Based On The Ogre Terrain System Design And Research

With the improvement of processor speed,advancement of graphics technology and the popularity of the internet,Massively Multiplayer Games(MMP) are becoming one of the most popular ways to spend time and communicate with each other.The technologies of MMP are becoming the hot point of research and development area,and have made a lot of progress over the years.How to organize the scene graph effectively and create endless worlds to hold hundreds and thousands players and let them play together,have already become one of the main research topics for programmers and teams who want to develop MMP.This thesis discusses the evolution of terrain system and its current situation,make an introduction to endless world technology used to organize the scene graph in MMP,and then make a deep analysis to each module.Major contribution of the paper includes,(1)Design and Develop a terrain system based on OGRE,an open source 3D graphics engine.This terrain system does not depend on the details of OGRE and can be easily applied to Game Engines that are independently researched and developed.(2) this terrain system can asynchronously load and unload terrain resources in page and tile unit,without breaking the main process of program.(3) beside viewport culling and LOD,this terrain system introduce the horizon occlusion culling method.By using this method the terrain system will dynamically calculate the horizon line and quickly culling the triangle faces that far beyond below the horizon line. Combining with the traditional culling method,this system shows superior results.Towards the end of this thesis,it discusses the future technology of terrain system design and other important technology features for commercial terrain engine.The research achievement will be used in the commercial game engine developing and MMP developing,it has commercial value.