Weaver, who starred as Ellen Ripley in the Alien series, said she was happy not to be in the film, as a possible crossover was "the reason I wanted my character to die in the first place", and thought the concept "sounded awful". Filming and set designs Production began in late 2003 at Barrandov Studios in Prague, Czech Republic, where most of the filming took place. Production designer Richard Bridgland was in charge of sets, props and vehicles, based on early concept art Anderson had created to give a broad direction of how things would look. 25 to 30 life-sized sets were constructed at Barrandov Studios, many of which were interiors of the pyramid. The pyramid's carvings, sculptures, and hieroglyphs were influenced by Egyptian, Cambodian, and Aztec civilisations, while the regular shifting of the pyramid's rooms was meant to evoke a sense of claustrophobia similar to the original Alien film. According to Anderson, if he was to build the sets in Los Angeles they would have cost $20 million. However, in Prague they cost $2 million, an important factor when the film's budget was less than $50 million. Third scale miniatures several meters in height were created to give the film the effect of realism, rather than relying on computer generated imagery (CGI). For the whaling station miniatures and life-sized sets, over 700 bags of artificial snow were used (roughly 15–20 tons). A 4.5-meter miniature of an icebreaker with working lights and a mechanical moving radar was created, costing almost $37,000 and taking 10 weeks to create. Visual effects producer Arthur Windus, claimed miniatures were beneficial in the filming process: "With computer graphics, you need to spend a lot of time making it real. With a miniature, you shoot it and its there." A scale 25-meter miniature of the whaling station was created in several months. It was designed so the model could be collapsed and then reconstructed, which proved beneficial for a six-second shot which required a re-shoot. Effects and creatures Special effects company Amalgamated Dynamics Incorporated (ADI) was hired for the film, having previously worked on Alien 3 and Alien Resurrection. Visual special effects producers Arthur Windus and John Bruno were in charge of the project, which contained 400 effects shots. ADI founders Alec Gillis, Tom Woodruff Jr. and members of their company, began designing costumes, miniatures and effects in June 2003. For five months the creatures were