Joe Gradecki, The Virtual Reality Construction Kit, John Wiley & Sons, 1994


As you know, to achieve the full sense of immersion, we must be able to manipulate things in the virtual world just as we would manipulate them in our real world. Because manipulation requires movement, we therefore need to be able to move as naturally as possible in the virtual world. Most of the programs developed for the PC have dealt with motion through the keyboard; the racquetball game we developed in the previous chapter was set up so that pressing the F key caused the user to move forward. This is obviously not how we move in the real world.