With the 25th anniversary of The Phantom Menace very much on everyone's minds, StarWars.com caught up with John Knoll, one of the key minds behind the huge innovations created to allow George Lucas' vision for Episode I to come to the screen. Here, he delves into the techniques used to bring the Boonta Eve podrace to life. Knoll saw the podracers as moving at 500 miles per hour and subsequently ruled out most traditional techniques, including shooting helicopter plates (“Helicopters can only go about a hundred, 120 miles per hour”), using models (“One of the problems was that that kind of speed, any reasonably scaled model, you would pass through it just instantly”), and matte paintings (“Matte paintings aren't good at communicating travel through an environment, and usually they're used for a fixed perspective”). Still, he had some new tricks up his sleeve. “That really only left one possibility after you eliminate the other possibilities there, and that's, ‘Could we do it with computer graphics?’ At the time, we had never really done photorealistic CG renderings of terrain. We'd done some tricks where we'd taken matte paintings and we'd projected them onto geometry to get some perspective change, and [model maker] Paul Huston and I had been experimenting with that technique of camera projection. So I thought, ‘Well, maybe this is the way to do it.’” As a test, Huston made some models of mushroom-shaped rocks out of foam and plaster, then painted and digitized them. After that, Huston and Knoll moved the models into the ILM parking lot, took photos of them from multiple angles, then superimposed those onto the digital version. It worked. “That gave us something that looked like photography, because it was photography, but it could move in three dimensions. And after, I don't know, four or five weeks working on this, he had a first shot where he had a photograph of a cloudy sky as a backing. We had a simple ground plane that just had little undulations in it, zipping by with a number of these rocks. He took the same rock, replicated it a number of times, and did a shot of us flying through them. It was pretty stunning. I saw the first rendered sequence of that. It felt like something we'd never really seen before — fully synthetic terrain that had a very high level of photographic realism and the speed, most importantly, the kind of speed and control that we were going to need to do the sequence.” [gallery link="file" columns="2" size="large" ids="162155,162156"] The defining moment in the whole process came when Knoll showed the test footage to the Star Wars creator himself. “I talked to Paul about doing this test while we were still in pre-production, and when I got the first render of it, we'd already started shooting. So I got a little eight-millimeter videotape of Paul's test, and I popped it into a video recorder on set and played it back on one of the monitors. That was a really thrilling experience for me," he says. "It showed that, yes, this idea of doing this with, essentially, three-dimensional matte paintings was going to work. And I showed it to George, and he was very excited. That kind of was the proof that, yeah, this is all going to work.” [amazon box="B0D18PNXNL"]