建筑结构前后处理软件三维场景程序的开发

三维场景系统必须先解决复杂的三维场景的管理。本文介绍了利用Delphi的免费控件GL Scene进行程序开发，建立起一种面向对象的三维模型数据结构，并据此实现了基于OpenGL的实时三维视景系统。该系统实现了三维静态显示、三维动态漫游等功能。     

基于移动终端的增强现实虚实融合技术

针对传统移动增强现实系统中虚拟模型和真实背景之间存在较为明显的视觉差异,不能够给予用户良好的真实体验的问题。建立了一种在Android系统下虚实融合较为逼真的增强现实装配系统。该系统首先解决三维虚拟模型的解析、渲染、管理问题,然后研究了虚实融合场景图层的关系,最后完成整个系统的虚实融合场景的构建。采用该系统对齿轮油泵模型进行增强现实装配虚实融合场景的构建实验,结果表明:系统可以在真实场景中添加虚拟物体,并且显示结果逼真度高、沉浸感强,能够顺利完成对装配过程的指导。     

基于OpenGL的城市三维模型可视化研究

在介绍基于OpenGL的三维景观显示原理和关键技术的基础上，对地形、地物的可视化进行了分析，研究了对三维场景实时目标选取的方法和技术。     

基于3D技术的工厂动力设备实时监控画面开发应用

文章概述工厂动力设备三维实时监控画面开发应用过程,先对组成动力设备进行3D建模,把建好设备3D场景模型导入到一款具有内置3D引擎的平台软件中,开发出360度可随意缩放、随意旋转的三维实时设备模型,监控软件通过实时数据驱动的三维动态效果,直观形象地反映设备的生产状态以及运行情况。     

移动测量在超精细三维场景制作中的应用研究

近年来,随着城市信息化建设的不断深入,超精细三维场景的应用越来越广泛。本文首先从需求出发,分析了超精细三维场景在城市信息化建设中的重要性;然后针对传统作业方法的不足,重点研究了包括无人机倾斜摄影测量、移动扫描测量、动态纹理采集、手持三维扫描测量在内的多种新型移动测量技术在超精细三维场景制作中的应用情况。     

边坡工程中监测数据场三维云图实时动态可视化方法

实现监测物理量空间数据场的三维实时动态可视化表达,是边坡工程安全监测三维可视化在线分析的关键。空间数据场三维可视化最直观的表达形式是三维云图,其绘制方法包括面绘制和体绘制,而体绘制方法是实现三维数据场实时动态云图绘制的首选方法。鉴于X3D灵活的场景交互和丰富的三维几何造型节点,通过生成用于监测数据场三维云图显示的几何载体TEN模型,在提取监测点坐标并形成监测数据场的基础上,应用空间插值算法得到TEN网格节点的监测物理量数值,并按照特定颜色表映射到网格节点的颜色域值,提出基于X3D技术的空间数据场三维云图体绘制方法。以某水电站坝肩边坡和某水电站谷肩堆积体为例,应用该方法实现边坡和堆积体监测数据场三维分布云图的实时动态可视化显示,直观地揭示监测对象的变形趋势和可能的变形破坏模式,为该方法在水利水电和岩土工程的边坡及地下工程安全监测领域的应用提供参考。     

基于3DMAX的用户配电房三维设计软件系统的开发

随着网络及三维技术的发展,三维虚拟仿真技术越来越受到人们的青睐,逐渐的已经应用到各个领域之中。针对用户三维设计系统的运行和开发需求,设计并开发了基于3D Studio Max+Windows NT组合技术的三维设计系统。该系统可支持三维虚拟场景实时渲染,同时能够更好地呈现仿真对象的数量、虚拟设备三维模型的精细程度以及实时操作状态的动态变化等特点。配电房三维设计虚拟场景,设计并实现了支持操作者复杂操作交互过程逻辑控制,允许操作者根据自我认知进行自由的组合操作,使配电房三维设计系统更加符合真实操作情境及满足用户要求。     

BIM在钢结构详图设计软件开发中的实践

BIM以其先进的理念及在工程中成功的应用受到越来越多的关注,钢结构详图深化设计软件STXT基于其思想进行开发,采用以三维模型数据为核心,参数化建模及读取PKPM结构设计模型来完成模型搭建,进行详图设计。真实的三维模型显示方便实时查看、模型检查,通过三维模型自动生成全套施工图纸及进行工程量统计,本文将围绕上述特点进行了详细阐述。     

重量法测定水中悬浮物和全盐量的不确定度评定

随着移动技术的迅猛发展,传统的纸质海图开始走向移动平台.然而,移动环境下使用环境的改变以及使用场景的多样性给电子海图的显示带来了新的挑战:在尽量减少用户交互的前提下自动调整地图显示,最大限度满足用户需求.论文基于上下文的地图感知模型从上下文因素选取、模型建立以及触发机制等方面对电子海图的数据组织与显示进行了研究,优化了移动海图的调度与显示,为基于上下文的智能化电子海图研究提供了理论和方法上的借鉴.     

上下文驱动的电子海图数据调度与显示方法研究

随着移动技术的迅猛发展,传统的纸质海图开始走向移动平台。然而,移动环境下使用环境的改变以及使用场景的多样性给电子海图的显示带来了新的挑战:在尽量减少用户交互的前提下自动调整地图显示,最大限度满足用户需求。论文基于上下文的地图感知模型从上下文因素选取、模型建立以及触发机制等方面对电子海图的数据组织与显示进行了研究,优化了移动海图的调度与显示,为基于上下文的智能化电子海图研究提供了理论和方法上的借鉴。     

High-speed visualization of time-varying data in large-scale structural dynamic analyses with a GPU

Large-scale structural dynamic analyses generally produce massive amount of time-varying data. Inefficient rendering of these data seriously affects the quality of display of and user interaction with the analysis results. A high-speed visualization solution using a GPU (graphics processing unit) is thus developed in this study. Based on the clustering concept, a key frame extraction algorithm specific to the GPU-based rendering is proposed, which significantly reduces the data size to satisfy the GPU memory requirement. Using the key frames, a GPU-based parallel frame interpolation algorithm is also proposed to reconstruct the complete structural dynamic process. Particularly, a novel data access model considering the features of time-varying data and GPU memory is designed to improve the interpolation efficiency. Two case studies including an arch bridge and a high-rise building are presented, confirming the ability of the proposed solution to provide a high-speed and interactive visualization environment for large-scale structural dynamic analyses.     

Analysis of conflict and change in construction projects

Conflict and change can have considerable impact on the success or otherwise of construction projects. Examples of conflict and project change have been collected in structured interviews within a series of organizations which are clients of construction activities. A methodology which uses a process of hierarchical decomposition has been developed for classifying this data and rendering it suitable for subsequent analysis. The results presented in the paper are of a prelirninary investigation and lend weight to the hypothesis that the creative management of conflict and change can benefit construction industry clients.     

Citizenship behavior and effectiveness in temporary organizations

Studying temporary organizations from a behavioral perspective, we theorize how Organizational Citizenship Behavior (OCB) as a form of cooperative effort may enhance the effectiveness of this type of organization, rendering the temporary organizations vital, even beyond their termination. Building upon such a perspective, a quantitative, cross-sectional study was conducted, with 247 project managers and workers participating. Principal component analysis and hierarchical regression analysis were performed. The results reveal that OCB not only facilitates meeting the “iron triangle” (time, budget, quality) of project management but also improves the relationship quality among individual actors beyond the termination of projects. This relationship is partially moderated by project duration. The implications of the findings are discussed.     

建筑物快速3D建模与渲染

AUTOCAD - 2 0 0 2提供了 5种 3D建模方法与实施渲染的 5个步骤 ,利用WINDOWS平台与CAD功能 ,缩短了建筑物的 3D建模与渲染的时间。建筑物的 3D建模与渲染广泛应用于建筑设计及建筑广告领域     

基于GDI+的地形图符号库中点符号的设计和实现

地形图符号库是数字化成图系统与地理信息处理软件中的一个重要组成部分。符号绘制是实现地图符号库的关键,GDI+作为微软推出的最新的图形设备接口,与之前的GDI相比,具有更加强大的图形图像处理功能,给地图符号带来了新的绘制技术。本文在分析GDI+的基础上,按照分层的思想归纳了点符号的构成单元,并通过组合GDI+函数绘制出符号,并在此基础上提出了一些地图符号绘制改进的方法。     

Fast Volume Rendering and Cutting for Finite Element Model

Based on the incremental slicing, a direct volume rendering algorithm for finite element meshes is proposed. To improve the algorithm efficiency, the element compensation method and sliced polygon forming method are presented. The image quality is improved greatly by the hybrid rendering of both the volume data and geometric surfaces. We also integrate a volume cutting method with arbitrary convex polyhedron into the volume rendering pipeline. This offers the user more flexibility to explore the data distribution inside structures.     

A Local Database Manager for Engineering Analysis Systems

Abstract: A local database manager (LDBM) is presented. It is a software development tool consisting of a set of easy-to-use in-core data management subroutines written in FORTRAN 77. One of the main motivations for the development of this LDBM was to enhance the eflcient use of core memory which seems to be obvious with respect to a PC programming environment. However, even on virtual machines, high performance achieved by minimizing page faults is strongly based on a sophisticated database management system (DBMS). In order to accomplish this objective, the LDBM allows the use of different data types according to the requirements of the actual situation and to the existing programming environment. Integer, short integer, real, double precision, complex, double complex and character data can be handled. Moreover, a two-level hierarchical data structure is used which groups related data in a different and more economic way rather than by means of increasing the number of levels in the DIMENSION statement. Of course, old, no longer used data may be deleted, leaving room for the allocation of new data. Using a technique of 'flexible garbage collection', i.e. the ensuing gap after the deletion of a data block is not automatically closed, the time consumed by the LDBM during a deletion operation is actually not affected by the length of data blocks.     

旧路平面线形拟合中确定交点的方法浅析

分析了最小二乘法用于旧路直线段拟合的优点,提出了一套行之有效的交点确定解决方案,使用Excel软件实现直线路段坐标数据的最小二乘拟合,以自动确定直线方程和交点坐标的方法代替人工穿线,将Excel 2003与AutoCAD 2006结合起来,实现了数据计算和图形绘制的同步进行,并通过工程数据检验,获得了理想的结果.     

空间多维地籍信息的研究与系统实现技术

鉴于城镇地籍信息具有时间特性而传统GIS缺少时间变化描述的特点,根据地籍信息的变化特征,建立地籍时空数据结构和拓扑关系模型,解决了层次结构数据的操作问题,从而实现历史、现时和预测未来信息的可比性,实现地籍的动态变更。