Recently, as the rapid development of virtual reality and computer graphics, highfidelity, high sense of reality and high intelligence have been three importantcriterions for virtual reality platform, and, to some extent, have leaded the way ofdevelopment of virtual reality applications. To be specific, high fidelity means makingthe surface of3D models highly similar to real world by using proper illuminationalgorithms and tessellation techniques. High sense of reality has two implications. Forone thing, mo...