应用透射变换作非回转曲面的交线

Application of Perspective Transformation to Find Intersection of No rotationtal Surfaces

针对目前画法几何教材中没有直接有效的方法求非回转曲面上的截交线和相贯线的作图问题，应用透射变换的作图原理，建立空间透视关系，并在平面上进行透射变换。结合典型题例，具体给出了非回转曲面截交线或相贯线的简捷求解方法。

There is no direct method for drawing the intersetion of no rotationtal surfaces in the projective geometry text books. In order to fulfill this requirement, we find an effective approach based on the theory of perspective transformation. Its validity is verified by illustrative examples.