基于道路边界alpha-map的真实感道路实时绘制技术

Realistic Real-time Road Rendering Technology Based on Road Boundaryalpha-map

针对传统基于缓冲区机制的道路绘制方法存在的模糊和锯齿问题进行研究,提出基于道路边界alpha-map的真实感道路实时绘制方法。该方法基于规则格网地形模型,通过分析利用缓冲区机制生成的道路模型边界网格的构成及特点,设计道路的边缘表达,并基于此设计3种类型的道路边界alpha-map用以生成具有实际视觉效果的道路边缘。实验表明:该方法能够消除传统方法产生的锯齿和模糊现象,很好的实现道路与地表其它区域的平滑过渡,提高了绘制的真实感。该方法的另一优点在于alpha-map的数量与地形的大小以及道路的长短和宽窄无关。

A method of realistic real-time rendering based on road boundary alpha-map was proposed to eliminate the blur and aliasing issues produced by traditional rendering method based on buffer mechanism. In the method, the road was generated by buffer mechanism based on grid model of terrain, and the road＇s borders were constructed by analyzing the characteristics of road boundary grids. Based on these, three types of road boundary alpha-maps were designed for producing the road borders with realistic visual effects. Experiment shows that the method can improve the rendering realism of the road borders than traditional method. Another advantage of the method is that the number of alpha-map has nothing to do with the terrain size as well as the length and width of road.