Therefore the 3d visualization is the essence of visualization technology . this thesis discusses the realized principle of 3d visualization by researching graphics arithmetics , coordinate transformation , third dimension graphics display and so on , the realized route is decided by researching the processes of 3d visualization 本文从图形学入手，通过对图形生成算法、坐标变换、真实感图形显示等算法的研究来探讨三维可视化的实现原理，通过研究三维可视化的过程来确定电力培训系统的三维可视化路线。
Experimental results show that the new model is efficient and flexible . direct volume rendering has been done with the volume date that came from the 2d image series . finally we displayed the truly 3d image by the computer graphic technology of eliminating the hide surface and the light 对三维重建做了初步的研究，将二维mri图像序列转化为三维体数据，应用体绘制算法实现了三维重构，并通过光照、隐藏面消除等计算机图形学算法实现真实感图形显示，从计算机屏幕上给出了形象逼真的人体脑部三维结构立体视图。
( 1 ) expounding the basic concept of utilizing the computer graphics technology to realize the visual display of the chemical process , namely visual simulation ; ( 2 ) raising to establish math model of simulation chemical devices with the methods of oop and ood and realizing the class hierarchy architecture of device math model through class inheritance ; ( 3 ) researching the display methods of realizing 3d chemical scene with opengl 本文首先阐述了化工过程视景仿真及opengl的基本概念；其次，提出了利用面向对象的分析和设计方法，建立仿真中化工设备的数学模型，通过类的继承性，实现设备数学模型的类层次结构。第三，深入研究了利用opengl实现三维化工场景真实感图形的显示方法；第四，以燃烧炉为对象开发了交互式的视景仿真软件。
This paper has researched mainly key technology in visualization , including the features of visualization of simulation in real - time and distributed environment , 3d modeling , scene simulation and the real - time display of real graphics , in detailed as follows : ( 1 ) it analyses the features and demands of visualization technology of simulation in real - time and distributed environment and gives the plan of realization , it has also defined a feasible software develop environment 论文主要对实时分布仿真可视化的特点、三维建模、视景仿真和真实感图形的实时显示等技术进行了研究和实现。具体工作如下： 1分析了实时分布仿真下可视化技术的特点和需求，提出在实时分布仿真环境下实现可视化的构想，确定了可行的软件开发环境； 2
Scientific computation visualization interactive virtual reality computer dynamic simulation etc . , to study thoroughly and carefully on critical technologies such as mixed - language programming simplification of scene models displaying realistic image and animation of 3d scene models and so on in this dissertation , the methods to build scene models were studied and applied to develop a dynamic simulation system of 3d railway scene based on this idea , the major study contents and results can be summarized as follows : 1 ) mixed - language programming can complement each other between different programming languages and the method has a general significance and can become popular many computation models including development of dtm optimum of dtm and reorganization of dtm were developed with fortran language in order to use the ripe codes , the dissertation succeeded in integrating the developed fortran codes to the visual c + + environment and achieving the course of mixed - language programming 2 ) the methods to build scene models for 3d location design were discussed in the dissertation and the development and animation of scene models had been realized by applying synthetically those technologies such as computer graphic computational geometry and geometrical modeling and computer dynamic simulation etc , and adopting opengl 3d graph library then achievement was got by using the technology of 3d visualization to livingly express design results 3 ) combing with the concerned study and development projects , adopting vc + + as development tools and in the light of those theories and algorithms stated in this dissertation , a software , which could build scene models with realism for 3d railway location design , in the name of " the dynamic simulation system of 3d scene of railway " was developed . , the correctness was proved by using the software to build the 3d scene models and achieve their animation of suining - chongqing railway and yunnan - xizang railway 本文综合利用计算机图形学、科学计算可视化、人机交互、虚拟现实、计算机动态仿真等理论和技术，针对混合语言编程、真实感图形绘制以及三维景观模型的动画驱动等关键技术，进行了深入细致的研究，从而探讨了建立逼真景观模型的方法，并基于本文提出的方法研制了一个铁路线路三维景观动态仿真系统。基于这一思想，本文主要研究内容及研究成果如下： 1 )混合语言编程可以实现语言优势互补，具有普遍意义。针对数字地面模型的建立、优化、重组等计算模块是成熟的fortran程序代码，本文成功实现了vc + +与fortran语言的混编； 2 )紧紧围绕三维选线设计中景观模型的建立方法展开研究，综合利用计算机图形学、计算几何及几何造型学以及计算机仿真技术，采用opengl三维图形库，实现了景观模型的建立以及动画驱动，使得三维可视化技术成功应用于选线设计成果的三维直观表达； 3 )结合有关科研课题，利用vc + +开发工具，以本文所述的理论和算法为基础，研制和开发了一个建立三维选线设计逼真景观模型的系统软件- - “铁路线路三维景观动态仿真系统” 。
With the development of computer technology , computer graphics technology develops swift and violently . the clipping of graphics is the most basic contents in cg . it is a useful tool in algorithms about hiding line , hiding face and showing of third dimension graphic 随着计算机技术的迅速发展，计算机图形学技术得到迅猛发展，图形的裁剪是计算机图形学中最基本的内容之一，它在消除隐藏线、隐藏面及真实感图形的显示等算法中是很有用的工具，以往对裁剪算法的研究主要集中在裁剪直线和裁剪多边形两方面。
Putting forward an architecture of rendering and interaction module , scene data structure , entity model based on the principles of realistic images . to speed up rendering , some optimization methods are given . because of high precision of picking in the system , a picking algorithm based on ray - tracing is presented 根据真实感图形绘制的基本原理，确定了图形绘制与交互模块的体系结构、三维场景模型和实体模型的表示方法；为了加快图形绘制的速度，给出了系统的优化方法；并根据本系统拾取精度要求高的特点，对传统光线跟踪算法进行简化，完成了场景实体的快速拾取； 4
