Variations on IMAX included the 48 frames per second IMAX HD process, which sought to produce smoother, more lifelike motion, while also reducing the blurring of moving objects, by doubling the normal film rate. The IMAX HD system was tested in 1992 at the Canada Pavilion of the Seville Expo '92 with the film "Momentum". Higher production costs, and the high "wear-and-tear" on the prints and projectors, doomed the IMAX HD system, but, not before many theatres had been retrofitted to project at 48 frames, especially in Canada, in order to play "Momentum". In the 1990s theme parks in Thailand, Germany, and Las Vegas used IMAX HD for their Motion Simulator rides. The Disney parks attraction Soarin' Over California features a modification of both IMAX HD and IMAX Dome, projecting in 48 frames per second.