evidence: In a climatic sequence, Jack and Julia inside the bubbleship are pursued by drones through an electrical lighting storm. Mayer worked with the film’s aerial unit in Iceland to acquire F65 background plates that served for portions of the chase. Pixomondo created the clouds, storm and illumination mostly using Terragen. "It was very helpful to get the boiling and swirling of the clouds to the right menacing amount," says Mayer. "We added some closeup volumetrics and simulated rain drops for the immediate foreground. The lightning itself was a CG and comp trick."