The visual effects were rendered by half a dozen companies and required a multinational effort, Industrial Light & Magic and Whiskytree from the U.S., and China's BaseFX in Beijing, Original Force in Nanjing, Trouper Visual Effects in Shanghai and CGCG in Taiwan.
Director Raman Hui and producer William Kong have a story planned out through a fourth film. The two told The Hollywood Reporter in February 2018 that they plan to make an animated film after the fourth one which could serve as a potential spin-off.