基于参数空间的混合多分辨率绘制

根据点和多边形在表示和绘制物体上各自不同的特点,提出了一种有效绘制细节高度复杂物体的多分辨率方法.3D表面被映射到参数平面,经规则采样成为几何图像,P-Quadtrees是基于几何图像建立的四叉树多分辨率层次结构.通过对四叉树的遍历,面向视点的表面用较大多边形面片绘制,光照细节通过法向映射完成;轮廓部分通过视点相关的LOD(level of detail)控制进行细化,使用点来绘制物体复杂精细的轮廓.通过此方法,细节复杂模型的绘制不仅可以被硬件加速,而且无论在表面还是在轮廓部分都能获得很好的视觉效果.

Parameter Space Based Multiresolution Structure for Hybrid Rendering

In this paper, a novel hybrid multiresolution approach is proposed to efficiently render highly detailed objects based on the respective merits of point-based and polygon-based rendering. Both point and polygon are tightly integrated into the uniform structure of P-Quadtrees, which are constructed from geometry images. While traversing the P-Quadtrees in rendering, the part of surface that faces the viewer can be rendered by coarser quad mesh to reduce the numbers of rendering primitives. The shading details can be enhanced by hardware accelerated normal mapping. The view-dependent LOD (level of detail) selects the finer hierarchy on silhouette, which is rendered by points. The rendering efficiency of large-scale model is greatly improved while the visual effect at both the surfaces and the silhouette is guaranteed.