With progress of the times and development of computer graphics and computer-aided design, designers not only are acquainted with graphical method and its basic theory, but they are also needed to increase knowledge in digital analogy.

• 随着时代的进步与计算机绘图及辅助设计技术的兴起,工程界要求设计者不仅要掌握图示、图解的基本理论与方法,而且还要求增加数字模拟方面的理论和知识。 二次直纹曲面在大型建筑及土建、水利工程方面经常获得应用,无论是造型的气势,还是构造的巧妙、结构的精密合理等各个方面,都广泛为人称道。