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    Please use this identifier to cite or link to this item: http://asiair.asia.edu.tw/ir/handle/310904400/18851

    Title: Tunable Bounding Volumes for Monte Carlo Applications
    Authors: 蔡淵裕;Tsai, Yuan-Yu
    Contributors: 資訊多媒體應用學系
    Date: 2006
    Issue Date: 2012-11-26 15:09:38 (UTC+8)
    Abstract: Luminaire sampling plays an important role in global illumination
    calculation using Monte Carlo integration. A conventional approach generates
    samples on the surface of the luminaire, resulting in rendered images with high
    variance of noise. In this paper, we present an efficient solid angle sampling
    technique using tunable bounding volumes for global illumination calculation.
    In contrast to the conventional approach, our technique derives samples from
    the solid angle subtended by the luminaire. In the construction process, we
    build a convex, frustum-like polyhedron as a bounding volume for a light
    source. Front-facing polygons of the bounding volume are then projected onto
    the unit hemisphere around the shaded point. These projected polygons represent
    the approximated solid angle subtended by the luminaire. The third step
    samples the projected spherical polygons on which a number of stratified samples
    are generated. We employ various types of light sources including ellipse,
    elliptic cylinder, elliptic cone and elliptic paraboloid. We perform our technique
    for Monte Carlo Direct Lighting and Monte Carlo Path Tracing applications.
    Under similar sample numbers, our technique produces images with less variance
    of noise compared to the conventional method. In addition, our technique
    provides roughly equal image quality in less execution time. Our approach is
    simple, efficient, and applicable to many types of luminaries for global illumination
    Appears in Collections:[行動商務與多媒體應用學系] 期刊論文

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