Was made using the same computer graphics software as the movie sequences in video games.
The film is dedicated posthumously to Richard Harris. He recorded voice work for the film as Opaz, but died of Hodgkin's lymphoma before it was released.
The worlds of Astria and Tallis could not exist in reality, because they are far too close together. Although Opaz calls Tallis the "twin" of Astria, it's clearly smaller. This means it would lie inside the Roche limit of Astria, and the tidal forces exerted by the gravitational force of the larger planet would literally tear it apart. So in reality, the equatorial band of Astria would be covered in gigantic craters and the planet would be surrounded by a debris ring a bit like Saturn. And there would be no Tallis.