The method , firstly , grids the precipitation amount by conicoid , then judges and traces isoline and brings forward a way of how to avoid connection uncertainty of isoline 该方法首先用二次曲面对不规则站点雨量进行格网化，然后在格网上对等雨量点进行判断、追踪以及在追踪过程中如何消除追踪的二义性。
2.
The contents in this course include space right - angle coordinate system , vector ; hood face and its equation , curve and its equation , plane and its equation , beejine and its equation , conicoid 课件的教学内容包括空间直角坐标系、向量、曲面及其方程、空间曲线及其方程、平面及其方程、空间直线及其方程、二次曲面。
3.
The problems include catmull - clark subdivision surfaces ca n ' t precisely represent standard conicoid except paraboloid , and it ca n ' t modify the shape of limited surfaces when the original control mesh be given 如： catmull - clark细分曲面无法精确表示除抛物面外的常规二次曲面；在给定初始控制网格的情况下，难以调整所生成曲面的形状等。
4.
The interface and concrete operations of the prototype system and results of machining features recognition are illustrated by examples , in which there is a typical shaft , a 2 . 5d part without conicoid and a 2 . 5d part with conicoid 分别以一个典型的轴类零件,一个不具有二次曲面的2 . 5维零件,以及一个具有二次曲面的2 . 5维零件为例,介绍了原型系统的界面和加工特征识别的具体过程及识别的最终结果。
5.
As it can be expressed easily by argument equations , we use the conicoid as the criteria of points " classification . based on the point ' s normal and the adjacent field , corresponding to the conicoid equation such as plane , ball and cylinder , we search the points that fit the equation along the adjacent field . using this method , we realized the automatic classification of unorganized points 本文采用了可以比较方便地用参数方程表示的二次曲面作为数据点的分类标准，根据点的法向量以及其邻域结点的各种属性，对应于平面、球面、柱面等二次曲面，依据曲面方程的特点，从起始点开始沿邻域深度优先递归寻找符合方程的数据点，实现了散乱数据点的自动分类。
