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Research and Implementation of Key Technologies in Real-time Three-dimensional Roaming System

Author: YangBingXiang
Tutor: QuanYiNing
School: Xi'an University of Electronic Science and Technology
Course: Applied Computer Technology
Keywords: Real-time three-dimensional roaming 3DS model Visibility culling Collision Detection
CLC: TP391.41
Type: Master's thesis
Year: 2009
Downloads: 77
Quote: 1
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Abstract


Real-time three-dimensional virtual reality roaming is an important field of research , and its immersive , interactive and real-time aspects of the combined effect of the advantages of conventional planar renderings and animation technology can not match . Currently , real-time three-dimensional roaming technology for its unique advantages are widely used in military , entertainment , medical , geographic information systems and other fields. This paper aims to study real-time three-dimensional roaming technology key technologies , such as modeling , scene organization , visibility culling , collision detection, and to achieve a real-time three-dimensional roaming prototype system . The main contents include : ( 1 ) study the commonly used modeling techniques and compare their advantages and disadvantages . Organization of indoor and outdoor scenes were compared and highlights the BSP tree -based indoor scenes organized. This paper describes the use of the BSP tree scene based organization , leads to avoidance and evasion triangular object segmentation segmentation of the BSP tree construction algorithm , leaves child node objects stored on the visibility of the crop and for the first stage of the bounding sphere -based collision detection . ( 2 ) discuss the common visibility culling algorithms, including cone crop, cut back , cover cropping , etc., is given based on the rapid improvement of the BSP tree cones clipping algorithm . According to BSP tree object information stored in the object -level visibility on a rough cut, computation speed, can effectively reduce the number of objects that need to be drawn , and the use of modern graphics hardware, hardware acceleration to improve rendering speed . ( 3 ) study the basic principles of collision detection is proposed based on space technology segmentation and surrounded by a double ball collision detection algorithm. BSP tree to determine by looking for a minimal space where Shi Dian . First phase detection viewpoint with the positional relationship between the object collision rough positioning , which can then be carried out on the possible collision object triangular facets based collision detection , improved collision detection speed. Three-dimensional modeling tool 3DMAX created a laboratory model , using VC 2005 and Direct3D technology to develop a real-time three-dimensional roaming demonstration system to verify the proposed visibility culling algorithms and collision detection algorithm.

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