参数表示

For regular topology surface, intermediate surface local texture mapping are used; for irregular topology surface, subdivision surface local texture mapping are used. So different topology surface using different texture mapping methods can solve the contradiction between texture effect and processing speed when they are dealt with by single method. The three judge conditions of texture distortion in the process of mapping onto the sphere surface are discussed and the exiting algorithms of mapping are analyzed, the new algorithms of mapping onto the sphere surface are presented. In order to enhance the realistic of graphics, a new function of wood texture is presented. OpenGL is also introduced in this papers and some realization examples of texture mapping based on OpenGL under the environment of VC++ and POV-RAY are presented in some chapters.

对于简单拓扑表面，利用改进的两步纹理映射，对于复杂拓扑表面利用新的面片分割算法，初步解决了颜色纹理中速度与走样之间的矛盾；通过对球面纹理时纹理不变形的三个判断条件的研究，分析了现在各种球面纹理映射算法，并在此基础上提出了一种基于等面积的半球面纹理映射算法，明显减少了球面纹理的纹理变形；针对现有的木纹纹理中，两种表示木纹的颜色差距表现出的颜色突变问题进行研究，提出对这两种颜色进行线性插值或二次插值，使生成的木纹纹理颜色更加连续，更加逼真；在VC++环境下，通过调用Open GL的图形库及在Pov-Ray软件环境下，实现了参数化纹理、球面纹理、凹凸纹理及木纹纹理等各种算法。

Based on the principle of optimality,the search problem is then transformed to an equivalent problem of deterministic distributed parameters system,represented by a second order PDE.

采用分析的方法来研究随机运动目标的最优搜索问题，并将原问题转化为由一个二阶偏微分方程所表示的确定性分布参数系统的等价问题，推导出随机运动目标的最优搜索问题的HJB方程，并证明了该方程的解即是所寻求的最优搜索策略。

The icon and connector provide the graphical representation and parameter definitions needed if you want to use a VI as a sub-routine or function in the block diagrams of other VIs.

图标和连接器提供了VI作为其他VI中的子程序或函数时的图形表示和所需的参数定义。

This data model establishes a structure of product tree with flexible properties,includes a parameter driven rule representation,and combines the convert procedure of tree view from design to build.

该模型建立了具有柔性特点的产品结构树，模型包含了一个由参数驱动的配置规则表示方法，将范树由设计视角向制造视角的转换过程与数据模型有机结合起来。

These efforts help to disassemble the complex task of the ship structure knowledge system into some relatively simple sub-tasks, and to found the parameter representation method for concerned knowledge in the knowledge base of structure design.

船体结构布置和计算纷繁复杂，本文通过对大中型集装箱船的结构模块化分析和计算，给出了大中型集装箱船系列化的主尺度变换原则、结构模块的划分方法以及结构标准件和可变件划分计算方法，为集装箱船中剖面结构设计知识系统的任务分解以及结构设计知识库中的有关知识的参数化标准模块表示打下了基础。

Analysis was done for the parameter selection of Montgomery algorithm in ringF_p /x·p(x. Through suitable algorithm parameter and representation change in ring, wereduce the complexity of multiplication in F_p /x.

分析了一类商环F_p／x·p(x上乘法的快速实现问题，通过选择合适的参数，并基于欧几里德算法改变了商环中元素的表示形式，降低了商环F_p／x·p(x上乘法运算的复杂度。

An algorithm which can draw any complex surfaces expressed by explicit equation or parametric equation was given.

提出了显式方程和参数方程表示的曲面的一种绘制算法，该算法可以绘制任意复杂的方程曲面。

The dissertation focuses on methods of parametric representation and deformation control, initialization problems and global optimization of the objective functions of the deformable models and templates.

论文重点讨论了所提出的各类可变形模型及模板的参数化表示及其变形控制、模型及模板的初始化以及目标函数的最优化搜索方法。

Substitute surface conception was introduced in the tolerance modeling. Intrinsic deviation between the substitute surface and the theoretical surface was described by vector function on the basis of the vector parametric representation of the theoretical surface.

引入替代表面的概念，基于理论表面矢量参数化表示，用矢函数来描述替代表面和理论表面之间的本质特征偏差。

Generalized rational parametric surface can be controlled precisely and flexible, and it is easy to model local features and 3D primitives.

广义有理参数曲面可以进行精确控制，不仅易于表示局部特征，还提供了更多的方法来精确生成三维图元。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。