unity - lights

unity - lights

just like the real world ,in unity, we use lights to illuminate(照亮) our scenes. without lights nothing would be visible to the camera in our scene. Broadly(广义上) there are two types of lighting in unity, dynamic and baked(烘焙) lighting. 
Dynamic lighting is calculated in real time while our game is running.(当我们运行游戏的时候，动态光是实时进行计算的). This can be achieved simply by adding lights to our scenes.
Baked lighting is calculated offline and saved to a texture. These lighting texture maps are then applied to the baked objects in the scene for improved performance.