共查询到18条相似文献,搜索用时 78 毫秒
1.
使用WebGL技术和Oak3D引擎对三维地球进行了模拟。该模型与平台无关,简便高效,使用简单,具有良好的Web交互性,不需要任何浏览器插件支持,对互联网时代的3D可视化实现具有一定的参考价值。 相似文献
2.
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。 相似文献
3.
利用计算机可视化图形技术,在实现井眼轨迹三维可视化的基础上,结合图形学原理和Java3D技术对井眼轨迹拾取点的坐标进行三维几何变换的研究与实现。 相似文献
4.
一种Web3D虚拟现实系统的场景数据调度方法 总被引:1,自引:0,他引:1
Web3D虚拟现实技术是随着互联网与虚拟现实技术的发展而产生的,其目的在于在互联网上建立三维的虚拟世界。本文实现了一种Web3D虚拟现实系统的网络结构设计,并提出了一种虚拟场景数据的优化和调度方法。 相似文献
5.
6.
随着数字城市的建设与发展,人们对城市中建筑物的研究逐渐从二维走向三维,从室外走向室内。本文面向室内三维场景可视化的需求,首先,对建筑构件的几何造型信息进行了分析,并使用参数化的方法对其进行组织;然后,基于WebGL技术和Three.js框架,在web端实现了建筑物室内三维模型的重建;最后通过实验验证了该方法的可行性。 相似文献
7.
8.
交互式三维课件能够激发学生的学习兴趣,带给学生真实的感受,同时也适于学生自学和远程教育。针对教学中的实际情况,使用X3D设计交互式三维课件。介绍了X3D的概况,分析了用X3D进行设计的关键技术和设计过程。 相似文献
9.
《内蒙古科技与经济》2017,(6)
基于EyesMap平板扫描系统获取的3D图像数据,自动提取点云数据,并进行点云建模。对点云数据进行选择性切片,得到建筑物的轮廓线。同时,用实例介绍了整体方法的实现过程和效果。实践效果表明,利用平板扫描系统获取的点云数据,可以快速建立结构复杂、不规则的场景的三维可视化模型,相比较传统的三维激光扫描仪获取的海量点云数据及后期复杂繁琐的处理工作,平板扫描仪只需获取较少点云数据,且能利用系统的点云处理软件做到实时处理的能力,这样可以节省大量的时间和工作量。这种能力是现行的三维激光扫描仪所不能比拟的。 相似文献
10.
11.
应用Web3D引擎开发的计算机仿真系统或虚拟现实系统均需在Web浏览器上运行,需要其能快速下载和运行,并且尽量不需下载特定插件。采用基于JAVA技术的开源Web3D引擎开发的三维系统可以满足上述要求,开发的展示系统可以实现三维图形的旋转、缩放等交互功能。此外,在系统开发过程中对引擎中不完善的部分进行了必要的修正。 相似文献
12.
13.
Suchitra Surve Shahina Begum Beena Joshi M. Ikram Khatkhatay Seema Kadam Sanjay Chauhan 《Indian journal of clinical biochemistry : IJCB》2021,36(2):167
Despite ample sunshine, 50–90% Indian children have Vitamin D deficiency (VDD). This enigma of widespread VDD needs exploration especially among under-fives as physiological variations in Vitamin D Binding Protein (VDBP) levels could be potential confounders in the interpretation of total 25-hydroxyvitamin D [25(OH)D]. However, there is scarce information about relevance of VDBP levels in under-five age group. We therefore, explored association of VDBP levels among 1–5 year old children with VDD. Serum levels of 25(OH)D, VDBP, calcium, parathyroid hormone (PTH) and alkaline phosphatase were estimated in 210 apparently healthy children in the age group of 1–5 years. VDD was defined as serum 25(OH)D levels < 20 ng/ml as per the IOM classification. VDBP levels were classified as low if levels were < 168 μg/ml as per the kit. The prevalence of VDD was 79.5% (n = 167) and VDBP levels were low in 48.6% (n = 102) of children. 25(OH)D levels correlated positively with VDBP (r = 0.298, p = 0.0001). A significant number of children (52.7%) with VDD had low VDBP (p = 0.015). and despite adequate sun exposure, 43% of children showed VDD and 56.6% had low VDPB levels. The low VDBP levels largely explain low 25OHD levels without necessarily implying VDD. It may add a new dimension for better understanding of widespread VDD among under-five children. It thus, points towards the need for redefining cut offs and complete evaluation of vitamin D status among under-fives including VDBP. 相似文献
14.
本文根据显示器行业的需求与现状,结合互联网三维技术、虚拟现实以及网络数据库等技术,开发了一个基于网络的显示器展示系统。实践证明,通过本系统,企业可以了解用户的产品需求信息,满足用户的个性化定制需求:用户可以通过简单的键盘和鼠标交互操作,全面了解显示器的各项信息,在虚拟现实环境中动态地感受可视化的产品设计效果。 相似文献
15.
本文阐述了Civil 3D及Map 3D在山区厂址选择工作中的优势,并结合工程实例,介绍了Civil 3D及Map 3D在厂址选择中的主要工作流程。 相似文献
16.
《Information processing & management》2023,60(4):103372
The unsupervised 3D model retrieval is designed to joint the information of well-labeled 2D domain and unlabeled 3D domain to learn collaborative representations. Most existing methods adopted semantic alignment, but were inevitably affected by false pseudo-label. In this paper, we design a novel Instance-Prototype Similarity Consistency Network (IPSC) to guide domain alignment with similarity consistency, which can simultaneously suppress the impact of false pseudo-label information and well reduce the domain discrepancy. IPSC contains two similarity strategies, named Single instance vs Multiple prototypes and Instance-pair vs Single prototype. The first strategy utilizes a single instance as an anchor, and measures the similarities between the anchor and multiple prototypes with the same category but from different domains. The minimization between these similarities can better align the cross-domain prototypes with Kullback–Leibler (KL) divergence than traditional Euclidean similarities. The second strategy utilizes a single prototype as an anchor, and measures the similarities between this anchor and an instance-pair with the same category but from different domains. The minimization between these similarities can conduct the instance-level alignment with KL divergence, which can better suppress the negative effect of noisy pseudo-labels. We conduct various experiments on two datasets, MI3DOR-1 (21000 2D images and 7690 3D models) and MI3DOR-2 (19694 2D images and 3982 3D models), to verify the superiority of our algorithm. 相似文献
17.