With above iso - surface reconstruction and the cutting of reconstructed 3d models , it is convenient to observed the inner tissues or organs images information around some point , and at the same time a basic work is given to the farther virtual acupuncture human 结合前几章的表面模型的构建、模型的剖切工作，比较好地显示了穴位空间位置信息和周围组织或器官的关系，为开展中医针炙穴位虚拟人体研究工作打下了一个基础。
Combining the texture rendering of opengl with the display of cutting surface of 3d models , it is easy to observe the inner tissues or organs images information . in chapter five , we had studied the interactive visualization of acupuncture point of reconstructed 3d models . a interactive point orientation methods from the select operation of opengl is presented in this dissertation 第四章对模型的剖切处理进行了阐述，为了观察三维体数据内部组织结构和空间位置，避免表面重建不能显示体数据内部信息问题，提出了一种类似光照投射法的算法，采用射影空间矩阵进行运算来获取切割面的图像信息。
This thesis primarily makes below the work of a few aspects : ( 1 ) the method to append the section line in the geological section plane and the geological plane graph intersected each other ; ( 2 ) the principle and method that automatic determinate of orebody on transverse section with the neural network theory was presented , and draw the slippery boundary of ore ; ( 3 ) the method that drawing the surveying well and lane way engineering in the geological and survey graph ; ( 4 ) the method to automatic calculation and statistics output ore reserves and grade ; ( 5 ) the method that automatic creating the geology cross section of the hole ; this thesis realizes automation for managing geological graph based on the substantive research work 本论文主要作了以下几个方面的工作： ( 1 )提出了在相交平面图和剖面图中添加剖面剖切线的方法； ( 2 )提出了应用人工神经网络理论确定剖面中矿体界线的理论和方法以及矿岩界线圆滑的原理与方法； ( 3 )实现了矿山生产实测工程数据处理与地测图件的有机结合； ( 4 )实现了矿块地质品位和储量的自动计算和统计输出； ( 5 )提出了中深孔炮孔排面地质剖面图自动剖切的原理和方法。本论文在大量研究工作基础上，实现了地测图件管理的计算机自动化。
Based on the valuable experience of the predecessors and the present situation existing in the area of 3d modeling , this paper makes a research of the technical difficulties in mining designing - - the construction of mineral deposit model and the extraction of slices in any orientation , by making comprehensive use of many mathematical theories and methods , database and graphics processing technique and puts forward the theory of 3d modeling based on discrete algorithm 鉴于此，本文借鉴系统工程的思想，结合前人研究工作中的宝贵经验，针对目前三维建模领域的现状以及存在的一些问题，综合运用多种数学理论与方法、数据库与图形图像处理技术，对矿山生产设计中的技术难点? ?矿床三维模型的建立与任意剖面图的剖切进行了研究与尝试，提出了基于离散算法的三维建模原理和模型交互剖切技术。
This paper concludes the following items : the mutual transform between the graphics data and attribute data of 3d model and database the theory of 3d modeling based on discrete algorithm and techniques dealing with bifurcation orebody the technique of model render based on opengl the theory and algorithm of model interaction and division according to these theories , the built model can be used to realize the visualization of production designing , extraction of slices in any orientation and production index calculations 论文从工程应用的角度出发，主要进行了以下几个方面的工作：三维模型的空间数据和属性数据与数据库的相互转换基于离散算法的三维建模原理和分歧矿体处理技术基于开放图形库( opengl )的模型渲染技术模型交互、剖切原理与算法实现基于该原理和方法建立的三维模型可用来实现生产设计可视化、任意方位剖面的剖切、各种生产指标的精确计算等。
Therefore , based on the design of earth dam and not restricted by the traditional plane design , a cad system integrated with three dimensional model for geological data processing , structure analysis and computation , auto computation of work load , auto drawing of engineering picture was developed . which is a great significance for designing of hydropower projects 因此，从土石坝坝体设计入手，突破传统的平面设计，开发一个集地形地质资料处理、三维模型建立与任意剖切、结构分析计算与图形设计接日、工程量自动计算、工程图自动生成为一体的cad系统，对水利行业水电工程设计具有重要意义。
This 3d modeling method overcomes the limitations of traditional algorithm which is extremely complicated , difficult in combination operation , hard to build the correct topologicai relation among data and solves a series of technical difficulties such as model interaction and division . therefore it greatly facilitates and simplifies the construction and processing of 3d model 该建模方法克服了传统算法建模数据结构过于复杂，交接拼合计算困难，难于建立模型控制点之间正确的拓扑关系等局限；解决了模型交互、任意剖切等技术难题，大大方便和简化了三维模型的建立和后续处理过程。
Secondly , the artificial neural networks and mixed evolutionary computation are employed into the mathematical simulation of complex geological structure , and with gis and visualization technique , the method of geological digital 3 - d modeling and visualization is presented . so , not only the functions of making geological section and querying spatial information could be achieved , but also the spatial distribution of geological structures and their complex relationship could be described visually . thereby an interactive and convenient way for engineering geological design could be actualized （ 2 ）提出了复杂地质构造数学模拟的神经网络方法与混合进化方法，并利用gis技术和可视化技术，深入研究了数字地质三维建模及其可视化方法，实现了地质三维任意剖切、信息空间查询与管理等功能，从而为直观描述地质构造的空间展布及其相互间的复杂空间关系，以及快捷、交互地进行工程地质设计提供了新的途径与手段。
2 . use the mew accelerate function of opengl to accelerate the units display . have adopted the three dimension graphics and opengl ' s technology , it makes use of stencil test to carry on cutting operation , which reduces complexity of programming and has raised the speed and efficiency of displaying 一2 ?根据离散元单元图可视化难点，结合目前各种国内外图形可视化加速方法特点，我们采用新大加速方法进行单元加速，利用op即gl加速结合计算机图形学原理加快单元图形显示，通过对剖切单元表面的stencil操作，减少了大量求法线操作，加快单元剖切操作，减少了编程复杂性，提高了显示速度和效率。
And it also can not give the exact appearance place . aiming at this question , basing on studying the underground cavity in laxiwa hydroelectric station , through establishing entity model , combining model , slicing model , and vector analysis , article introduce a method of analyzing the stability of block and get the certain search . all the graph result is showed in autocad , which is a graph software 针对此问题，本文以拉西瓦水电站地下洞室为研究场所，以autocad图形软件为平台，建立地下洞室和结构面的实体模型，通过对实体模型的组合、剖切获取结构面的洞顶及洞壁展示图，再以结构面展示图为基础，应用矢量运算对块体进行稳定性分析，并在autocad中显示结构面展示图和块体展示图。
