摘要
针对目前沉浸式虚拟现实相关工作通常是基于局部环境构建的,在全球大范围场景方面仍存在空白和不足的问题,提出一种面向沉浸式虚拟现实的数字地球交互漫游方法.首先,确立以观察者为中心的视点控制基本范式;其次,推导设备坐标系与大地坐标系、空间直角坐标系之间的2种基本对应关系,将真实世界中人的活动空间连续映射到数字地球中;然后,考虑当前硬件条件,提出一种综合使用头盔和手柄进行全球范围漫游浏览的方法,能够对观察方向、移动方向、移动速度进行灵活且准确的控制,并符合人在真实世界的经验和直觉;最后,融合地表影像、高程、高精度倾斜模型数据构建多尺度数字地球场景,设计多种类型漫游任务进行实验,通过完成度、耗费时间、视线偏角等指标,评估漫游方法的有效性、合理性和舒适度.实验结果表明,该方法能够有效地支撑用户在全球虚拟环境中的漫游浏览,可以更自然、高效地完成多种类型的漫游任务,为后续全球范围沉浸式虚拟现实相关工作提供基础.
Considering most existing work on immersive virtual reality is based on local environment,and there are still gaps and deficiencies when it comes to global-wide scenes,an interactive exploration method for digital earth is proposed aiming at the usages in immersive virtual reality.Firstly,by discussing the basic paradigms for viewpoint resolving,the observer-centered principle is established.Secondly,2 kinds of corresponding relations among device coordinate system,geodetic coordinate system and spatial Cartesian coordinate system are derived,which can map the activity space in real world into digital earth properly.Thirdly,considering current hardware,an earth exploring method with head mounted display and controllers is developed,which can precisely manipulate the heading direction,moving direction and moving speed,meanwhile is intuitive and easy to use.Finally,the effectiveness,rationality and comfort of exploring method is evaluated by completeness,time consuming,drift angle of sight and other indexes in various types of tasks,with a multi-scale digital earth environment constructed by combining terrain images,elevation,and high-precision 3D model of oblique photogrammetry.Experiments show that the proposed method can let users travel and observe in digital earth,and complete various kinds of exploring tasks in a more natural,flexible and immersive way,which can support further research about immersive virtual reality in global-scale environment.
作者
谭力恒
蒋秉川
李锋
魏然
Tan Liheng;Jiang Bingchuan;Li Feng;Wei Ran(Institute of Geospatial Information,Strategic Support Force Information Engineering University,Zhengzhou 450000)
出处
《计算机辅助设计与图形学学报》
EI
CSCD
北大核心
2023年第4期575-588,共14页
Journal of Computer-Aided Design & Computer Graphics
基金
国家自然科学基金(41901334)。
关键词
沉浸式虚拟现实
数字地球
三维漫游
人机交互
immersive virtual reality
digital earth
interactive exploration
human-computer interaction
