查询词典 virtual object

Show model combines growth model, math model and VR technologies to design the proper object structure of each organ of virtual plant. First of all,research background, research content of virtual plant area and Virtual Reality technology are introduced. The concept of VR and research content of virtual plant are defined. Secondly, we analyze math model of virtual plant, including Bezier curve, NURBS curved surface, fractal system, L-system and Catenary curve. Thirdly, we give show model of virtual plant in detail. Finally, the design of the platform and growth model on XML script is introduced , and how to show the virtual plant in the platfrom is discussed too.

本文首先介绍了虚拟植物领域的研究背景、研究内容和虚拟现实技术，明确了虚拟现实的概念和虚拟植物的研究范畴，然后介绍了虚拟植物器官的数学模型，对各个器官展开了拓扑结构分析，建立有针对性的数学模型，先后介绍了Bezier曲线，NURBS曲面，分形系统，L-系统和悬链线曲线，接着详细分类介绍了虚拟植物器官的显示模型，最后介绍了虚拟作物平台的设计，平台中基于XML脚本的生长模型，以及虚拟作物在作物平台中的显示。

It is the change that virtual technology gives birth to a great influence on the human's cognitive activities. First of all, virtual technology has caused obvious change of cognitive relation between subject and object, which includes the change of interaction between subject and object, digitization of cognitive resonance and scene of cognitive model, etc. secondly, virtual technology has improved the subject's cognitive ability and level: the ability of esthesia of the subject has been strengthened, the change of the cognitive structure and the way to obtain information of the subject has been caused and the regulation and control ability of the subject has been improved by virtual technology.

正是这种转向使得虚拟技术对于人类的认识活动产生了重大影响：首先，虚拟技术导致了主客体之间的认识关系发生明显的变化，主要包括主客体作用的方式的变化、认识中介的数字化以及认知模型的情景化等；虚拟技术提高了主体认识能力和水平：虚拟技术增强了主体的感知能力，引起了主体认识结构的变化，认识主体获取信息的方式发生了变革，提高了主体对认识活动的调控能力，张扬了主体在认识活动中的能动性与创造性；虚拟技术拓展了主体的认识领域，即它扩展了主体的认识空间、丰富了主体的认识来源。

It is the change that virtual technology gives birth to a great influence on the human's cognitive activities. First of all, virtual technology has caused obvious change of cognitive relation between subject and object, which includes the change of interaction between subject and object, digitization of cognitive resonance and scene of cognitive model, etc. secondly, virtual technology has improved the subject's cognitive ability and level: the ability of esthesia of the subject has been strengthened, the change of the cognitive structure and the way to obtain information of the subject has been caused and the regulation and control ability of the subject has been improved by virtual technology. Initiative and creativity has been highlighted in the cognitive activity. Lastly, virtual technology has expanded subject's cognitive field, that is to say it has expanded the cognitive space of the subject, and enriched the cognitive source of the subject The appearance of virtual technology leads to great changes of mankind's practices.

正是这种转向使得虚拟技术对于人类的认识活动产生了重大影响：首先，虚拟技术导致了主客体之间的认识关系发生明显的变化，主要包括主客体作用的方式的变化、认识中介的数字化以及认知模型的情景化等；虚拟技术提高了主体认识能力和水平：虚拟技术增强了主体的感知能力，引起了主体认识结构的变化，认识主体获取信息的方式发生了变革，提高了主体对认识活动的调控能力，张扬了主体在认识活动中的能动性与创造性；虚拟技术拓展了主体的认识领域，即它扩展了主体的认识空间、丰富了主体的认识来源。

This thesis started from the researching background and purposes of the communication management of Virtual Project Team, using the five processes of classic project communication management as the researching object, and then to explanatorily studied on the communication management problems of Virtual Project Team by the application of theory deduction method and case study method.

本文从虚拟项目团队沟通管理的研究背景和研究意义入手，以项目沟通管理的五个过程作为研究对象，运用理论演绎和案例分析的方法对虚拟项目团队的沟通管理问题进行探讨性研究。

It's also important that you understand how the virtual function table works, so you understand the extra steps that can decrease performance that take place when you call a virtual function (each object has a virtual function table pointer hidden from you in its structure data , and to call a virtual function, you need to follow that pointer to the table, and then jump to the function pointer contained within, which can hurt caching).

理解虚函数表是如何工作的也同样重要，这样你就能够理解当你调用虚函数时需要的额外步骤，这些步骤会降低性能(每个对象都有一个隐藏的虚函数表指针，这样调用一个虚函数，你需要根据这个指针找到那个函数表，然后跳到它所包含的函数指针所指的函数里，这会降低cache的效果)。

Taking bearing virtual prototype as an object, model transformation and product demonstration of virtual product were studied in this paper.

本文以某轴承虚拟样机为例，从模型转换，以及产品演示的角度进行了研究。

We can adjust the parameters of virtual camera to ensure consistency of the virtual scene and the real foreground; add live video components over object user sele...

进一步，我们根据VRML的实际特点，提出并实现了特定物体场景动画，虚拟场景交互，这些图形特级效果大大丰富了我们虚拟演播室的功能。

It has carried out a physical experiment building and a virtual laboratory of electromagnetic induction based on VRML, using 3D MAX and VRML to make the three dimensional virtual test equipment, and produces the strategy which could optimize the VRML document, unify VRML and script language JavaScript to realize the object alternately operation in the three dimensional scene ; Using the embed element to insert the virtual experimental file to the HTML documents and realizes the network issue of virtual experimental system, which enables the studier to carry on the browsing study through Internet. And finally this thesis gives an introduction of the test appraisal situation of this virtual experiment.

具体是基于VRML实现了一栋物理实验大楼及一个电磁感应虚拟实验室，利用3D MAX、VRML进行三维虚拟实验设备的构建，并给出了优化VRML文件的策略，结合VRML和脚本语言JavaScript实现三维场景中模型对象的交互操作，使用embed元素将虚拟实验文件嵌入到HTML文档中实现虚拟实验系统的网络发布，使学习者能通过Internet进行浏览学习，最后介绍了该虚拟实验系统的试用评价情况。

According to the function of distributed emulator, optical information processing and image multi-object tracking system, the following three aspects were emphasized in this dissertation. Firstly, a vast virtual terrain, ground radar models and canyons were created for the distributed emulator with modeling software Creator. The radars were driven to scan during emulating and the real time terrain code was sent to Radar module. Secondly, an optics channel simulating the optics camera of a virtual aircraft was implemented with simulating software Vega. The 2-D information got from the channel was translated and sent to multi-sensor information fusion system as an optics information source. Thirdly, the dissertation studied some motion estimation methods and analyzed the factors which influence the speed and the precision of the block matching algorithms. Then an improved block matching method was proposed for image multi-object tracking system and applied in the system combined with frame difference method.

论文根据多传感信息融合实验系统中的分布式飞行仿真系统、光学信号处理器和图像多目标跟踪系统三个子系统的功能要求，具体完成了以下三方面的工作：首先利用建模软件Creator创建分布式飞行仿真系统中的大面积地形、场景中的地面雷达模型和峡谷地形，并在仿真过程中实时驱动雷达模型的扫描，同时为后续雷达仿真模块提供实时地形编码；其次利用仿真软件Vega，在分布式仿真系统中为光学信号处理器设计实现了光学通道，模拟飞行器的光学摄像机的功能，并且对由此通道获得的目标二维光学信息进行转化处理，作为光学信息源发送给后续的多传感信息融合器；最后针对图像多目标跟踪系统，在研究图像分割运动估计算法的基础上，通过分析影响块匹配算法速度和精度的因素，改进了块匹配运动估计算法，结合差分法可应用到目标跟踪系统中。

A reverse measurement system about the data collecting of 2-D object edge based on machine vision is discussed,in order to realize digital data input of the dimensions of 2-D object complex edge. This system realized calibration in large scene by virtual grid calibration method, and advanced the precision of system by using double CCD cameras. It realized data mergence by setting up referencer of regular shape. Some methods were put forward to realize graphics vectorization such as using eight-chain code difference to search for the turning points, and using change-length subjunctive beeline to distinguish linetype. The output data use the general DXF document format to connect the software of CAD. Research indicated that this system can be applied in reverse measurement to the dimensions of 2-D object complex edge.

对机器视觉二维反求测量系统进行了研究，以实现二维复杂平面边缘尺寸的数字化录入；采用虚拟网格技术实现大场景下的测量标定；利用双CCD分区域获取图象，通过设置规则参照物、数据拼接等数据处理提高测量精度；提出了利用8-链码的&链差&确定转折点，用&变长度虚拟直线&判断线型实现图形矢量化的方法；数据输出采用通用的DXF文件格式实现与CAD软件的接口；研究结果表明，该系统能够应用于二维复杂平面边缘的反求测量。

Plunder melds and run with this jewel!

掠夺melds和运行与此宝石！

My dream is to be a crazy growing tree and extend at the edge between the city and the forest.

此刻，也许正是在通往天国的路上，我体验着这白色的晕旋。