system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: What is the process for creating cgi effects on the scale of something like the battle for Winterfell where there are so many individual moving objects?
gpt
I can think of two techniques that are typically used high character count scenes. 

1. Duplicating actors through a process called **rotoscoping (think copy and paste)** multiple times in the scene. This works best for characters with similar appearances like the Dothraki Horde or the Unsullied.
2. CGI Studios can make use of specific plugins in Maya that can **simulate large groups of people using the same technology to simulate fluids or particles.** This cuts down render time and means that animators don't have to animate each individual person/object. This is particularly useful for something the wights. An example of where this type of technique is used is in war games like Total War.