基于信息熵的分块地表模型无缝绘制方法

设计一种视点相关的地形分块调度处理框架,针对大规模分块地形的实时载入和渲染时不同层次细节之间的缝隙,提出一种基于信息熵的实时缝隙填充方法,将三维场景绘制结果转换到图像空间,根据地形之间的缝隙与周围纹理的差异定位缝隙,通过在全局范围内使用确定的邻域搜索最佳匹配像素对缝隙中的每个像素进行填充;在填充时使用纹理颜色信息熵筛选需要检索的像素以降低计算量,并结合GPU图形硬件对算法进行加速。实验表明,该方法能够对大规模的地形进行实时漫游同时对分块间的缝隙进行平滑填充。

Entropy-based Seamless Chunked Terrain Rendering

We designed a view-dependent chunked terrain scheduling framework, and proposed an entropy-based method to fill the gap, which caused by different terrain LOD (Level of Detail) when the large-scale chunked terrain was loading and rendering. The method converted the 3D scene rendering result into image space, and distinguished the gap by the different texture color characteristic around the gap, then traversed the whole image space to find a best match using a fixed neighborhood, and confirmed the pixel"s color in the gap according the best match. During the traversal process, the texture color entropy was used as weight to filter pixels that had low possibility to become a candidate best match pixel to reduce the computational complexity, and GPU (Graphic Processing Unit) was also used to accelerate the computation. The experimental results illustrate that the method fills the gap smoothly when the user walkthrough the large-scale chunked terrain scene in real-time.