| 三维地形渲染中视景体剔除效果的改善 |
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| 引用本文： | 张唯.三维地形渲染中视景体剔除效果的改善[J].地球科学,2010,35(3):403-406, 462. |
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| 作者姓名： | 张唯 |
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| 作者单位： | 中国地质大学信息工程学院，湖北武汉 430074 |
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| 基金项目： | 国家重点"863"项目 |
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| 摘 要： | 为提高三维场景的渲染质量，需要根据场景绘制的数据总量以及当前视点观察位置，对视景体外的实体进行消隐处理.在对三维地形渲染特征以及透视投影参数进行分析的基础上，针对以规则格网为原始数据的三维地形场景，建立了透视投影远近裁剪平面与当前场景观察模式之间的对应关系.采用裁剪平面动态设置的方法，在保证三维渲染精度与速度的前提下，有效改善了由固定裁剪平面引起的图形不正常裁切现象，提高了三维地形场景的渲染效果.
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| 关 键 词： | 裁剪平面 视景体剔除 透视投影 地理信息系统 |
| 收稿时间： | 2010-01-15 |
Improvement of View Frustum Culling Quality in 3D Terrain Rendering |
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| ZHANG Wei.Improvement of View Frustum Culling Quality in 3D Terrain Rendering[J].Earth Science-Journal of China University of Geosciences,2010,35(3):403-406, 462. |
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| Authors: | ZHANG Wei |
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| Abstract: | To improve the quality of three-dimensional scene, view frustum culling according to the amount of rendering data and observation positions is needed. Based on the character of three-dimensional terrain scene and the parameters of far-near clip plane in perspective projection, this paper builds a relationship between the far-near clip plane of perspective projection and the observation model for the three-dimensional scene with grid raster terrain data. By using the dynamic setting of far-near clip plane, this method can change the abnormal phenomenon caused by the fixed clip plane. It enhances the quality of three-dimensional rendering and ensures the accuracy and quickening the speed of rendering at the same time. |
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