?采样级别
4. Sampling level: This parameter is directly affecting the render duration. For example, with a very low sampling level (5) even if your usual render time is 5 hours it will be less than 5 hours with this setting.higher the sample level higer the render quality and better results but with 1 computer it may be really hard to handle the process. Mostly this should be set between 15 and 20.