查询词典 surface patch

NURBS has become a representation standard for geometric design systems since 1990.However, it is difficult to model complicated objects with only one NURBS surface patch due to its rectangular domain, and it still suffers from serious limitations in surface stitching.

九十年代以来，NURBS曲线曲面已经成为计算机辅助设计系统的表示标准，由于NURBS曲面定义在矩形域上，难以直接用一张NURBS曲面来整体表示复杂曲面，需要采用分片构造的方法才能达到目的，使得拼接边界处的光滑性也受到了严重限制。

By anchoring an imaginary spring between each data point and deformable curve or surface, the fairing model is established. Then FEM is used to solve the deformation problem of the model caused by imaginary springs and a bicubic B-spline surface patch is taken as one element. Lastly the B-spline active surface model is applied to surface reconstruction from layer data and the problem resulted from fitting for uneven cross-sectional curves can be solved.

通过在数据点与模型之间连接虚拟弹簧，建立光顺模型，并以双三次B样条曲面片作为单元，运用有限元法对模型在虚拟弹簧作用下的变形问题进行求解，得到光顺后的B样条曲面；并在此基础上，提出了一种新的基于断层数据的表面重建方法，可很好地解决不均匀截面族的曲面生成问题。

The adhesion region between two adjacent teeth on the 3D dental model is first detected by exploiting the minimum principal curvature information. Then, the adhesion region is cut off and the tooth profile opening caused by the removal of the adhesion region is filled with triangular patches adopting a local optimization scheme, it is then refined to form an intermediate restoration surface patch. The final restoration result is obtained by minimizing the surface energy to reflect the bio-characteristics of the single tooth.

根据三维牙颌模型的形态特征，采用基于曲面最小主曲率的方法对粘连区域进行准确的检测提取；对删除齿间粘连区域后生成的齿间开口利用局部最优化权值规则进行剖分并细分优化，生成"中间"恢复曲面；根据牙齿的生理医学特征，以齿间开口的边界信息为约束条件，采用基于最小化曲面能量函数的方法对"中间"恢复曲面进行变形调整，实现单颗牙齿缺失形状的准确恢复。

In addition, surface profile error evaluation for a surface patch from the front longeron soleplate's geometric model was calculated. Its results show that the algorithms presented have some advantages of feasibility, credibility and good convergence.

此外，对前纵梁底板的一曲面片完成了其曲面轮廓度评定的计算，结果表明，本文提出的方法具有可行、可靠和收敛性好的优点。

Surface curvature is used to estimate the geometrical parameters of the surface patch and give qualitative analysis on surface patch.

利用曲率从深度图象中提取出表面的几何参数，对表面作出定量分析。

Patch fits a surface through contour curves and point objects.

patch命令适合用来制作穿过等高线和点的曲面。

For the data-storage of the surface, the data of the Surface, Patch and Vertex have been stored by using the grid-frame formed by three chain-table. So the lookup of the data is easy and the redundancy of the storage is small.

曲面的数据存储，分别用了三个链表形成的网状结构来存储曲面、网格平面片和顶点的数据，这种结构便于数据的查寻，并且存储冗余小。

Create a terrain surface from contour curves using patch.

使用patch命令，从等高线建立一个地貌曲面。

Secondly, the initial stitching surface patch is subdivided and deformed to reconstruct an optimized surface patch according to the bio-characteristics of the teeth.

该算法首先采用由局部最优化权值驱动的虚拟拉链，对修复体腔的底表面和上表面边界进行拉合，得到对应的初始缝合曲面片。

Firstly, the quadric surface with three points which doesn't on one line is fitted, and then the tangent plane of this fitting surface is got. Meanwhile, the random tangent plane of surface patch subdivided is got also. Finally, the distance can be obtained through iteration between two tangent planes.

首先对点云数据中邻域不在同一直线的三个点进行局部二次曲面拟合，并求取该拟合曲面的切平面，同时求得细分曲面片任意一点处的切平面，最后在两个切平面上进行点对迭代运算，得到点到曲面片的最短距离。

I didn't watch TV last night, because it .

昨晚我没有看电视，因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来，在北京的很多小区里，电梯液晶电视被撤了下来。