In order to satisfy the request of analysis, display, and memory of the computer ,this type of model must be simplified . Model simplification has a broad foreground in computer animation ,virtual reality and mutual watching etc.

• 为了能满足计算机分析、显示与存储的要求，必须对这类模型进行简化，模型简化在计算机动画、虚拟现实和交互式可视化等计算机应用领域有着广阔的前景。