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View-dependent greenhouse scene modeling and interactive walkthrough

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  • Received:2008-10-06 Revised:1900-01-01 Online:2009-03-01 Published:2009-03-01

视点依赖的温室场景模拟与交互式漫游

魏伟 郭新宇 陆声链   

  1. 国家农业信息化工程技术研究中心 国家农业信息化工程技术研究中心 国家农业信息化工程技术研究中心
  • 通讯作者: 郭新宇

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Abstract: A method for realtime and realistic rendering virtual agricultural scenes that include group of solar greenhouse was proposed in this paper. This method used viewdependent continuous LOD models to reduce the amount of polygons needed to be rendered actually, and a collision detection algorithm was implemented based on bounding box. The rendering speed of the scene was improved by using visibility culling techniques. In the constructed virtual agricultural scenes, large-scale plants stands were created rapidly by using geometric transformation, while shadow volume algorithm was implemented to render shadow in the scene. These significantly improved the realism of virtual agricultural scene. The simulation results demonstrate the proposed method can reduce the number of rendered elements effectively, and improves the rendering speed with high realism. This can meet the needs for realtime and interactive walkthrough in large scale virtual scenes.

Key words: virtual greenhouse, visibility, Level Of Detail (LOD), bounding box, shadow, walkthrough

摘要： 为对包含日光温室的农业场景进行实时、逼真的绘制，采用基于视点的连续细节层次（LOD）来减少实际需要绘制的网格数据量，并基于包围盒技术实现了视点的碰撞检测，同时使用可见性剔除算法来加速场景渲染速度。在渲染温室内植物时，通过几何变换实现了大规模植物群体的快速构建，并在场景中使用阴影体算法来渲染阴影，生成了具有真实感的大规模温室农业场景。模拟结果表明该方法能有效地减少渲染的面元数目，大大提高了绘制速率，场景有较高的真实感，能够满足交互式实时漫游的要求。

关键词: 虚拟温室, 可见性, 细节层次, 包围盒, 阴影, 漫游

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