Feature-Adaptive Rendering of Loop Subdivision Surfaces on Modern GPUs  

作　　者：黄韵岑 冯结青 Matthias Nie?ner 崔元敏 杨宝光 

机构地区：[1]CCF [2]State Key Laboratory of CAD&CG,Zhejiang University [3]ACM [4]Computer Graphics Laboratory,Stanford University,Stanford,CA 94305,U.S.A. [5]Qualcomm Technologies Incorporation,San Diego,CA 92121,U.S.A.

出　　处：《Journal of Computer Science & Technology》2014年第6期1014-1025,共12页计算机科学技术学报（英文版）

基　　金：supported by the National Natural Science Foundation of China under Grant No.61170138;the Program for New Century Excellent Talents in University of China under Grant No.NCET-10-0728

摘　　要：We present a novel approach for real-time rendering Loop subdivision surfaces on modern graphics hardware. Our algorithm evaluates both positions and normals accurately, thus providing the true Loop subdivision surface. The core idea is to recursively refine irregular patches using a GPU compute kernel. All generated regular patches are then directly evaluated and rendered using tile hardware tessellation unit. Our approach handles triangular control meshes of arbitrary topologies and incorporates common subdivision surface features such as semi-sharp creases and hierarchical edits. While surface rendering is accurate up to machine precision, we also enforce a consistent bitwise evaluation of positions and normals at patch boundaries. This is particularly useful in the context of displacement mapping which strictly requires inatching surface normals. Furthermore, we incorporate efficient level-of-detail rendering where subdivision depth and tessellation density can be adjusted on-the-fly. Overall, our algorithm provides high-quality results at real-time frame rates, thus being ideally suited to interactive rendering applications such as video games or authoring tools.We present a novel approach for real-time rendering Loop subdivision surfaces on modern graphics hardware. Our algorithm evaluates both positions and normals accurately, thus providing the true Loop subdivision surface. The core idea is to recursively refine irregular patches using a GPU compute kernel. All generated regular patches are then directly evaluated and rendered using tile hardware tessellation unit. Our approach handles triangular control meshes of arbitrary topologies and incorporates common subdivision surface features such as semi-sharp creases and hierarchical edits. While surface rendering is accurate up to machine precision, we also enforce a consistent bitwise evaluation of positions and normals at patch boundaries. This is particularly useful in the context of displacement mapping which strictly requires inatching surface normals. Furthermore, we incorporate efficient level-of-detail rendering where subdivision depth and tessellation density can be adjusted on-the-fly. Overall, our algorithm provides high-quality results at real-time frame rates, thus being ideally suited to interactive rendering applications such as video games or authoring tools.

关 键 词：real-time rendering Loop subdivision surface hardware tessellation 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术]