mesh n. 1.网眼;筛孔;〔pl.〕网,网状物,网络;网丝;铜纱;〔pl.〕法网。 2.【机械工程】(齿轮的)啮合。 a 60 mesh screen (每英寸有)60孔的筛子。 a net with half-inch meshes 半英寸孔的网。 vt. 1.用网捕;使缠住。 2.【机械工程】(使)咬合,钩住 (with)。 3.编[织]网;使成网状。 mesh a net 编网。 vi. 1.被网住,落网。 2.紧密配合;【机械工程】互相啮合 (with)。 be caught in meshes of the law 陷入法网。 be in mesh (齿轮)互相咬住。
The model used to control mesh deforming is improved spring analogy with boundary improvement and torsional effect improvement 网格变形的物理模型采用改进的弹簧近似模型,改进措施包括边界修正和扭转效应修正。
Based on theory of spline surface offset, the first one directly finds the control polygon mesh of the offset surface from the original control mesh 第一种算法依据样条曲面等距原理,把对细分曲面的等距转化为其等距前后控制网格的对应关系。
Subdivision surface is a new geometric modeling technology of discrete surface based on mesh . it can express modeling surface through control mesh and subdivision rules 细分曲面是基于网格的离散曲面造型新技术,它通过定义控制网格和细分规则来表示造型曲面。
Two different methods for interference checking have been developed . quick feasibility checking is used to find a conservative feasible tool orientation by using the control mesh of a sculptured surface 在干涉检测中用了两种不同的算法,即快速检测法和详细检测法,快速检测法通过使用曲面的控制网格获得刀具的可行位置。
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。
Both of them decrease the size of control mesh evidently, and meanwhile the quality of subdivision surface is guaranteed . all these save lots of time and space for successive storage, transmission and modification 可以在保证所需细分质量前提下,使得表示细分曲面的控制网格上的几何元素的数量明显下降,从而为细分曲面的后续处理、存储、传输节约了大量的时间和空间。
According to topological structure of control mesh, we generate generalized rational parametric surfaces in two manners . for a control mesh with consistent parameterization, the surface can be easily constructed because it can be mapped to differential manifold directly 对于具有简单拓扑结构,存在着一致的全局参数化的控制网格,我们将把控制网格直接映射到微分流形上,因此可以很容易地对曲面进行构造和控制。
According to topological structure of control mesh, we generate generalized rational parametric surfaces in two manners . for a control mesh with consistent parameterization, the surface can be easily constructed because it can be mapped to differential manifold directly 对于具有简单拓扑结构,存在着一致的全局参数化的控制网格,我们将把控制网格直接映射到微分流形上,因此可以很容易地对曲面进行构造和控制。
(3 ) model reconstruction is a key step in reverse engineering . the acquisition of control mesh for loop subdivision surface from general triangle mesh is researched, and an algorithm is proposed to fulfill the reconstruction of subdivision surface from arbitrary dense mesh in topology (3)模型重建是逆向工程的重要环节,本文提出了从三角网格模型获得loop细分曲面的控制网格,从而实现了任意拓扑密集网格的细分曲面重建算法。
The approach to exactly calculate geometric parameters of subdivision surface, such as limiting point, tangent vector and normal vector, are illustrated . ( 2 ) the number of geometric elements ( vertex, edge, facet ) within control mesh grows exponentially as the increase of subdivision levels in general subdivision schemes (2)在正常的曲面细分过程中,控制网格上几何元素(顶点、边、面)的数量是按照几何级数增加的,会产生庞大的冗余数据。