Special effects supervisor John Dykstra pioneered a new technique for shooting the complex flying sequences, called reverse blue-screen photography. This involved coating the model with phosphorus paint and photographing it first with strong lighting against a black background and then with ultraviolet light to create the necessary male and female mattes to separate the foreground model and the background footage. This enabled the shiny black model to be photographed flying against a clear blue sky and gleaming white snow; compare this with traditional bluescreen technique used in "The Empire Strikes Back." The original scale model made by Gregory Jein used in the bluescreen work is now on display at the Warner Bros. Museum.