Creating and Drawing Objects

Conceptually, ePiX builds a 3-dimensional virtual ``world'', then photographs the world on a 2-dimensional ``screen''. The screen contains the bounding box, which is affinely scaled to a L^ATEX picture environment. By default, the screen is the $(x_1,x_2)$-plane and the world is renderd by looking straight down the $x_3$-axis.