MDLLightType.unknown The type of the light is unknown or has not been initialized. Declarationcase unknown See AlsoConstantsMDLLightType.ambientMDLLightType.directionalMDLLightType.spotMDLLightType.pointMDLLightType.linearMDLLightType.discAreaMDLLightType.rectangularAreaMDLLightType.superEllipticalMDLLightType.photometricMDLLightType.probeMDLLightType.environment