【正文】 e rock will both have negative effects on the construction. Therefore, having a clear understanding of geological characteristics of underground rock, the formation, geological distribution and risk parameters of the tunnel excavation contributes a lot to safe and scientific tunnel digging. With China39。s plex diversity of tunnel design, construction, form, construct mode, is developed based on expressions of the traditional 2D maps and mockups. How to achieve a 3D visual model of the geological model, tunnel model, and analysis of the geology, can not be ignored in the railway construction. In this paper, we obtain the threedimensional simulation of the tunnel by use of the VC++ development platform and OpenGL software interface. While the system is running, the 3D railway tunnel model, it is effective for the geological resource data management, 3D automatic modeling,3Dvisualization and spatial analysis, the building of 3D visualization railway tunnel model demonstrate the design intent of the engineering staff, provide a valuable guiding significance on the subsequent construction, management, operation and have high practical value. KEY WORDS: Railway tunnel,3D modeling, OpenGL, Spatial analysis 隧道三維建模技術(shù) 的研究 共 42 頁(yè) 第 3 頁(yè) ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ 裝 ┊ ┊ ┊ ┊ ┊ 訂 ┊ ┊ ┊ ┊ ┊ 線 ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ 目 錄 目錄 摘 要 .............................................................................................................................. 1 第一章 緒論 ................................................................................................................ 5 研究背景及意義 .............................................................................................. 5 國(guó)內(nèi)外研究現(xiàn)狀 .............................................................................................. 6 國(guó)外研究現(xiàn)狀 ....................................................................................... 6 國(guó)內(nèi)研究現(xiàn)狀 ....................................................................................... 7 研究?jī)?nèi)容 .......................................................................................................... 8 第二章 隧道三維建模的理論基礎(chǔ) ............................................................................ 9 非均勻有理 B 樣條方法 ................................................................................. 9 黃金分割法 .................................................................................................... 10 單峰函數(shù) ............................................................................................. 10 三維顯示技術(shù) ................................................................................................ 12 坐標(biāo)系統(tǒng) ............................................................................................. 13 OpenGL 變換 ...................................................................................... 13 OpenGL 光照 ...................................................................................... 15 OpenGL 紋理貼圖 .............................................................................. 16 第三章 隧道三維仿真建模 ...................................................................................... 18 隧道三維仿真系統(tǒng)場(chǎng)景的建模原則 ............................................................ 18 隧道建模分析 ................................................................................................ 19 隧道模型結(jié)構(gòu)分析 ........................................................................................ 19 第四章 隧道三維模型設(shè)計(jì)及內(nèi)部計(jì)算 .................................................................. 21 隧道模型建構(gòu) ................................................................................................ 21 隧道內(nèi)部計(jì)算 ................................................................................................ 23 隧道橫斷面的若干計(jì)算 ..................................................................... 23 隧道橫斷面的曲線逼近 ..................................................................... 25 隧道頭（尾）計(jì)算 ........................................................................................ 28 隧道頭（尾）斜斷面的計(jì)算 ............................................................. 28 連拱隧道洞口倒 角圓弧計(jì)算 ............................................................. 29 第五章 隧道裁剪算法研究 ...................................................................................... 31 隧道三維建模技術(shù) 的研究 共 42 頁(yè) 第 4 頁(yè) ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ 裝 ┊ ┊ ┊ ┊ ┊ 訂 ┊ ┊ ┊ ┊ ┊ 線 ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ ┊ 裁剪算法 ........................................................................................................ 31 裁剪的原理 ......................................................................................... 31 二維線段的裁剪 ................................................................................. 31 多邊形的裁剪 ..................................................................................... 33 裁剪算法 ............................................................................. 33 裁剪算法的基本方法 .............................................. 33 裁剪算法的不足 ...................................................... 35 對(duì) WeilerAtherton裁剪算法的改進(jìn) ............................................................ 35 算法的數(shù)據(jù)結(jié)構(gòu) ................................................................................. 35 裁剪前的預(yù)處理 ................................................................................. 35 特殊點(diǎn)處理 ......................................................................................... 37 改進(jìn)算法執(zhí)行流程 ............................................................................. 38 改進(jìn)算法的優(yōu)勢(shì) ................................................................................. 39 結(jié)論 ......