Improvement of View Frustum Culling Quality in 3D Terrain Rendering
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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.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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