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     Title, abstract, keywords:   Author:
     Geo-information Science , Pages 8-13
 

Research on Dispatch of Dynamic Scene in Large Scope Outdoor Environment
HU Bin, JIANG Nan, ZOU Zhiqiang et al

 中国科学院南京地理与湖泊研究所,南京 210008; 2  中国科学院研究生院,北京 100039;3 南京邮电大学,南京 210008; 4 南京大学,南京 210093 

Abstract

This paper analyzes traditional streaming-based method and discusses the advantages and disadvantages of octree scene organization. And then the paper introduces loose octree into dynamic scene organization and puts forward the concept of data dispatching pipeline. In addition, according to this concept, the corresponding method of dynamic dispatching based on coarse-granular pages and fine-granular tiles is put forward. It is a real-time dispatching method based on out-of-core terrain which uses coarse-granular pages to organize terrain and fine-granular tiles to embroider terrain, so it avoids reading from out-of-core terrain frequently and realizes delicate dispatch for the data of large scope terrain scene. There are some advantages of our method as following: by analyzing the dispatching process into each stage and frame of pipeline, it decreases the “explosive mode” memory and I/O request and ensuring stationarity; by making use of stages of data dispatching pipeline to manage the life cycle of page and tile, it avoids unnecessary costs of state transferring of page and tile; and by using memory pool to manage the allocation and recycle of memory, it has higher utilization efficiency to memory.
Keywords: loose octree; dynamic scene; page; tile; dispatching pipeline

Corresponding Author Contact Information Corresponding author email:hb_hubin@126.com


2007 Institute of Geographic Sciences and Natural Resources Research, CAS.