基于Unity3D的大规模倾斜摄影模型加载策略  

Loading strategy of large-scale oblique photography model based on Unity3D

作　　者：汪光跃 彭杨 张茂军[1] WANG Guangyue;PENG Yang;ZHANG Maojun(College of System Engineering,National University of Defense Technology,Changsha Hunan 410073,China)

机构地区：[1]国防科技大学系统工程学院

出　　处：《计算机应用》2019年第S02期194-198,共5页journal of Computer Applications

基　　金：国家自然科学基金资助项目(61703415,61602494);长沙市科技计划项目(kq1706098)

摘　　要：针对基于倾斜摄影技术生成的高质量三维模型由于数据量大难以加载进Unity3D中实现漫游的问题,提出了大规模三维实景模型在Unity3D中快速加载的方法。首先,采用多细节层次技术生成场景的不同细节层次模型;其次,从中选取高、低两种细节层次三维模型进行分块处理;最后,以整个低细节层次模型为背景根据实时位置信息采用九宫格方式动态加载相应高细节层次模型块,采用协同程序与异步加载的方法解决高细节层次模型块同时加载所引起的画面卡顿。实验结果表明,选用边长划分为46 m的三维模块进行九宫格式动态加载效果最优,同时采用协同程序和异步加载的方法能够有效提升漫游流畅度。所提算法可在Unity3D中实现大规模三维实景模型实时加载并且流畅漫游。Since the high-quality 3D model generated based on oblique photography technology is difficult to be loaded into Unity3D for roaming,a method of fast loading large-scale 3D real scene model in Unity3D was proposed.Firstly,the multiple levels of detail technology was adopted to generate different level of detail models of scenes.Secondly,three-dimensional models on both high and low level of detail were selected for block processing.Finally,the whole models on low level of detail were used as the background,the model blocks on high level of detail were dynamically loaded in the nine-palace mode according to the real-time position information.Coroutines and asynchronous loading methods were used to solve the roaming lag caused by simultaneous loading of high-level-of-detail model blocks.The experimental results show that the dynamic loading of the nine-palace mode is optimal when the three-dimensional module with a side length of 46 meters is selected.Also,the roaming fluency can be effectively improved by coroutines and asynchronous loading methods.The proposed algorithm can realize real-time loading and fluent roaming of large-scale 3D realistic models generated by oblique photography in Unity3D.

关 键 词：模型加载 倾斜摄影 双细节层次 虚拟漫游 三维重建 

分 类 号：TP391.9[自动化与计算机技术—计算机应用技术]