利用BIM(Building Information Modeling)技术进行工程建设的精细化管理需要实现三维BIM模型的在线展示及交互操作.传统的三维图形可视化技术虽然能够实现模型展示,但存在模型文件格式兼容性差,对终端设备硬件要求高,缺少必要的交互功...利用BIM(Building Information Modeling)技术进行工程建设的精细化管理需要实现三维BIM模型的在线展示及交互操作.传统的三维图形可视化技术虽然能够实现模型展示,但存在模型文件格式兼容性差,对终端设备硬件要求高,缺少必要的交互功能等问题.针对这些问题进行系统分析,提出了一套基于云渲染技术的三维BIM模型可视化解决方案.其中包括源模型文件轻量化转换技术,基于HOOPS的图形引擎开发技术,以及基于云渲染的大体量模型浏览器展示和交互技术.通过系统研发实现了主流建模软件Revit、Catia、Microstation、Tekla模型源文件的轻量化转换,以及基于云渲染的图形引擎系统,并在北京至张家口铁路工程建设项目中进行了验证.展开更多
In this study,a 3D virtual reality and visualization engine for rendering the ocean,named VV-Ocean,is designed for marine applications.The design goals of VV-Ocean aim at high fidelity simulation of ocean environment,...In this study,a 3D virtual reality and visualization engine for rendering the ocean,named VV-Ocean,is designed for marine applications.The design goals of VV-Ocean aim at high fidelity simulation of ocean environment,visualization of massive and multidimensional marine data,and imitation of marine lives.VV-Ocean is composed of five modules,i.e.memory management module,resources management module,scene management module,rendering process management module and interaction management module.There are three core functions in VV-Ocean:reconstructing vivid virtual ocean scenes,visualizing real data dynamically in real time,imitating and simulating marine lives intuitively.Based on VV-Ocean,we establish a sea-land integration platform which can reproduce drifting and diffusion processes of oil spilling from sea bottom to surface.Environment factors such as ocean current and wind field have been considered in this simulation.On this platform oil spilling process can be abstracted as movements of abundant oil particles.The result shows that oil particles blend with water well and the platform meets the requirement for real-time and interactive rendering.VV-Ocean can be widely used in ocean applications such as demonstrating marine operations,facilitating maritime communications,developing ocean games,reducing marine hazards,forecasting the weather over oceans,serving marine tourism,and so on.Finally,further technological improvements of VV-Ocean are discussed.展开更多
随着三维可视化技术在电网地理信息系统(Geographic Information System,GIS)中的广泛应用,电网三维模型成为除基础地理数据之外电网三维GIS系统承载的又一重要数据。本文设计并实现了针对于电网三维模型简化机制,对各种精细的设备模型...随着三维可视化技术在电网地理信息系统(Geographic Information System,GIS)中的广泛应用,电网三维模型成为除基础地理数据之外电网三维GIS系统承载的又一重要数据。本文设计并实现了针对于电网三维模型简化机制,对各种精细的设备模型,在保持原设备不失真的情况下进行建模的自动裁剪。结合面向对象的模型数据动态调度技术,形成基于批量电网三维模型的渲染引擎,实现电网设备模型的高效渲染。展开更多
采用基于开源三维渲染引擎Open Scene Graph(OSG)平台,利用目标与背景的几何特征模型、红外辐射特征模型、大气辐射传输模型、探测器光电转换模型、探测器噪声模型等,实现了一个参数可调的红外场景仿真系统。它能根据战情及被试装备的...采用基于开源三维渲染引擎Open Scene Graph(OSG)平台,利用目标与背景的几何特征模型、红外辐射特征模型、大气辐射传输模型、探测器光电转换模型、探测器噪声模型等,实现了一个参数可调的红外场景仿真系统。它能根据战情及被试装备的视角方向生成红外侦察告警注入式和辐射式仿真试验所需的红外场景图像。展开更多
文摘利用BIM(Building Information Modeling)技术进行工程建设的精细化管理需要实现三维BIM模型的在线展示及交互操作.传统的三维图形可视化技术虽然能够实现模型展示,但存在模型文件格式兼容性差,对终端设备硬件要求高,缺少必要的交互功能等问题.针对这些问题进行系统分析,提出了一套基于云渲染技术的三维BIM模型可视化解决方案.其中包括源模型文件轻量化转换技术,基于HOOPS的图形引擎开发技术,以及基于云渲染的大体量模型浏览器展示和交互技术.通过系统研发实现了主流建模软件Revit、Catia、Microstation、Tekla模型源文件的轻量化转换,以及基于云渲染的图形引擎系统,并在北京至张家口铁路工程建设项目中进行了验证.
基金supported by the Global Change Research Program of China under Project 2012CB955603the Natural Science Foundation of China under Project 41076115+2 种基金the National Basic Research Program of China under Project 2009CB723903the Public Science and Technology Research Funds of the Ocean under Project 201005019the National High-Tech Research and Development Program of China under Project 2008AA121701
文摘In this study,a 3D virtual reality and visualization engine for rendering the ocean,named VV-Ocean,is designed for marine applications.The design goals of VV-Ocean aim at high fidelity simulation of ocean environment,visualization of massive and multidimensional marine data,and imitation of marine lives.VV-Ocean is composed of five modules,i.e.memory management module,resources management module,scene management module,rendering process management module and interaction management module.There are three core functions in VV-Ocean:reconstructing vivid virtual ocean scenes,visualizing real data dynamically in real time,imitating and simulating marine lives intuitively.Based on VV-Ocean,we establish a sea-land integration platform which can reproduce drifting and diffusion processes of oil spilling from sea bottom to surface.Environment factors such as ocean current and wind field have been considered in this simulation.On this platform oil spilling process can be abstracted as movements of abundant oil particles.The result shows that oil particles blend with water well and the platform meets the requirement for real-time and interactive rendering.VV-Ocean can be widely used in ocean applications such as demonstrating marine operations,facilitating maritime communications,developing ocean games,reducing marine hazards,forecasting the weather over oceans,serving marine tourism,and so on.Finally,further technological improvements of VV-Ocean are discussed.
文摘随着三维可视化技术在电网地理信息系统(Geographic Information System,GIS)中的广泛应用,电网三维模型成为除基础地理数据之外电网三维GIS系统承载的又一重要数据。本文设计并实现了针对于电网三维模型简化机制,对各种精细的设备模型,在保持原设备不失真的情况下进行建模的自动裁剪。结合面向对象的模型数据动态调度技术,形成基于批量电网三维模型的渲染引擎,实现电网设备模型的高效渲染。
文摘采用基于开源三维渲染引擎Open Scene Graph(OSG)平台,利用目标与背景的几何特征模型、红外辐射特征模型、大气辐射传输模型、探测器光电转换模型、探测器噪声模型等,实现了一个参数可调的红外场景仿真系统。它能根据战情及被试装备的视角方向生成红外侦察告警注入式和辐射式仿真试验所需的红外场景图像。
文摘本文研究了移动终端相关软硬件环境以及海量基础地理数据的组织与快速发布、电网三维模型的调度与渲染、矢量及地名数据的分块与渐进式加载等关键技术,利用C++、Open GL ES、移动互联网技术等创建了基于移动终端的三维渲染引擎。利用该引擎提供的SDK开发了移动终端电力三维地理信息系统(Geographic Information System,GIS)基础平台,实现了信息模式共享以及系统数据整合,同时设计并实现了电网业务的实用性功能。
