| 1. | Attenuation values are ignored for directional lights
对于定向光线，忽略衰减值。 |
| 2. | A very good example of directional light is sun light
一个比较好的例子就是太阳光。 |
| 3. | Directional lighting direction light infinite light
方向性照明平行光平均光源方向光 |
| 4. | If directional lights are supported ; otherwise ,
如果支持方向性光源，则为 |
| 5. | This member does not affect directional lights
此成员不影响定向光线。 |
| 6. | Specifies whether directional lights are supported on a device
指定设备上是否支持方向性光源。 |
| 7. | This member has meaning only for directional light and spotlights
此成员只对定向光线和聚光灯有意义。 |
| 8. | Directional light : this light has only direction ( orientation ) and color
方向光：此类光具有方向及颜色。 |
| 9. | For non - directional lights , all three attenuation values should not be set to 0 . 0 simultaneously
对于非定向光线，全部三个衰减值不应同时设置为0 . 0 。 |
| 10. | For non - directional lights , avoid setting all three attenuation values to 0 . 0 simultaneously
对于无方向性光线，应避免将全部三个衰减值同时设置为0 . 0 。 |
