基于网络教育的网上支付系统的设计和实现

现代远程教育——网络教育的影响力越来越大,接受这一新教育模式的学生规模也在日益增长,但教育的传统收费方式限制了学生的异地学习。探讨了引进网上支付这个已经被其他行业广泛接受的支付方式的可能性,设计了整个报名、支付一体化系统的流程架构以及讨论了根据目前情况具体实现的方法。     

一种大范围复杂场景的快速绘制算法

文章对如何提高大范围复杂场景的显示速度进行分析,利用物体的空间拓扑结构对空间场景进行预裁剪,同时,建立了合适的模型调度策略,并将两者相结合给出了一个大范围场景的快速绘制算法。文中用一个实际应用说明该文提供的绘制算法的有效性。     

Improved pruning of large data sets for the minimum enclosing ball problem

Minimum enclosing ball algorithms are studied extensively as a tool in approximation and classification of multidimensional data. We present pruning techniques that can accelerate several existing algorithms by continuously removing interior points from the input. By recognizing a key property shared by these algorithms, we derive tighter bounds than have previously been presented, resulting in twice the effect on performance. Furthermore, only minor modifications are required to incorporate the pruning procedure. The presented bounds are independent of the dimension, and empirical evidence shows that the pruning procedure remains effective in dimensions up to at least 200. In some cases, performance improvements of two orders of magnitude are observed for large data sets.     

基于OpenGL的真实感图形绘制技术及应用

科学计算可视化, 计算机动画和虚拟现实是现代计算机图形学的三个热点, 而这三个热点的核心都是三维真实感图形的绘制。通过VC + + 环境下的编程实践, 系统地总结了基于OpenGL 技术实现真实感图形绘制( 包括反走样、消隐以及光照模型等) 的基本步骤和方法, 并结合具体实例, 介绍了真实感图形绘制技术在地矿工程三维实体构模中的应用。     

真实感显示的消隐方法

在本系统中,我们主要采用了两种消隐方法,它们是背面删除及Ｚ缓冲区深度排序法。背面删除法用于单个实体的消隐,而Ｚ缓冲区深度排序则用于整个３Ｄ布景的隐藏面的删除。通过这两种类型的隐藏面的消隐方法,我们就可以生成一个真实的３Ｄ图形。     

遮挡剔除技术在Unity场景优化中的应用

基于Unity开发的虚拟现实、增强现实或游戏等产品,在运行过程中,需要进行实时渲染。产品的运行效率决定于场景的复杂程度,因此该产品开发过程中需要对场景进行优化。遮挡剔除技术作为一种场景优化技术,被Unity所支持。本文通过对Unity中Occlusion Culling的应用和Occlusion面板的设置,实现了使用遮挡剔除技术对unity场景的优化。     

大规模场景的消隐技术

计算机图形学的快速发展使处理大规模场景中的数据变得日益重要，文章主要讨论了近几年最新发展的消隐算法。     

移动环境下三维场景的实时渲染技术研究

讨论了移动三维图形的实时显示技术,通过建立LOD模型和采用分层分块的数据组织方式,并采用基于四叉树层次结构的视景体裁剪优化算法,来减少场景渲染的模型数据量,从而加速三维实体模型的显示速度,达到流畅连续地实时显示移动环境下三维场景的目的。     

View-independent Contour Culling of 3D Density Maps for Far-field Viewing of Iso-surfaces

In many applications, iso-surface is the primary method for visualizing the structure of 3D density maps. We consider a common scenario where the user views the iso-surfaces from a distance and varies the level associated with the iso-surface as well as the view direction to gain a sense of the general 3D structure of the density map. For many types of density data, the iso-surfaces associated with a particular threshold may be nested and never visible during this type of viewing. In this paper, we discuss a simple, conservative culling method that avoids the generation of interior portions of iso-surfaces at the contouring stage. Unlike existing methods that perform culling based on the current view direction, our culling is performed once for all views and requires no additional computation as the view changes. By pre-computing a single visibility map, culling is done at any iso-value with little overhead in contouring. We demonstrate the effectiveness of the algorithm on a range of bio-medical data and discuss a practical application in online visualization.