共查询到20条相似文献，搜索用时 62 毫秒
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碰撞检测是虚拟现实的重要组成部分,快速精确的碰撞检测算法直接决定三维仿真效果的好坏。提出了二维平面碰撞检测与动态八叉树相结合的新算法,使得碰撞检测效率有了很大提高。 相似文献
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三维虚拟博物馆是通过计算机对现实生活中博物馆的一个模拟,在各大主流浏览器上提供虚拟博物馆漫游功能,让广大用户不必亲临现场就可以在网上身临其境地了解博物馆藏品信息。在分析虚拟博物馆实际应用的基础上,针对虚拟场景中的碰撞检测,提出了一种基于WebGL的适用于虚拟博物馆的碰撞检测算法。算法首先使用XML构建虚拟场景,并通过树的筛选方式对空间进行筛选,然后使用优化的AABB包围盒进行碰撞检测,使用户在使用第一人称漫游博物馆场景时,能与静态物品产生真实的碰撞效果。实验结果表明,该算法的运用可以实时反映连续碰撞效果。 相似文献
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针对采样运动规划算法效率低,尤其在处理高维空间和复杂障碍环境等问题时,严重依赖于所选采样参数和碰撞检测距离等,提出了一种自适应双向快速密集树（ABiRDT）避碰运动规划方法。首先,深入研究了ABiRDT算法的基础理论和实现方法,可适应调整碰撞检测距离参数和随机采样扩展步长;其次,重点研究了本算法所采用的c-空间加权均匀采样、最近邻位形查找和基于混合包围盒的并行离散碰撞检测等关键自适应策略;最后,通过三维可视化计算机仿真验证了本文提出算法的有效性。 相似文献
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k-dops算法在虚拟手术中的应用 总被引：1，自引：0，他引：1
提出了k-dops的碰撞检测算法,这种方法能有效地提高碰撞检测的速度,而且能及时更新软组织拓扑结构的变化,能较好解决手术仿真中的碰撞检测问题. 相似文献
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对虚拟校园漫游系统中的碰撞检测进行了研究和探索。介绍了漫游系统中碰撞检测的概念和算法;在基于视点的手动漫游和自动漫游虚拟环境场景中,通过Vega软件平台,实现了与地形和与建筑物墙面两种方式的碰撞检测,增强了虚拟场景漫游的真实感和逼真感。研究成果对数字化校园建设有重要的意义。 相似文献
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碰撞检测在机器人运动规划、虚拟环境、分布交互仿真中都起着重要作用．随着虚拟环境的几何复杂性及现代CPU并行处理能力的增加。为实现快速精确的碰撞检测,并行技术开始广泛地应用于碰撞检测算法中．本文介绍基于并行技术的碰撞检测算法,并着重对已使用的各种并行技术进行了分析比较． 相似文献
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赌轮盘算法是一种常见的随机选择算法,在计算机模拟随机过程中有广泛的应用。文章提出了赌轮盘算法的两种实现方式,并且对两种算法的结果进行了分析比较。实验结果表明,采用固定轮盘,随机掷骰子的算法适合多次重复实验;而随机选择轮盘,固定骰子的方式适合重复次数较少的实验。 相似文献
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邱崇丙 《唐山师范学院学报》2014,(1):21-23
汉字的六书,《说文》对“转注”一类,语焉不详。后世学者提及转注,也仅限于许慎所举出的例字。《汉字例说》一文,作者从转注的角度综合考虑,对部分现代常用字作了分析,跟传统的解释有所不同。希望能抛砖引玉,互相切磋,以推进学术研究。 相似文献
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《海外英语》2007,(5):10-11
Many college freshmen arrive woefully unprepared to do college work, and as disadvantaged populations continue to grow, the share of the American work force that has made it through college is expected to plummet. Many experts blame that educational failure not just on high schools but also on colleges. School & College, a special report by The Chronicle, looks at efforts to fix the system. What reforms would better prepare students for college? What should schools and colleges be doing differently? How should state and federal officials help? 相似文献
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Rachel Zupek 《海外英语》2007,(11):40-41
我们绝大部分人都同意一件事情——我们喜欢金钱。但是你对金钱的喜欢之情足够到让你创立一份事业么?.财富通常被人忽视,主要在于人们不能真正了 相似文献
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《海外英语》2007,(4):36
There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love. 相似文献
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YANGShiguo 《重庆大学学报(英文版)》2004,3(1):86-88
The problem on the geometrc inequalities involving an n-dimensional simplex and its inscribed simplex is studied. Aninequality is established, which reveals that the difference between the squared circumradius of the n-dimensional simplex andthe squared distance between its circumcenter and barycenter times the squared circumradius of its inscribed simplex is not lessthan the 2(n-1)th power of n times its squared inradius, and is equal to when the simplex is regular and its inscribed siplex is atangent point one. Deduction from this inequality reaches a generalization of n-dimensional Euler inequality indicating that thecircumradius of the simplex is not less than the n-fold inradius. Another inequality is derived to present the relationship betweenthe circumradius of the n-dimensional simplex and the circumradius and inradius of its pedal simplex. 相似文献
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Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject. 相似文献
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GUO Bao-feng Xiao Da-wei 《重庆大学学报(英文版)》2005,4(3):129-133
Using virtual reality for interactive design gives a designer an intuitive vision of a design and allows the designer to achieve a viable, optimal solution in a timely manner. The article discusses the process of making the Virtual Reality System of the Humble Administrator＇s Garden. Translating building data to the Virtual Reality Modeling Language （VRML） is by far unsatisfactory. This creates a challenge for computer designers to do optimization to meet requirements. Five different approaches to optimize models have been presented in this paper. The other methods are to optimize VRML and to reduce the file size. This is done by keeping polygon counts to a minimum and by applying such techniques as object culling and level-ofdetail switching. 相似文献