But in geometry-based rendering systems, the acquistion of realistics surface models is difficult and real-time rendering of complex scenes is computationally expensive.

• 基于图象实时绘制技术是实现对虚拟场景建模和实时绘制的新的有效方法，可以克服传统的基于几何绘制方式中建立真实模型的困难和实时绘制计算量大的缺陷。