虚拟地形场景绘制中的实时LoD算法

The Real-time LoD Algorithm for Rendering the Virtual Terrain Scene

本文论述了基于视点的连续 L o D算法在动态虚拟地形场景绘制中的应用。我们通过分析规则格网数字高程模型的规律性 ,推导了 3个与视点相关的判据来动态简化地形 :1图像空间误差 ;2视锥台相交性 ;3节点方向性。实验结果证明 ,该算法在基本保持视觉效果不变的情况下 ,极大地提高了虚拟地形场景的绘制速度。

In order to render the virtual terrain scene in real time ,we present a view dependent continuous LoD algorithm in this paper. We analyze the regularity of the regular grid Digital Elevation Model and employ three view dependent criterion to reduce the complexity of the terrain in real time: ① screen space error; ② view frustum intersection; ③ node orientation. The experiment results indicate that this scheme may attain a much higher frame rate in rendering the virtual terrain scene, as well as maintain the visual quality.