The VFX breakdown for Olympus Has Fallen action flick is already here. Filming began in Shreveport, Louisiana, in mid-July 2012. Because Olympus Has Fallen was filmed so far from its actual setting of Washington, D.C., the entire production relied heavily upon visual effects, particularly computer-generated imagery. For example, computers created nearly all of the opening sequence in which the First Lady is killed in a car accident, with chroma key green screen technology used to composite the actors into the computer-generated snowy scenery.
For scenes where actors walked in or out of the White House, a first-floor facade and entrance were built; computers added the second floor, roof, and downtown D.C. cityscape. Action scenes with the White House in the background were filmed in open fields and the White House and D.C. were added in post-production.