| 辐射度场景中双向纹理函数表面的绘制 |
| |
| 引用本文： | 吴向阳,Peng Qunsheng.辐射度场景中双向纹理函数表面的绘制[J].计算机辅助设计与图形学学报,2008,20(8). |
| |
| 作者姓名： | 吴向阳 Peng Qunsheng |
| |
| 作者单位： | 杭州电子科技大学图形图像研究所,杭州,310018 |
| |
| 基金项目： | 浙江省自然科学基金，浙江省教育厅资助项目 |
| |
| 摘 要： | 双向纹理函数(BTF)表面一般采用点采样数据来定义表面的光照属性,因而这类表面很难运用基于面片分割的辐射度方法进行绘制,提出一种将辐射度算法扩展到包括BTF表面场景的有效方法.对表面的BTF样本区域首先进行像素聚类,再在各个像素类内对视线采样方向做进一步自适应的聚类,在各个视线类内像素分别拟合一个低频光照甬数,并求它们在各个视线类内光照细节的高频光照函数.低频光照函数作为该表面区域的平均反射属性参与辐射度计算,生成场景的整体光照效果;然后利用计算的辐射度值和高频光照函数重建该表面区域的BTF材质细节.文中方法不仅取得了较高的压缩效率,而且在BTF材质表面产生了辉映等全局光照效果.最后利用硬件实现了视点快速改变时的场景绘制.
|
| 关 键 词： | 双向纹理函数 辐射度 压缩 |
Rendering Surfaces with Bidirectional Texture Function by Radiosity Method |
| |
| Wu Xiangyang,Peng Qunsheng.Rendering Surfaces with Bidirectional Texture Function by Radiosity Method[J].Journal of Computer-Aided Design & Computer Graphics,2008,20(8). |
| |
| Authors: | Wu Xiangyang Peng Qunsheng |
| |
| Affiliation: | Wu Xiangyang1)Peng Qunsheng2)1)(Institute of Graphics , Image,Hangzhou Dianzi University,Hangzhou 310018)2)(State Key Laboratory of CAD & CG,Zhejiang University,Hangzhou 310058) |
| |
| Abstract: | Surfaces with bidirectional texture function(BTF)is rarely rendered by radiosity method,because their materials are normally defined by point based sampling,which does not adapt to the conventional patch-based process of radiosity approach.An efficient algorithm for integrating BTF surfaces into the framework of radiosity is presented.For a BTF sample set,a clustering process is first applied to all pixels according to their intensity divergences.Then in each pixel cluster,all the viewing directions with si... |
| |
| Keywords: | GPU |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ |
|
