Lightmass ignores StaticSwitch in materialinstance

	virtual void GetStaticParameterSet(EShaderPlatform Platform, FStaticParameterSet& OutSet) const override
	{
		FMaterial::GetStaticParameterSet(Platform, OutSet);

		// Get the set from instance
		UMaterialInstance *MaterialInstance = Cast<UMaterialInstance>(MaterialInterface);
		if (MaterialInstance)
		{
			MaterialInstance->GetStaticParameterValues(OutSet);
		}	
	}