Block modeling and segmentally iterative ray tracing in complex 3D media
会议名称：《中国科学院地质与地球物理研究所2006学术年会》
会议日期：2007年
学科分类：081801[工学-矿产普查与勘探] 081802[工学-地球探测与信息技术] 08[工学] 0818[工学-地质资源与地质工程]
摘 要：We propose using a set of blocks to approximate geologically complex media that cannot be well described by layered *** between blocks are triangulated to prevent overlaps or gaps often produced by other techniques,such as B-splines,and to speed up the calculation of intersection points between a ray and block *** also use a smoothing algorithm to make the normal vector of each triangle continuous at the boundary,so that ray tracing can be performed with stability and *** on Fermat’s principle,we perturb an initial raypath between two points,generally obtained by shooting,with a segmentally iterative ray-tracing(SIRT) *** points on a ray are updated in sequence,instead of simultaneously,because the number of new intersection points may be increased or decreased during the iteration *** improve convergence speed,we update the intersection points by a first-order explicit formula instead of traditional iterative *** transmitted and reflected waves are *** tests demonstrate that the combination of block modeling and segmentally iterative ray tracing is effective in implementing kinematic two-point ray tracing in complex 3D media.