Pixar movies look so good you know that loads of cutting edge software, mighty powerful hardware and months worth of rendering are the forces at work behind their studio productions, but the ultimate weapon in the Pixar arsenal, or any 3D arsenal for that matter, is math.
This TED Ed talk focuses on how math plays a major role in the creation of a 3D movie, with Pixar Research Lead Tony DeRose demonstrating how math is the major force behind CGI.
If you'd rather see the math at work within Pixar's proprietary software Presto you should head over to GeekTyrant and watch the included bonus video Presto Demonstration at NVIDIA's GTC Conference, which gives us a rare look at how Presto works.