How did the film maker make the movie King Kong incredibly real especially in the end?

Hi pp,


Perhaps you have watched or seen King Kong 2005 which is largely admired as a movie wonder. I wonder how could the film maker make it as unbelievably real as nature in the end of it when the gorilla was doing the riot and stampede in the city, particularly many buildings and vehicles were unmistakably seen being destroyed. By what techniques did the film maker use to do that?|||They used CGI (computer generated imagery) like


they did in Avatar|||I think it is Virtual techniques, which will be hot in the future