基于Java3D的三维动态显示的研究

通过对Java3D数据结构和程序框架的描述,结合具体实例,阐述了基于Java3D的三维形体的构建、纹理映射、运动等内容,研究了如何利用鼠标和键盘实现对其控制的操作方法,并将Java3D技术与Web技术相结合,实现在网页上的三维动态显示。     

Java 3D应用于现代远程教育的关键技术

本文对Java3D技术和远程教育相结合的优势和关键问题进行了研究和探索,首先提出了一种基于Java3D技术远程教育系统的框架结构图,然后结合网络多媒体三维课件的制作,介绍了在Java3D下三维场景建模、交互动画与多媒体功能的实现。     

基于Java 3D的三维模型可视化

分析了现有可视化技术的不足,提出了用Java3D实现产品数据信息的可视化,深入研究了用Java3D实现可视化的机理和方法,并给出了具体的应用实例。     

用Java3D实现Web虚拟现实的研究与实践

阐述了Java3D在实现Web桌面级虚拟现实中的各种优点，并结合大学物理虚拟实验的开发实例，详细介绍了Java3D技术的开发流程，其中包括实验场景图绘制、建立横型及界面设计与交互实现等。     

Java3D虚拟室内装饰效果展示研究

目前虚拟现实的建模方法主要采用OpenGL,VRML等语言进行编程,这存在着难以掌握、不易广泛推广等缺点。而Java3D作为一种新兴的三维开发应用程序接口,则提供了高效的开发性能。结合实际应用中的实现方法和步骤,对使用Java3D构建虚拟环境,丰富三维表现效果,实现环境与用户的交互等进行了研究,并给出在Java3D场景中实现虚拟场景漫游的方法。     

基于Java3D虚拟漫游场景切换的方法实现

Java3D技术与Web技术相结合,网络环境构建虚拟三维的场景,运用Java3D应用程序在同一个Locale对象中更换两种模式的BranchGroup节点,鼠标点击事件的方法实现两个漫游场景的切换.     

基于X3D和Java的虚拟人体运动仿真的研究

人体运动仿真是虚拟现实领域新的研究热点,对X3D的相关知识进行了介绍,研究了利用Java平台和X3D技术实现人体运动的仿真。     

基于X3D的三维地形可视化研究

三维地形可视化技术一直是地理信息系统、数字摄影测量、虚拟现实等领域的研究热点。介绍了X3D的相关知识,利用Java平台和X3D技术实现三维地形的可视化。     

VRML与Java的高效结合分析

虚拟现实技术的标准语言VRML在当前互连网上作为通用规范受到了广大用户的积极支持和愈加广泛的应用。但由于其自身功能的局限性,制作较复杂的动画效果能力稍显薄弱。本文主要通过具体事例来阐述Java语言在控制由VRML所构建实际场景的实现机制以及Java与VRML高效结合后对于Internet上理想的3D虚拟场景形成的积极意义。     

基于Java3D的装配体导入技术与实现

分析了装配体文件和零件文件的结构及其零件在装配体中的表示方式,以三角面片的方式将装配体导入到Java3D的场景中,构建了合理的场景结构,最后指出使用Java语言实现分布式协同设计的优越性。     

基于LOD的三维地形数据的组织与实时绘制

LOD(Levels of Details,细节层次)是解决大规模地形实时渲染的一项关键技术。将LOD应用于三维数字地球中,针对LOD在实时地形绘制、纹理与高程数据映射等方面进行了分析,在采用数据分块、动态LOD技术、动态纹理等技术的基础上实现了海量数据的快速漫游,得到实时显示效果。     

基于LOD的大规模地形渲染技术研究

简要介绍了基于四叉树的大规模地形的网格构造,提出了一种基于二元三角树的层次细节模型,同时结合地形分块策略和实时优化配置网格算法,讨论了误差控制下视点相关的多分辨率地形的实时构网,并给出了该层次细节模型在地形渲染中的实现方法。     

Loop细分曲面的精加工刀路生成方法研究

以Loop细分曲面为例,根据细分曲面的网格迭代特性,讨论了细分曲面的精加工刀具轨迹生成方法,对精加工时使用球头刀和刀具接触位置的偏移来生成刀具轨迹位置.在刀具轨迹生成过程中提出一种Z-map空间网格点存储技术,同时为了提高加工质量提出干涉检查和修正方法,并进行了实例验证.结果表明该类型刀具轨迹生成方法对于网格曲面的加工是可行、有效的.     

Feature-based multiresolution techniques for product design

INTRODUCTION 3D CAD systems for the feature-based B-rep solid models (Choi et al., 2002; Kim et al., 2003; 2005; Koo and Lee, 2002; Lee et al., 2004; Lee, 2005a) are becoming more suitable for CAD when compared with the conventional polygon-based mul- tiresolution modelling in computer graphics (Cignoni et al., 1998; Schr?der et al., 1992). As illustrated in Fig.1b, the object of the feature-based multiresolution modelling is a solid model where the suppressed ob- jects are form feat…     

A new algorithm of brain volume contours segmentation

INTRODUCTIONSegmentation ,acentralissueofcomputervision ,isafundamentalprocessingstepinmostsystemsthatsupportmedicaldiagnosisorplan ningofsurgicaloperationsandradiationtreat ments (Wyattetal.,2 0 0 0 ;Wintereretal.,2 0 0 2 ;Baoetal.,1998) .Contour basedse…     

3D Reconstruction technique for tomographic PIV

Tomographic particle image velocimetry(Tomo-PIV) is a state-of-the-art experimental technique based on a method of optical tomography to achieve the three-dimensional(3D) reconstruction for threedimensional three-component(3D-3C) flow velocity measurements. 3D reconstruction for Tomo-PIV is carried out herein. Meanwhile, a 3D simplified tomographic reconstruction model reduced from a 3D volume light intensity field with 2D projection images into a 2D Tomo-slice plane with 1D projecting lines, i.e., simplifying this 3D reconstruction into a problem of 2D Tomo-slice plane reconstruction, is applied thereafter. Two kinds of the most well-known algebraic reconstruction techniques, algebraic reconstruction technique(ART) and multiple algebraic reconstruction technique(MART), are compared as well. The principles of the two reconstruction algorithms are discussed in detail, which has been performed by a series of simulation images, yielding the corresponding reconstruction images that show different features between the ART and MART algorithm, and then their advantages and disadvantages are discussed. Further discussions are made for the standard particle image reconstruction when the background noise of the pre-initial particle image has been removed. Results show that the particle image reconstruction has been greatly improved. The MART algorithm is much better than the ART. Furthermore, the computational analyses of two parameters(the particle density and the number of cameras), are performed to study their effects on the reconstruction. Lastly, the 3D volume particle field is reconstructed by using the improved algorithm based on the simplified 3D tomographic reconstruction model, which proves that the algorithm simplification is feasible and it can be applied to the reconstruction of 3D volume particle field in a Tomo-PIV system.     

A new algorithm of brain volume contours segmentation

This paper explores brain CT slices segmentation technique and some related problems, including contours segmentation algorithms, edge detector, algorithm evaluation and experimental results. This article describes a method for contour-based segmentation of anatomical structures in 3D medical data sets. With this method, the user manually traces one or more 2D contours of an anatomical structure of interest on parallel planes arbitrarily cutting the data set. The experimental results showed the segmentation based on 3D brain volume and 2D CT slices. The main creative contributions in this paper are: (1) contours segmentation algorithm; (2) edge detector; (3) algorithm evaluation. Project (No.69931010) supported by the National Natural Science Foundation of China     

网络游戏地形开发中消除龟裂现象的技术探讨

本文论述了在网络游戏地形开发中消除龟裂现象的技术.通过四叉树和LOD等技术的探讨,对几种消除龟裂现象的算法进行了研究,有效解决了不同分辨率网络间接边的龟裂问题,而且它们对于增强地形模型的绘制效率也是行之有效的.     

一种三维模型检索直方图比较算法

直方图方法常用于计算机视觉领域,好的直方图比较算法能够有效地提高检索的性能.但直方图比较算法在三维模型检索中的应用则较少得到研究.应用方向梯度直方图提取三维模型的直方图特征,然后给出一种直方图比较算法用于三维模型检索.实验结果表明：该直方图比较算法对某些种类的模型的检索性能比已有的算法更优.     

三维激光打标机的纹理映射技术研究

在分析国内外任意三维曲面激光打标现状的基础上,通过介绍基于三维激光振镜系统自动变焦原理和面向三维激光打标加工的三维纹理数学模型的生成过程,研究了产品三维stl面展开的纹理映射算法,实现了产品三维曲面无尺寸变形和形状扭曲的激光打标方法。