Hierarchical surface fragments  

作　　者：HUA Wei , BAO Hujun and PENG Qunsheng(State Key Laboratory of CAD & CG, Zhejiang University, Hangzhou 310027, China) 

出　　处：《Progress in Natural Science:Materials International》2002年第9期701-709,共9页自然科学进展·国际材料（英文版）

基　　金：Supported by the National Natural Science Funds for Distinguished Young Scholars (No. 69925204); for Creative Research Groups (No. 60021201); National 863 High-Tech Program (2001AA135040)

摘　　要：A new compact level-of-detail representation, called hierarchical surface fragments, for geometric objects with highly complex shape is presented. The representation comprises a set of irregular unstructured sampled surface fragments, whose boundary is a circle viewed along its normal. An efficient algorithm to construct the representation is described. In depiction of the framework for visualization, a screen tile technique for acceleration of rendering is proposed. Since an approximate z-buffer algorithm is adopted to fast determine visibility of each rendering primitive, a new buffer, z-delta-buffer, is designed to facilitate solving the problems raised by the approximation and to improve the image fidelity. Finally, a solution is provided to integrate our rendering approach for hierarchical surface fragments with traditional polygon-based methods.A new compact level-of-detail representation, called hierarchical surface fragments, for geometric objects with highly complex shape is presented. The representation comprises a set of irregular unstructured sampled surface fragments, whose boundary is a circle viewed along its normal. An efficient algorithm to construct the representation is described. In depiction of the framework for visualization, a screen tile technique for acceleration of rendering is proposed. Since an approximate z-buffer algorithm is adopted to fast determine visibility of each rendering primitive, a new buffer, z-delta-buffer, is designed to facilitate solving the problems raised by the approximation and to improve the image fidelity. Finally, a solution is provided to integrate our rendering approach for hierarchical surface fragments with traditional polygon-based methods.

关 键 词：RENDERING systems  LEVEL of detail  antialiasing  IMAGE-BASED rendering. 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术]