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    National Tsing Hua University Institutional Repository > 電機資訊學院 > 資訊工程學系 > 會議論文  >  Level-of-detail representation of bidirectional texture functions for real-time rendering

    Please use this identifier to cite or link to this item: http://nthur.lib.nthu.edu.tw/dspace/handle/987654321/67506

    Title: Level-of-detail representation of bidirectional texture functions for real-time rendering
    Authors: Ma,Wan-Chun;Chao,Sung-Hsiang;Tseng,Yu-Ting;Chuang,Yung-Yu;Chang,Chun-Fa;Chen,Bing-Yu;Ouhyoung,Ming
    教師: 張鈞法
    Date: 2005
    Publisher: Association for Computing Machinery
    Relation: Symposium on Interactive 3D Graphics,Proceedings of the 2005 symposium on Interactive 3D graphics and games,Pages 187 - 194,2005
    Keywords: levels of detail
    bidirectional texture function
    real-time rendering
    Abstract: This paper presents a new technique for rendering bidirectional texture functions (BTFs) at different levels of detail (LODs). Our method first decomposes each BTF image into multiple subbands with a Laplacian pyramid. Each vector of Laplacian coefficients of a texel at the same level is regarded as a Laplacian bidirectional reflectance distribution function (BRDF). These vectors are then further compressed by applying principal components analysis (PCA). At the rendering stage, the LOD parameter for each pixel is calculated according to the distance from the viewpoint to the surface. Our rendering algorithm uses this parameter to determine how many levels of BTF Laplacian pyramid are required for rendering. Under the same sampling resolution, a BTF gradually transits to a BRDF as the camera moves away from the surface. Our method precomputes this transition and uses it for multiresolution BTF rendering. Our Laplacian pyramid representation allows real-time anti-aliased rendering of BTFs using graphics hardware. In addition to provide visually satisfactory multiresolution rendering for BTFs, our method has a comparable compression rate to the available single-resolution BTF compression techniques.
    URI: http://doi.acm.org/10.1145/1053427.1053458
    Appears in Collections:[資訊工程學系] 會議論文

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