一种解决全球地形绘制抖动问题的方法

Method of Solving Jitter Problem in Global Terrain Rendering

抖动问题是大规模虚拟场景经常遇到的一个问题,它会导致场景绘制出现非常严重的错误。全球地形环境是一个典型的大场景系统,因此也会遇到抖动问题。针对全球地形环境中的抖动问题,我们改进目前的动态局部坐标系统反抖动方法,提出一种更合适全球地形环境的新反抖动方法。这种方法使用视点在球面上的投影点代替视点作为动态局部坐标系统的原点,使得地形顶点有更高地精度。经过实验证明,这种方法比以视点为原点的反抖动方法有更好地反抖动效果。

Jitter problem leading to serious errors in rendering is common in large-scale virtual environments.Global terrain environment is a typical large-scale environment,therefore it would encounter jitter problem.For this problem,the current methods using dynamic local coordinate system were improved and a new method was proposed,which is more suitable for global terrain environment.This method used the projection point of the viewpoint on the global surface to substitute the viewpoint as the origin of dynamic local coordinate system in order to make the terrain vertices with higher precision.It has been proved that the result of this new method is better than the method using the viewpoint as the origin by an experiment.