the prison camp, we actually built it near the vancouver airport in british columbia.surrounded by over 100,000 square feet of green screen. we needed all that screen because we had big wide shots that were set quite low. and beyond this set, we needed to put the sierra nevada mountains. we used a process called photogrammetry, where we went up in a helicopter and shot reference up and down the sierra nevadas in that kind of region. and then we turned those still photographs into three—dimensional geometry using the photogrammetry process. and we were able to use those pieces of geometry sort of like a kit set. and in the kind of traditional model making sense, we were able to take geometry from those mountains, cut them up and then put them together into a way where we could achieve specific compositions that matched what the director was after for that set. we developed this new piece of software called totara. totara is an ecosystem simulator. so, we built the terrain and we sort of map resources. we said, this is where the good soil is, this is where the bad soil i