What is the difference between rain and cloud simulation?

The rain simulation and the cloud simulation differ primarily in the commonality and in the duration of the brightness changes. A raindrop is a short darkening, while a cloud can darken over a longer period of time. Also, with clouds, all LEDs are connected together. If 3-4 LED bars are assigned to the cloud simulation, they all darken together. When it rains, on the other hand, all LED bars produce raindrops independently to support the image of a "chaotic" rain.