有四个等边三角形面的四面体。
通过分析该算法的几何原理，构建三角形面片的权值计算公式。
Firstly, the weight's calculation formula of triangle patches is constructed by analyzing its geometric theory.
与导体目标一样，先建立介质目标的几何模型，然后用三角形面元模拟介质表面。
As well as the conducting target, the geometrical model of the dielectric target should first be built, then triangular patches are used to model the surface of the dielectric target.
运用基于块和三角形面片的混合裁剪模式，结合简化的高度差投影计算方法，快速选取适合的地形节点；
Hybrid culling technique based on blocks and triangle faces and simplified computing method for screen-space errors are employed to select appropriate terrain nodes rapidly.
观察上面这个形状相同的网格体：156个三角形面片（右）和726个三角形面片（左）。 726个面片可能听起来不会是很多的多边形，但如果这是在关卡中变成40倍，你会真正开始看到优化后节省下来的面片。
Observe the same shape mesh : 156 triangles (right) vs 726 (left). 726 may not sound like a great deal of polygons, but if this is used 40 times in a level, you will really start to see the savings.
一面通常是三角形的帆，安装在帆船的前桅支索或前支索上。
A usually triangular sail attached to the forestay or headstay of a sailboat.
一个十面体的面具有六个相等的正方形和八个相等的正三角形。
A cuboctahedron has as faces six equal squares and eight equal regular triangles.
每一个面是正三角形并且于每一个顶点处有三个面相交。
Each face is an equilateral triangle and three faces meet at each vertex.
一个三角形有三面，而它是一面。
房子的四面都装有玻璃窗，三角形的或长方形的，为室内提供了充足的光线。
House with Windows on all four sides, triangular or rectangular, to provide ample interior light.
在经过高应力三角形波实验的软回收样品上，发现了两个层裂面。
Two spall planes were observed in the soft recovered sample for the high stress triangular wave experiment.
利用该软件，可生成三维八节点六面体单元，同时也可生成二维三角形和四边形单元。
Hexhedral element for three dimensional parts and triangle and quadrilateral mesh for two dimensional parts can be generated.
因此在空间中是一个三角形，空间中是一个四面体，等等。
给定两个欲合并的网格，先由它们的边界三角形构造一条缝合线，再以该缝合线为骨架构造连接这两个网格的缝合面。
Given a two meshes which want to be merged, we firstly construct a stitch line derived from their fringe triangles, and then create stitch faces which adhere to this stitch line to connect them.
朝船头那面开有一个三角形的出入口，因此，在里边的人可以一览无遗地凭眺前面的景色。
A triangular opening faced towards the bows of the ship, so that the insider commanded a complete view forward.
山形墙的三角形壁面，即山形墙壁面，常有雕刻装饰。
The pediment's triangular wall surface, or tympanum, was often decorated with sculpture.
介绍了一种针对用三角形网面表示的不规则物体的碰撞检测中接触点，接触法线和刺穿深度的计算方法。
This paper introduces a method for calculating the contact point, contact normal and penetration depth in collision detection of irregular objects expressed by triangle mesh.
在晶体中观察到多个层错和一个由两个层错三角形组成的层错四面体。
Several stacking faults and a tetrahedron composed of two stacking faults in triangular were observed within the crystal.
相对于三角形网格，四面体网格质量差的单元所占的比例更大、严重变形的单元更多。
Compared with triangular meshes, tetrahedral meshes tend to have a larger proportion of poor quality elements and to have elements that are more severely distorted.
而采用直角三角形法、换面法和旋转法求出一般位置直线的实长对于提高工作效率和数据的准确度有着重要的意义。
The essay recommends three ways of assessing the substantial length of straight line in average positions, which turned out significance in improving efficiency and precision of data.
均质区域可用泰森三角形、趋势面、聚类分析等方法进行区划；
Regions consist of equal region and nub region and equal region can be divided with the methods of Taisen triangle, trend surface, clustering and so on;
采用推进阵面法生成三角形非结构网格，用多重网格技术求解泊桑方程以取得结构背景网格。
Computational unstructured grid is generated by advancing front method, and the structured background gird is obtained by using multigrid technique to solve the Poisson equation.
另一方面，对裂隙单元进行三角形单元的有限元网格划分，运用变分原理导出裂隙单元的渗流有限元求解方程。
On the other hand, the fracture elements are discretized into triangular mesh, and the flow finite element equations are derived based on the variational principle.
另一方面通过分析知识交流网络中的“用户三角形”，揭示了虚拟社区中知识传播的两种基本图式。
Then find out the two important motifs in knowledge communication through analyzing the triangle of the network.
在煤层三角形区域内布置回采工作面，利用工程数学，优化工作面设计，最大限度地回采煤炭。
Assign face scope at triangle coal seams, make use of engineering mathematics, optimize face designs to mine coals to the maximum.
并对其生成的表面几何模型所包含三角面片数量巨大的问题，提出一种快速有效的三角形边收缩算法进行网格简化，提高了表面模型的绘制速度。
Because 3D surface model contains huge number of triangles, a mesh simplification algorithm based on triangle edges shrinkages is presented in this paper to speed up the rendering in real time.
细分曲面算法通常采用三角形、四角形面片，最近基于六角形面片的细分算法成为研究的热点。
Subdivision surface algorithms usually use triangular or quadrilateral meshes. Recently, the hexagonal subdivision algorithm becomes the focus of research.
国土大致呈三角形，除位于城东南的圣彼得广场外，三面都有城墙环绕。
Peter's Square in the city of the southeast, the three sides are surrounded by walls.
国土大致呈三角形，除位于城东南的圣彼得广场外，三面都有城墙环绕。
Peter's Square in the city of the southeast, the three sides are surrounded by walls.
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