protected _skyColor
_sky
Color: Color = new Color(51, 128, 204, 1.0)
Protected _skyIllum
_skyIllum: number = Ambient.SKY_ILLUM
场景的环境光照相关信息