Calculation and application of interior or exterior normal - vector of 3 - dimension planer elements 三维图形平面单元内外法向量的计算及应用
Nor : uses the direction of the normal vector as coordinates . this is very useful when creating certain special effects ( see below ) 法向:使用法向量的方向作为坐标。这在创建某些特效时非常有用（见下文） 。
A survey of parametric scattered data fitting using triangular interpolants . curve and surface design , h . hagen ed . , springer - verlag , 1992 2在每条边界曲线上指定相应的二次法向量，其与边界曲线的切向量相垂直。
Geometric modelling : algorithms and new trends , g . farin ed . , siam , philadelphia , 1987 , pp . 235 - 246 . 20 loop c . smooth spline surfaces over irregular meshes 3构造拟插值曲面，它覆盖四边或三角域上的曲线网格并部分插值于其上法向量。
In order to get the better effect of showing organ surface , it also gives a new method to compute the normal vector at grid vertex for the drawing part of the system 在系统绘制部分，为了获得更光滑的器官表面显示效果，给出了网格顶点法向量计算的新方法。
We using the triangulation constructed from the point ' s adjacent field , which is the nearest to the original local surface , to compute the point ' s normal . it can get a good result 本文采用了与局部曲面片最接近的由点的邻域所构造的三角片来近似求点的法向量的方法，得到了较好的实验结果。
To realize the illusion of bumpy of geometric surface , traditional bump mapping changes the normals of geometric surface instead of changing the geogetric attributes of body surface 传统的凹凸纹理映射技术并没有真正改变物体表面的几何属性,而是通过纹理来改变物体表面的法向量,从而实现物体表面具有粗糙感的假象。
We use a size changeable adjacent field to describe the topological structure of 3d unorganized points in our algorithm . it can offer essential dynamic information for tessellation and points " normal 算法采用可以控制大小的邻域作为空间散乱数据点的拓扑关系的几何描述，为网格划分和点的法向量的几何描述提供了必要的动态几何信息。
When we get the surface model , we can project the vertex of polygons onto the input images to get the texture on the correspondent pixel and in turn get the texture on the surface model 多边形的法向是该锥体平面的法向量。在得到物体表么网格模型后，可以通过计算该多边形对应于输入图像上的像素获取纹理信息，进而映射得到物体网格平面纹理值。
This algorithm has higher efficient than the method which uses tool path envelope intersection with normal vector of surface of geometry model and has higher verification precise than the method that uses tool path envelope intersection with z direction vectors 其运行效率高于用几何模型法向量与刀具扫掠体求交的方法，验证精度大于用z坐标方向矢量与刀具扫掠体求交的算法。
