Evolution relationship between photographic lamp positions

In fact, there are only two positions of photographic lights: 1, which simulates the position of the sun from rising to setting; 2. Help yourself

In the case of 1, no matter how many lights there are and what lights are used, the final effect must be a single main light effect. Therefore, regardless of the ever-changing lamp position, there is only one final equivalent effect, which is to simulate the position of the sun. From 0 degrees to 180 degrees.