【摘要】 采用追踪迭代算法求曲面交线时，共点公差ε、交线通近公差δ１和交点优化公差δ２对算法的稳定性、可靠性、拓扑一致性及时间效率均有一定影响。通过分析，明确了使用追踪迭代算法求曲面交线时应注意的问题；并指出，为控制整体误差和提高求交准确性，应设计不同型态参数域中的数据结构。更多还原

【Abstract】 In the parametric surface intersection by using marching iteration algorithm,the common point tolerances,the approaching intersecting line tolerances and the optimum tolerances of the cross point have some effects on the stability,reliability,topologic identity and time efficency of the algorithm.After these effects being analyzed,a few points that must be paid attention when the algonithm is employed in the parametric surface intersection line are pointed out.The tolerances relationship in different parametric region is given which controls the errors for the intersection.更多还原